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 DEFINE_MUTEX(acpi_device_lock);
56 LIST_HEAD(acpi_wakeup_device_list);
58 struct acpi_device_bus_id{
60 unsigned int instance_no;
61 struct list_head node;
65 * Creates hid/cid(s) string needed for modalias and uevent
66 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
67 * char *modalias: "acpi:IBM0001:ACPI0001"
69 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
74 struct acpi_hardware_id *id;
76 if (list_empty(&acpi_dev->pnp.ids))
79 len = snprintf(modalias, size, "acpi:");
82 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
83 count = snprintf(&modalias[len], size, "%s:", id->id);
84 if (count < 0 || count >= size)
95 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
96 struct acpi_device *acpi_dev = to_acpi_device(dev);
99 /* Device has no HID and no CID or string is >1024 */
100 len = create_modalias(acpi_dev, buf, 1024);
106 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
109 * acpi_bus_hot_remove_device: hot-remove a device and its children
110 * @context: struct acpi_eject_event pointer (freed in this func)
112 * Hot-remove a device and its children. This function frees up the
113 * memory space passed by arg context, so that the caller may call
114 * this function asynchronously through acpi_os_hotplug_execute().
116 void acpi_bus_hot_remove_device(void *context)
118 struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
119 struct acpi_device *device;
120 acpi_handle handle = ej_event->handle;
122 struct acpi_object_list arg_list;
123 union acpi_object arg;
124 acpi_status status = AE_OK;
125 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
127 if (acpi_bus_get_device(handle, &device))
133 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
134 "Hot-removing device %s...\n", dev_name(&device->dev)));
136 if (acpi_bus_trim(device, 1)) {
137 printk(KERN_ERR PREFIX
138 "Removing device failed\n");
142 /* device has been freed */
145 /* power off device */
146 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
147 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
148 printk(KERN_WARNING PREFIX
149 "Power-off device failed\n");
151 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
153 arg_list.pointer = &arg;
154 arg.type = ACPI_TYPE_INTEGER;
155 arg.integer.value = 0;
156 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
160 arg_list.pointer = &arg;
161 arg.type = ACPI_TYPE_INTEGER;
162 arg.integer.value = 1;
167 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
168 if (ACPI_FAILURE(status)) {
169 if (status != AE_NOT_FOUND)
170 printk(KERN_WARNING PREFIX
171 "Eject device failed\n");
179 /* Inform firmware the hot-remove operation has completed w/ error */
180 (void) acpi_evaluate_hotplug_ost(handle,
181 ej_event->event, ost_code, NULL);
185 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
188 acpi_eject_store(struct device *d, struct device_attribute *attr,
189 const char *buf, size_t count)
193 acpi_object_type type = 0;
194 struct acpi_device *acpi_device = to_acpi_device(d);
195 struct acpi_eject_event *ej_event;
197 if ((!count) || (buf[0] != '1')) {
201 if (acpi_device->driver == NULL) {
206 status = acpi_get_type(acpi_device->handle, &type);
207 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
212 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
218 ej_event->handle = acpi_device->handle;
219 if (acpi_device->flags.eject_pending) {
220 /* event originated from ACPI eject notification */
221 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
222 acpi_device->flags.eject_pending = 0;
224 /* event originated from user */
225 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
226 (void) acpi_evaluate_hotplug_ost(ej_event->handle,
227 ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
230 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
235 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
238 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
239 struct acpi_device *acpi_dev = to_acpi_device(dev);
241 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
243 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
245 static ssize_t acpi_device_uid_show(struct device *dev,
246 struct device_attribute *attr, char *buf)
248 struct acpi_device *acpi_dev = to_acpi_device(dev);
250 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
252 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
254 static ssize_t acpi_device_adr_show(struct device *dev,
255 struct device_attribute *attr, char *buf)
257 struct acpi_device *acpi_dev = to_acpi_device(dev);
259 return sprintf(buf, "0x%08x\n",
260 (unsigned int)(acpi_dev->pnp.bus_address));
262 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
265 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
266 struct acpi_device *acpi_dev = to_acpi_device(dev);
267 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
270 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
274 result = sprintf(buf, "%s\n", (char*)path.pointer);
279 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
281 /* sysfs file that shows description text from the ACPI _STR method */
282 static ssize_t description_show(struct device *dev,
283 struct device_attribute *attr,
285 struct acpi_device *acpi_dev = to_acpi_device(dev);
288 if (acpi_dev->pnp.str_obj == NULL)
292 * The _STR object contains a Unicode identifier for a device.
293 * We need to convert to utf-8 so it can be displayed.
295 result = utf16s_to_utf8s(
296 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
297 acpi_dev->pnp.str_obj->buffer.length,
298 UTF16_LITTLE_ENDIAN, buf,
301 buf[result++] = '\n';
305 static DEVICE_ATTR(description, 0444, description_show, NULL);
308 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
310 struct acpi_device *acpi_dev = to_acpi_device(dev);
312 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
314 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
316 static int acpi_device_setup_files(struct acpi_device *dev)
318 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
321 unsigned long long sun;
325 * Devices gotten from FADT don't have a "path" attribute
328 result = device_create_file(&dev->dev, &dev_attr_path);
333 if (!list_empty(&dev->pnp.ids)) {
334 result = device_create_file(&dev->dev, &dev_attr_hid);
338 result = device_create_file(&dev->dev, &dev_attr_modalias);
344 * If device has _STR, 'description' file is created
346 status = acpi_get_handle(dev->handle, "_STR", &temp);
347 if (ACPI_SUCCESS(status)) {
348 status = acpi_evaluate_object(dev->handle, "_STR",
350 if (ACPI_FAILURE(status))
351 buffer.pointer = NULL;
352 dev->pnp.str_obj = buffer.pointer;
353 result = device_create_file(&dev->dev, &dev_attr_description);
358 if (dev->flags.bus_address)
359 result = device_create_file(&dev->dev, &dev_attr_adr);
360 if (dev->pnp.unique_id)
361 result = device_create_file(&dev->dev, &dev_attr_uid);
363 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
364 if (ACPI_SUCCESS(status)) {
365 dev->pnp.sun = (unsigned long)sun;
366 result = device_create_file(&dev->dev, &dev_attr_sun);
370 dev->pnp.sun = (unsigned long)-1;
374 * If device has _EJ0, 'eject' file is created that is used to trigger
375 * hot-removal function from userland.
377 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
378 if (ACPI_SUCCESS(status))
379 result = device_create_file(&dev->dev, &dev_attr_eject);
384 static void acpi_device_remove_files(struct acpi_device *dev)
390 * If device has _STR, remove 'description' file
392 status = acpi_get_handle(dev->handle, "_STR", &temp);
393 if (ACPI_SUCCESS(status)) {
394 kfree(dev->pnp.str_obj);
395 device_remove_file(&dev->dev, &dev_attr_description);
398 * If device has _EJ0, remove 'eject' file.
400 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
401 if (ACPI_SUCCESS(status))
402 device_remove_file(&dev->dev, &dev_attr_eject);
404 status = acpi_get_handle(dev->handle, "_SUN", &temp);
405 if (ACPI_SUCCESS(status))
406 device_remove_file(&dev->dev, &dev_attr_sun);
408 if (dev->pnp.unique_id)
409 device_remove_file(&dev->dev, &dev_attr_uid);
410 if (dev->flags.bus_address)
411 device_remove_file(&dev->dev, &dev_attr_adr);
412 device_remove_file(&dev->dev, &dev_attr_modalias);
413 device_remove_file(&dev->dev, &dev_attr_hid);
415 device_remove_file(&dev->dev, &dev_attr_path);
417 /* --------------------------------------------------------------------------
419 -------------------------------------------------------------------------- */
421 static const struct acpi_device_id *__acpi_match_device(
422 struct acpi_device *device, const struct acpi_device_id *ids)
424 const struct acpi_device_id *id;
425 struct acpi_hardware_id *hwid;
428 * If the device is not present, it is unnecessary to load device
431 if (!device->status.present)
434 for (id = ids; id->id[0]; id++)
435 list_for_each_entry(hwid, &device->pnp.ids, list)
436 if (!strcmp((char *) id->id, hwid->id))
443 * acpi_match_device - Match a struct device against a given list of ACPI IDs
444 * @ids: Array of struct acpi_device_id object to match against.
445 * @dev: The device structure to match.
447 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
448 * object for that handle and use that object to match against a given list of
451 * Return a pointer to the first matching ID on success or %NULL on failure.
453 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
454 const struct device *dev)
456 struct acpi_device *adev;
458 if (!ids || !ACPI_HANDLE(dev)
459 || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
462 return __acpi_match_device(adev, ids);
464 EXPORT_SYMBOL_GPL(acpi_match_device);
466 int acpi_match_device_ids(struct acpi_device *device,
467 const struct acpi_device_id *ids)
469 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
471 EXPORT_SYMBOL(acpi_match_device_ids);
473 static void acpi_free_ids(struct acpi_device *device)
475 struct acpi_hardware_id *id, *tmp;
477 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
483 static void acpi_device_release(struct device *dev)
485 struct acpi_device *acpi_dev = to_acpi_device(dev);
487 acpi_free_ids(acpi_dev);
488 kfree(acpi_dev->pnp.unique_id);
492 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
494 struct acpi_device *acpi_dev = to_acpi_device(dev);
495 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
497 return acpi_dev->add_type >= ACPI_BUS_ADD_MATCH
498 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
501 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
503 struct acpi_device *acpi_dev = to_acpi_device(dev);
506 if (list_empty(&acpi_dev->pnp.ids))
509 if (add_uevent_var(env, "MODALIAS="))
511 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
512 sizeof(env->buf) - env->buflen);
513 if (len >= (sizeof(env->buf) - env->buflen))
519 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
521 struct acpi_device *device = data;
523 device->driver->ops.notify(device, event);
526 static acpi_status acpi_device_notify_fixed(void *data)
528 struct acpi_device *device = data;
530 /* Fixed hardware devices have no handles */
531 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
535 static int acpi_device_install_notify_handler(struct acpi_device *device)
539 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
541 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
542 acpi_device_notify_fixed,
544 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
546 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
547 acpi_device_notify_fixed,
550 status = acpi_install_notify_handler(device->handle,
555 if (ACPI_FAILURE(status))
560 static void acpi_device_remove_notify_handler(struct acpi_device *device)
562 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
563 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
564 acpi_device_notify_fixed);
565 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
566 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
567 acpi_device_notify_fixed);
569 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
573 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
574 static int acpi_device_probe(struct device * dev)
576 struct acpi_device *acpi_dev = to_acpi_device(dev);
577 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
580 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
582 if (acpi_drv->ops.notify) {
583 ret = acpi_device_install_notify_handler(acpi_dev);
585 if (acpi_drv->ops.remove)
586 acpi_drv->ops.remove(acpi_dev,
587 acpi_dev->removal_type);
592 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
593 "Found driver [%s] for device [%s]\n",
594 acpi_drv->name, acpi_dev->pnp.bus_id));
600 static int acpi_device_remove(struct device * dev)
602 struct acpi_device *acpi_dev = to_acpi_device(dev);
603 struct acpi_driver *acpi_drv = acpi_dev->driver;
606 if (acpi_drv->ops.notify)
607 acpi_device_remove_notify_handler(acpi_dev);
608 if (acpi_drv->ops.remove)
609 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
611 acpi_dev->driver = NULL;
612 acpi_dev->driver_data = NULL;
618 struct bus_type acpi_bus_type = {
620 .match = acpi_bus_match,
621 .probe = acpi_device_probe,
622 .remove = acpi_device_remove,
623 .uevent = acpi_device_uevent,
626 static int acpi_device_register(struct acpi_device *device)
629 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
635 * Link this device to its parent and siblings.
637 INIT_LIST_HEAD(&device->children);
638 INIT_LIST_HEAD(&device->node);
639 INIT_LIST_HEAD(&device->wakeup_list);
640 INIT_LIST_HEAD(&device->physical_node_list);
641 mutex_init(&device->physical_node_lock);
643 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
645 printk(KERN_ERR PREFIX "Memory allocation error\n");
649 mutex_lock(&acpi_device_lock);
651 * Find suitable bus_id and instance number in acpi_bus_id_list
652 * If failed, create one and link it into acpi_bus_id_list
654 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
655 if (!strcmp(acpi_device_bus_id->bus_id,
656 acpi_device_hid(device))) {
657 acpi_device_bus_id->instance_no++;
664 acpi_device_bus_id = new_bus_id;
665 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
666 acpi_device_bus_id->instance_no = 0;
667 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
669 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
672 list_add_tail(&device->node, &device->parent->children);
674 if (device->wakeup.flags.valid)
675 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
676 mutex_unlock(&acpi_device_lock);
679 device->dev.parent = &device->parent->dev;
680 device->dev.bus = &acpi_bus_type;
681 device->dev.release = &acpi_device_release;
682 result = device_register(&device->dev);
684 dev_err(&device->dev, "Error registering device\n");
688 result = acpi_device_setup_files(device);
690 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
691 dev_name(&device->dev));
693 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
696 mutex_lock(&acpi_device_lock);
698 list_del(&device->node);
699 list_del(&device->wakeup_list);
700 mutex_unlock(&acpi_device_lock);
704 static void acpi_device_unregister(struct acpi_device *device, int type)
706 mutex_lock(&acpi_device_lock);
708 list_del(&device->node);
710 list_del(&device->wakeup_list);
711 mutex_unlock(&acpi_device_lock);
713 acpi_detach_data(device->handle, acpi_bus_data_handler);
715 acpi_device_remove_files(device);
716 device_unregister(&device->dev);
719 /* --------------------------------------------------------------------------
721 -------------------------------------------------------------------------- */
723 * acpi_bus_driver_init - add a device to a driver
724 * @device: the device to add and initialize
725 * @driver: driver for the device
727 * Used to initialize a device via its device driver. Called whenever a
728 * driver is bound to a device. Invokes the driver's add() ops.
731 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
735 if (!device || !driver)
738 if (!driver->ops.add)
741 result = driver->ops.add(device);
743 device->driver = NULL;
744 device->driver_data = NULL;
748 device->driver = driver;
751 * TBD - Configuration Management: Assign resources to device based
752 * upon possible configuration and currently allocated resources.
755 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
756 "Driver successfully bound to device\n"));
761 * acpi_bus_register_driver - register a driver with the ACPI bus
762 * @driver: driver being registered
764 * Registers a driver with the ACPI bus. Searches the namespace for all
765 * devices that match the driver's criteria and binds. Returns zero for
766 * success or a negative error status for failure.
768 int acpi_bus_register_driver(struct acpi_driver *driver)
774 driver->drv.name = driver->name;
775 driver->drv.bus = &acpi_bus_type;
776 driver->drv.owner = driver->owner;
778 ret = driver_register(&driver->drv);
782 EXPORT_SYMBOL(acpi_bus_register_driver);
785 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
786 * @driver: driver to unregister
788 * Unregisters a driver with the ACPI bus. Searches the namespace for all
789 * devices that match the driver's criteria and unbinds.
791 void acpi_bus_unregister_driver(struct acpi_driver *driver)
793 driver_unregister(&driver->drv);
796 EXPORT_SYMBOL(acpi_bus_unregister_driver);
798 /* --------------------------------------------------------------------------
800 -------------------------------------------------------------------------- */
801 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
805 struct acpi_device *device;
808 * Fixed hardware devices do not appear in the namespace and do not
809 * have handles, but we fabricate acpi_devices for them, so we have
810 * to deal with them specially.
816 status = acpi_get_parent(handle, &handle);
817 if (status == AE_NULL_ENTRY)
819 if (ACPI_FAILURE(status))
822 ret = acpi_bus_get_device(handle, &device);
829 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
833 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
834 union acpi_object *obj;
836 status = acpi_get_handle(handle, "_EJD", &tmp);
837 if (ACPI_FAILURE(status))
840 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
841 if (ACPI_SUCCESS(status)) {
842 obj = buffer.pointer;
843 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
845 kfree(buffer.pointer);
849 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
851 void acpi_bus_data_handler(acpi_handle handle, void *context)
859 static int acpi_bus_get_perf_flags(struct acpi_device *device)
861 device->performance.state = ACPI_STATE_UNKNOWN;
866 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
867 struct acpi_device_wakeup *wakeup)
869 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
870 union acpi_object *package = NULL;
871 union acpi_object *element = NULL;
876 return AE_BAD_PARAMETER;
879 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
880 if (ACPI_FAILURE(status)) {
881 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
885 package = (union acpi_object *)buffer.pointer;
887 if (!package || (package->package.count < 2)) {
888 status = AE_BAD_DATA;
892 element = &(package->package.elements[0]);
894 status = AE_BAD_DATA;
897 if (element->type == ACPI_TYPE_PACKAGE) {
898 if ((element->package.count < 2) ||
899 (element->package.elements[0].type !=
900 ACPI_TYPE_LOCAL_REFERENCE)
901 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
902 status = AE_BAD_DATA;
906 element->package.elements[0].reference.handle;
908 (u32) element->package.elements[1].integer.value;
909 } else if (element->type == ACPI_TYPE_INTEGER) {
910 wakeup->gpe_device = NULL;
911 wakeup->gpe_number = element->integer.value;
913 status = AE_BAD_DATA;
917 element = &(package->package.elements[1]);
918 if (element->type != ACPI_TYPE_INTEGER) {
919 status = AE_BAD_DATA;
922 wakeup->sleep_state = element->integer.value;
924 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
925 status = AE_NO_MEMORY;
928 wakeup->resources.count = package->package.count - 2;
929 for (i = 0; i < wakeup->resources.count; i++) {
930 element = &(package->package.elements[i + 2]);
931 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
932 status = AE_BAD_DATA;
936 wakeup->resources.handles[i] = element->reference.handle;
939 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
942 kfree(buffer.pointer);
947 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
949 struct acpi_device_id button_device_ids[] = {
956 acpi_event_status event_status;
958 device->wakeup.flags.notifier_present = 0;
960 /* Power button, Lid switch always enable wakeup */
961 if (!acpi_match_device_ids(device, button_device_ids)) {
962 device->wakeup.flags.run_wake = 1;
963 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
964 /* Do not use Lid/sleep button for S5 wakeup */
965 if (device->wakeup.sleep_state == ACPI_STATE_S5)
966 device->wakeup.sleep_state = ACPI_STATE_S4;
968 device_set_wakeup_capable(&device->dev, true);
972 status = acpi_get_gpe_status(device->wakeup.gpe_device,
973 device->wakeup.gpe_number,
976 device->wakeup.flags.run_wake =
977 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
980 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
983 acpi_status status = 0;
986 /* Presence of _PRW indicates wake capable */
987 status = acpi_get_handle(device->handle, "_PRW", &temp);
988 if (ACPI_FAILURE(status))
991 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
993 if (ACPI_FAILURE(status)) {
994 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
998 device->wakeup.flags.valid = 1;
999 device->wakeup.prepare_count = 0;
1000 acpi_bus_set_run_wake_flags(device);
1001 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1002 * system for the ACPI device with the _PRW object.
1003 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1004 * So it is necessary to call _DSW object first. Only when it is not
1005 * present will the _PSW object used.
1007 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1009 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1010 "error in _DSW or _PSW evaluation\n"));
1013 static void acpi_bus_add_power_resource(acpi_handle handle);
1015 static int acpi_bus_get_power_flags(struct acpi_device *device)
1017 acpi_status status = 0;
1018 acpi_handle handle = NULL;
1023 * Power Management Flags
1025 status = acpi_get_handle(device->handle, "_PSC", &handle);
1026 if (ACPI_SUCCESS(status))
1027 device->power.flags.explicit_get = 1;
1028 status = acpi_get_handle(device->handle, "_IRC", &handle);
1029 if (ACPI_SUCCESS(status))
1030 device->power.flags.inrush_current = 1;
1033 * Enumerate supported power management states
1035 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1036 struct acpi_device_power_state *ps = &device->power.states[i];
1037 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1039 /* Evaluate "_PRx" to se if power resources are referenced */
1040 acpi_evaluate_reference(device->handle, object_name, NULL,
1042 if (ps->resources.count) {
1045 device->power.flags.power_resources = 1;
1046 for (j = 0; j < ps->resources.count; j++)
1047 acpi_bus_add_power_resource(ps->resources.handles[j]);
1050 /* Evaluate "_PSx" to see if we can do explicit sets */
1051 object_name[2] = 'S';
1052 status = acpi_get_handle(device->handle, object_name, &handle);
1053 if (ACPI_SUCCESS(status))
1054 ps->flags.explicit_set = 1;
1057 * State is valid if there are means to put the device into it.
1058 * D3hot is only valid if _PR3 present.
1060 if (ps->resources.count ||
1061 (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1062 ps->flags.valid = 1;
1063 ps->flags.os_accessible = 1;
1066 ps->power = -1; /* Unknown - driver assigned */
1067 ps->latency = -1; /* Unknown - driver assigned */
1070 /* Set defaults for D0 and D3 states (always valid) */
1071 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1072 device->power.states[ACPI_STATE_D0].power = 100;
1073 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1074 device->power.states[ACPI_STATE_D3].power = 0;
1076 /* Set D3cold's explicit_set flag if _PS3 exists. */
1077 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1078 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1080 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1081 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1082 device->power.flags.power_resources)
1083 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1085 acpi_bus_init_power(device);
1090 static int acpi_bus_get_flags(struct acpi_device *device)
1092 acpi_status status = AE_OK;
1093 acpi_handle temp = NULL;
1096 /* Presence of _STA indicates 'dynamic_status' */
1097 status = acpi_get_handle(device->handle, "_STA", &temp);
1098 if (ACPI_SUCCESS(status))
1099 device->flags.dynamic_status = 1;
1101 /* Presence of _RMV indicates 'removable' */
1102 status = acpi_get_handle(device->handle, "_RMV", &temp);
1103 if (ACPI_SUCCESS(status))
1104 device->flags.removable = 1;
1106 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1107 status = acpi_get_handle(device->handle, "_EJD", &temp);
1108 if (ACPI_SUCCESS(status))
1109 device->flags.ejectable = 1;
1111 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1112 if (ACPI_SUCCESS(status))
1113 device->flags.ejectable = 1;
1116 /* Power resources cannot be power manageable. */
1117 if (device->device_type == ACPI_BUS_TYPE_POWER)
1120 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1121 status = acpi_get_handle(device->handle, "_PS0", &temp);
1122 if (ACPI_FAILURE(status))
1123 status = acpi_get_handle(device->handle, "_PR0", &temp);
1124 if (ACPI_SUCCESS(status))
1125 device->flags.power_manageable = 1;
1127 /* TBD: Performance management */
1132 static void acpi_device_get_busid(struct acpi_device *device)
1134 char bus_id[5] = { '?', 0 };
1135 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1141 * The device's Bus ID is simply the object name.
1142 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1144 if (ACPI_IS_ROOT_DEVICE(device)) {
1145 strcpy(device->pnp.bus_id, "ACPI");
1149 switch (device->device_type) {
1150 case ACPI_BUS_TYPE_POWER_BUTTON:
1151 strcpy(device->pnp.bus_id, "PWRF");
1153 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1154 strcpy(device->pnp.bus_id, "SLPF");
1157 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1158 /* Clean up trailing underscores (if any) */
1159 for (i = 3; i > 1; i--) {
1160 if (bus_id[i] == '_')
1165 strcpy(device->pnp.bus_id, bus_id);
1171 * acpi_bay_match - see if a device is an ejectable driver bay
1173 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1174 * then we can safely call it an ejectable drive bay
1176 static int acpi_bay_match(struct acpi_device *device){
1180 acpi_handle phandle;
1182 handle = device->handle;
1184 status = acpi_get_handle(handle, "_EJ0", &tmp);
1185 if (ACPI_FAILURE(status))
1188 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1189 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1190 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1191 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1194 if (acpi_get_parent(handle, &phandle))
1197 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1198 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1199 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1200 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1207 * acpi_dock_match - see if a device has a _DCK method
1209 static int acpi_dock_match(struct acpi_device *device)
1212 return acpi_get_handle(device->handle, "_DCK", &tmp);
1215 const char *acpi_device_hid(struct acpi_device *device)
1217 struct acpi_hardware_id *hid;
1219 if (list_empty(&device->pnp.ids))
1222 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1225 EXPORT_SYMBOL(acpi_device_hid);
1227 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1229 struct acpi_hardware_id *id;
1231 id = kmalloc(sizeof(*id), GFP_KERNEL);
1235 id->id = kstrdup(dev_id, GFP_KERNEL);
1241 list_add_tail(&id->list, &device->pnp.ids);
1245 * Old IBM workstations have a DSDT bug wherein the SMBus object
1246 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1247 * prefix. Work around this.
1249 static int acpi_ibm_smbus_match(struct acpi_device *device)
1251 acpi_handle h_dummy;
1252 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1255 if (!dmi_name_in_vendors("IBM"))
1258 /* Look for SMBS object */
1259 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1263 if (strcmp("SMBS", path.pointer)) {
1268 /* Does it have the necessary (but misnamed) methods? */
1270 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1271 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1272 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1275 kfree(path.pointer);
1279 static void acpi_device_set_id(struct acpi_device *device)
1282 struct acpi_device_info *info;
1283 struct acpi_pnp_device_id_list *cid_list;
1286 switch (device->device_type) {
1287 case ACPI_BUS_TYPE_DEVICE:
1288 if (ACPI_IS_ROOT_DEVICE(device)) {
1289 acpi_add_id(device, ACPI_SYSTEM_HID);
1293 status = acpi_get_object_info(device->handle, &info);
1294 if (ACPI_FAILURE(status)) {
1295 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1299 if (info->valid & ACPI_VALID_HID)
1300 acpi_add_id(device, info->hardware_id.string);
1301 if (info->valid & ACPI_VALID_CID) {
1302 cid_list = &info->compatible_id_list;
1303 for (i = 0; i < cid_list->count; i++)
1304 acpi_add_id(device, cid_list->ids[i].string);
1306 if (info->valid & ACPI_VALID_ADR) {
1307 device->pnp.bus_address = info->address;
1308 device->flags.bus_address = 1;
1310 if (info->valid & ACPI_VALID_UID)
1311 device->pnp.unique_id = kstrdup(info->unique_id.string,
1317 * Some devices don't reliably have _HIDs & _CIDs, so add
1318 * synthetic HIDs to make sure drivers can find them.
1320 if (acpi_is_video_device(device))
1321 acpi_add_id(device, ACPI_VIDEO_HID);
1322 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1323 acpi_add_id(device, ACPI_BAY_HID);
1324 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1325 acpi_add_id(device, ACPI_DOCK_HID);
1326 else if (!acpi_ibm_smbus_match(device))
1327 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1328 else if (!acpi_device_hid(device) &&
1329 ACPI_IS_ROOT_DEVICE(device->parent)) {
1330 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1331 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1332 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1336 case ACPI_BUS_TYPE_POWER:
1337 acpi_add_id(device, ACPI_POWER_HID);
1339 case ACPI_BUS_TYPE_PROCESSOR:
1340 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1342 case ACPI_BUS_TYPE_THERMAL:
1343 acpi_add_id(device, ACPI_THERMAL_HID);
1345 case ACPI_BUS_TYPE_POWER_BUTTON:
1346 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1348 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1349 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1354 static int acpi_device_set_context(struct acpi_device *device)
1361 * Attach this 'struct acpi_device' to the ACPI object. This makes
1362 * resolutions from handle->device very efficient. Fixed hardware
1363 * devices have no handles, so we skip them.
1365 if (!device->handle)
1368 status = acpi_attach_data(device->handle,
1369 acpi_bus_data_handler, device);
1370 if (ACPI_SUCCESS(status))
1373 printk(KERN_ERR PREFIX "Error attaching device data\n");
1377 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1382 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1383 device_release_driver(&dev->dev);
1389 * unbind _ADR-Based Devices when hot removal
1391 if (dev->flags.bus_address) {
1392 if ((dev->parent) && (dev->parent->ops.unbind))
1393 dev->parent->ops.unbind(dev);
1395 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1401 * acpi_hot_add_bind - Bind _ADR-based devices on hot-add.
1402 * @device: ACPI device node to bind.
1404 static void acpi_hot_add_bind(struct acpi_device *device)
1406 if (device->flags.bus_address
1407 && device->parent && device->parent->ops.bind)
1408 device->parent->ops.bind(device);
1411 static int acpi_add_single_object(struct acpi_device **child,
1412 acpi_handle handle, int type,
1413 unsigned long long sta,
1414 enum acpi_bus_add_type add_type)
1417 struct acpi_device *device;
1418 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1420 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1422 printk(KERN_ERR PREFIX "Memory allocation error\n");
1426 INIT_LIST_HEAD(&device->pnp.ids);
1427 device->device_type = type;
1428 device->handle = handle;
1429 device->parent = acpi_bus_get_parent(handle);
1430 device->add_type = add_type;
1431 STRUCT_TO_INT(device->status) = sta;
1433 acpi_device_get_busid(device);
1438 * Note that we only look for object handles -- cannot evaluate objects
1439 * until we know the device is present and properly initialized.
1441 result = acpi_bus_get_flags(device);
1448 * TBD: Synch with Core's enumeration/initialization process.
1450 acpi_device_set_id(device);
1456 if (device->flags.power_manageable) {
1457 result = acpi_bus_get_power_flags(device);
1463 * Wakeup device management
1464 *-----------------------
1466 acpi_bus_get_wakeup_device_flags(device);
1469 * Performance Management
1470 * ----------------------
1472 if (device->flags.performance_manageable) {
1473 result = acpi_bus_get_perf_flags(device);
1478 if ((result = acpi_device_set_context(device)))
1481 result = acpi_device_register(device);
1483 if (device->add_type >= ACPI_BUS_ADD_MATCH)
1484 acpi_hot_add_bind(device);
1488 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1489 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1490 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1491 (char *) buffer.pointer,
1492 device->parent ? dev_name(&device->parent->dev) :
1494 kfree(buffer.pointer);
1497 acpi_device_release(&device->dev);
1502 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1503 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1505 static void acpi_bus_add_power_resource(acpi_handle handle)
1507 struct acpi_device *device = NULL;
1509 acpi_bus_get_device(handle, &device);
1511 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1512 ACPI_STA_DEFAULT, ACPI_BUS_ADD_START);
1515 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1516 unsigned long long *sta)
1519 acpi_object_type acpi_type;
1521 status = acpi_get_type(handle, &acpi_type);
1522 if (ACPI_FAILURE(status))
1525 switch (acpi_type) {
1526 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1527 case ACPI_TYPE_DEVICE:
1528 *type = ACPI_BUS_TYPE_DEVICE;
1529 status = acpi_bus_get_status_handle(handle, sta);
1530 if (ACPI_FAILURE(status))
1533 case ACPI_TYPE_PROCESSOR:
1534 *type = ACPI_BUS_TYPE_PROCESSOR;
1535 status = acpi_bus_get_status_handle(handle, sta);
1536 if (ACPI_FAILURE(status))
1539 case ACPI_TYPE_THERMAL:
1540 *type = ACPI_BUS_TYPE_THERMAL;
1541 *sta = ACPI_STA_DEFAULT;
1543 case ACPI_TYPE_POWER:
1544 *type = ACPI_BUS_TYPE_POWER;
1545 *sta = ACPI_STA_DEFAULT;
1554 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1555 void *context, void **return_value)
1557 struct acpi_device *device = NULL;
1559 unsigned long long sta;
1563 acpi_bus_get_device(handle, &device);
1567 result = acpi_bus_type_and_status(handle, &type, &sta);
1571 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1572 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1573 struct acpi_device_wakeup wakeup;
1576 status = acpi_get_handle(handle, "_PRW", &temp);
1577 if (ACPI_SUCCESS(status))
1578 acpi_bus_extract_wakeup_device_power_package(handle,
1580 return AE_CTRL_DEPTH;
1583 acpi_add_single_object(&device, handle, type, sta, ACPI_BUS_ADD_BASIC);
1585 return AE_CTRL_DEPTH;
1587 device->add_type = context ? ACPI_BUS_ADD_START : ACPI_BUS_ADD_MATCH;
1588 acpi_hot_add_bind(device);
1592 *return_value = device;
1597 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1598 void *not_used, void **ret_not_used)
1600 acpi_status status = AE_OK;
1601 struct acpi_device *device;
1602 unsigned long long sta_not_used;
1606 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1607 * namespace walks prematurely.
1609 if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1612 if (acpi_bus_get_device(handle, &device))
1613 return AE_CTRL_DEPTH;
1615 if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1616 /* This is a known good platform device. */
1617 acpi_create_platform_device(device);
1618 } else if (device_attach(&device->dev)) {
1619 status = AE_CTRL_DEPTH;
1624 static int acpi_bus_scan(acpi_handle handle, bool start,
1625 struct acpi_device **child)
1627 void *device = NULL;
1631 status = acpi_bus_check_add(handle, 0, (void *)start, &device);
1632 if (ACPI_SUCCESS(status))
1633 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1634 acpi_bus_check_add, NULL, (void *)start,
1641 status = acpi_bus_device_attach(handle, 0, NULL, NULL);
1642 if (ACPI_SUCCESS(status))
1643 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1644 acpi_bus_device_attach, NULL, NULL, NULL);
1654 * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
1655 * @handle: Root of the namespace scope to scan.
1656 * @ret: Location to store a return struct acpi_device pointer.
1658 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1661 * If no devices were found, -ENODEV is returned, but it does not mean that
1662 * there has been a real error. There just have been no suitable ACPI objects
1663 * in the table trunk from which the kernel could create a device and add an
1664 * appropriate driver.
1666 * If 0 is returned, the memory location pointed to by @ret will be populated
1667 * with a pointer to a struct acpi_device created while scanning the namespace.
1668 * If @handle corresponds to a device node, that will be a pointer to the struct
1669 * acpi_device object corresponding to @handle. Otherwise, it will be a pointer
1670 * to a struct acpi_device corresponding to one of its descendants.
1672 * If an error code is returned, NULL will be stored in the memory location
1673 * pointed to by @ret.
1675 int acpi_bus_add(acpi_handle handle, struct acpi_device **ret)
1679 err = acpi_bus_scan(handle, false, ret);
1683 acpi_update_all_gpes();
1686 EXPORT_SYMBOL(acpi_bus_add);
1688 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1691 struct acpi_device *parent, *child;
1692 acpi_handle phandle, chandle;
1693 acpi_object_type type;
1698 phandle = start->handle;
1699 child = chandle = NULL;
1701 while ((level > 0) && parent && (!err)) {
1702 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1706 * If this scope is exhausted then move our way back up.
1708 if (ACPI_FAILURE(status)) {
1711 acpi_get_parent(phandle, &phandle);
1713 parent = parent->parent;
1716 err = acpi_bus_remove(child, rmdevice);
1718 err = acpi_bus_remove(child, 1);
1723 status = acpi_get_type(chandle, &type);
1724 if (ACPI_FAILURE(status)) {
1728 * If there is a device corresponding to chandle then
1729 * parse it (depth-first).
1731 if (acpi_bus_get_device(chandle, &child) == 0) {
1741 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1743 static int acpi_bus_scan_fixed(void)
1746 struct acpi_device *device = NULL;
1749 * Enumerate all fixed-feature devices.
1751 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1752 result = acpi_add_single_object(&device, NULL,
1753 ACPI_BUS_TYPE_POWER_BUTTON,
1755 ACPI_BUS_ADD_START);
1756 device_init_wakeup(&device->dev, true);
1759 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1760 result = acpi_add_single_object(&device, NULL,
1761 ACPI_BUS_TYPE_SLEEP_BUTTON,
1763 ACPI_BUS_ADD_START);
1769 int __init acpi_scan_init(void)
1773 result = bus_register(&acpi_bus_type);
1775 /* We don't want to quit even if we failed to add suspend/resume */
1776 printk(KERN_ERR PREFIX "Could not register bus type\n");
1780 acpi_pci_root_init();
1783 * Enumerate devices in the ACPI namespace.
1785 result = acpi_bus_scan(ACPI_ROOT_OBJECT, true, &acpi_root);
1788 result = acpi_bus_scan_fixed();
1791 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1793 acpi_update_all_gpes();