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";
32 static LIST_HEAD(acpi_device_list);
33 static LIST_HEAD(acpi_bus_id_list);
34 static DEFINE_MUTEX(acpi_scan_lock);
35 static LIST_HEAD(acpi_scan_handlers_list);
36 DEFINE_MUTEX(acpi_device_lock);
37 LIST_HEAD(acpi_wakeup_device_list);
39 struct acpi_device_bus_id{
41 unsigned int instance_no;
42 struct list_head node;
45 void acpi_scan_lock_acquire(void)
47 mutex_lock(&acpi_scan_lock);
49 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
51 void acpi_scan_lock_release(void)
53 mutex_unlock(&acpi_scan_lock);
55 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
57 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
59 if (!handler || !handler->attach)
62 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
67 * Creates hid/cid(s) string needed for modalias and uevent
68 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
69 * char *modalias: "acpi:IBM0001:ACPI0001"
71 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
76 struct acpi_hardware_id *id;
78 if (list_empty(&acpi_dev->pnp.ids))
81 len = snprintf(modalias, size, "acpi:");
84 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
85 count = snprintf(&modalias[len], size, "%s:", id->id);
86 if (count < 0 || count >= size)
97 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
98 struct acpi_device *acpi_dev = to_acpi_device(dev);
101 /* Device has no HID and no CID or string is >1024 */
102 len = create_modalias(acpi_dev, buf, 1024);
108 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
111 * acpi_bus_hot_remove_device: hot-remove a device and its children
112 * @context: struct acpi_eject_event pointer (freed in this func)
114 * Hot-remove a device and its children. This function frees up the
115 * memory space passed by arg context, so that the caller may call
116 * this function asynchronously through acpi_os_hotplug_execute().
118 void acpi_bus_hot_remove_device(void *context)
120 struct acpi_eject_event *ej_event = context;
121 struct acpi_device *device = ej_event->device;
122 acpi_handle handle = device->handle;
124 struct acpi_object_list arg_list;
125 union acpi_object arg;
126 acpi_status status = AE_OK;
127 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
129 mutex_lock(&acpi_scan_lock);
131 /* If there is no handle, the device node has been unregistered. */
132 if (!device->handle) {
133 dev_dbg(&device->dev, "ACPI handle missing\n");
134 put_device(&device->dev);
138 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
139 "Hot-removing device %s...\n", dev_name(&device->dev)));
141 acpi_bus_trim(device);
142 /* Device node has been unregistered. */
143 put_device(&device->dev);
146 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
148 arg_list.pointer = &arg;
149 arg.type = ACPI_TYPE_INTEGER;
150 arg.integer.value = 0;
151 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
155 arg_list.pointer = &arg;
156 arg.type = ACPI_TYPE_INTEGER;
157 arg.integer.value = 1;
162 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
163 if (ACPI_FAILURE(status)) {
164 if (status != AE_NOT_FOUND)
165 acpi_handle_warn(handle, "Eject failed\n");
167 /* Tell the firmware the hot-remove operation has failed. */
168 acpi_evaluate_hotplug_ost(handle, ej_event->event,
173 mutex_unlock(&acpi_scan_lock);
177 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
179 static ssize_t real_power_state_show(struct device *dev,
180 struct device_attribute *attr, char *buf)
182 struct acpi_device *adev = to_acpi_device(dev);
186 ret = acpi_device_get_power(adev, &state);
190 return sprintf(buf, "%s\n", acpi_power_state_string(state));
193 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
195 static ssize_t power_state_show(struct device *dev,
196 struct device_attribute *attr, char *buf)
198 struct acpi_device *adev = to_acpi_device(dev);
200 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
203 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
206 acpi_eject_store(struct device *d, struct device_attribute *attr,
207 const char *buf, size_t count)
211 acpi_object_type type = 0;
212 struct acpi_device *acpi_device = to_acpi_device(d);
213 struct acpi_eject_event *ej_event;
215 if ((!count) || (buf[0] != '1')) {
218 if (!acpi_device->driver && !acpi_device->handler) {
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 get_device(&acpi_device->dev);
235 ej_event->device = acpi_device;
236 if (acpi_device->flags.eject_pending) {
237 /* event originated from ACPI eject notification */
238 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
239 acpi_device->flags.eject_pending = 0;
241 /* event originated from user */
242 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
243 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
244 ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
247 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
248 if (ACPI_FAILURE(status)) {
249 put_device(&acpi_device->dev);
256 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
259 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
260 struct acpi_device *acpi_dev = to_acpi_device(dev);
262 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
264 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
266 static ssize_t acpi_device_uid_show(struct device *dev,
267 struct device_attribute *attr, char *buf)
269 struct acpi_device *acpi_dev = to_acpi_device(dev);
271 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
273 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
275 static ssize_t acpi_device_adr_show(struct device *dev,
276 struct device_attribute *attr, char *buf)
278 struct acpi_device *acpi_dev = to_acpi_device(dev);
280 return sprintf(buf, "0x%08x\n",
281 (unsigned int)(acpi_dev->pnp.bus_address));
283 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
286 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
287 struct acpi_device *acpi_dev = to_acpi_device(dev);
288 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
291 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
295 result = sprintf(buf, "%s\n", (char*)path.pointer);
300 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
302 /* sysfs file that shows description text from the ACPI _STR method */
303 static ssize_t description_show(struct device *dev,
304 struct device_attribute *attr,
306 struct acpi_device *acpi_dev = to_acpi_device(dev);
309 if (acpi_dev->pnp.str_obj == NULL)
313 * The _STR object contains a Unicode identifier for a device.
314 * We need to convert to utf-8 so it can be displayed.
316 result = utf16s_to_utf8s(
317 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
318 acpi_dev->pnp.str_obj->buffer.length,
319 UTF16_LITTLE_ENDIAN, buf,
322 buf[result++] = '\n';
326 static DEVICE_ATTR(description, 0444, description_show, NULL);
329 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
331 struct acpi_device *acpi_dev = to_acpi_device(dev);
333 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
335 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
337 static int acpi_device_setup_files(struct acpi_device *dev)
339 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
342 unsigned long long sun;
346 * Devices gotten from FADT don't have a "path" attribute
349 result = device_create_file(&dev->dev, &dev_attr_path);
354 if (!list_empty(&dev->pnp.ids)) {
355 result = device_create_file(&dev->dev, &dev_attr_hid);
359 result = device_create_file(&dev->dev, &dev_attr_modalias);
365 * If device has _STR, 'description' file is created
367 status = acpi_get_handle(dev->handle, "_STR", &temp);
368 if (ACPI_SUCCESS(status)) {
369 status = acpi_evaluate_object(dev->handle, "_STR",
371 if (ACPI_FAILURE(status))
372 buffer.pointer = NULL;
373 dev->pnp.str_obj = buffer.pointer;
374 result = device_create_file(&dev->dev, &dev_attr_description);
379 if (dev->flags.bus_address)
380 result = device_create_file(&dev->dev, &dev_attr_adr);
381 if (dev->pnp.unique_id)
382 result = device_create_file(&dev->dev, &dev_attr_uid);
384 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
385 if (ACPI_SUCCESS(status)) {
386 dev->pnp.sun = (unsigned long)sun;
387 result = device_create_file(&dev->dev, &dev_attr_sun);
391 dev->pnp.sun = (unsigned long)-1;
395 * If device has _EJ0, 'eject' file is created that is used to trigger
396 * hot-removal function from userland.
398 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
399 if (ACPI_SUCCESS(status)) {
400 result = device_create_file(&dev->dev, &dev_attr_eject);
405 if (dev->flags.power_manageable) {
406 result = device_create_file(&dev->dev, &dev_attr_power_state);
410 if (dev->power.flags.power_resources)
411 result = device_create_file(&dev->dev,
412 &dev_attr_real_power_state);
419 static void acpi_device_remove_files(struct acpi_device *dev)
424 if (dev->flags.power_manageable) {
425 device_remove_file(&dev->dev, &dev_attr_power_state);
426 if (dev->power.flags.power_resources)
427 device_remove_file(&dev->dev,
428 &dev_attr_real_power_state);
432 * If device has _STR, remove 'description' file
434 status = acpi_get_handle(dev->handle, "_STR", &temp);
435 if (ACPI_SUCCESS(status)) {
436 kfree(dev->pnp.str_obj);
437 device_remove_file(&dev->dev, &dev_attr_description);
440 * If device has _EJ0, remove 'eject' file.
442 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
443 if (ACPI_SUCCESS(status))
444 device_remove_file(&dev->dev, &dev_attr_eject);
446 status = acpi_get_handle(dev->handle, "_SUN", &temp);
447 if (ACPI_SUCCESS(status))
448 device_remove_file(&dev->dev, &dev_attr_sun);
450 if (dev->pnp.unique_id)
451 device_remove_file(&dev->dev, &dev_attr_uid);
452 if (dev->flags.bus_address)
453 device_remove_file(&dev->dev, &dev_attr_adr);
454 device_remove_file(&dev->dev, &dev_attr_modalias);
455 device_remove_file(&dev->dev, &dev_attr_hid);
457 device_remove_file(&dev->dev, &dev_attr_path);
459 /* --------------------------------------------------------------------------
461 -------------------------------------------------------------------------- */
463 static const struct acpi_device_id *__acpi_match_device(
464 struct acpi_device *device, const struct acpi_device_id *ids)
466 const struct acpi_device_id *id;
467 struct acpi_hardware_id *hwid;
470 * If the device is not present, it is unnecessary to load device
473 if (!device->status.present)
476 for (id = ids; id->id[0]; id++)
477 list_for_each_entry(hwid, &device->pnp.ids, list)
478 if (!strcmp((char *) id->id, hwid->id))
485 * acpi_match_device - Match a struct device against a given list of ACPI IDs
486 * @ids: Array of struct acpi_device_id object to match against.
487 * @dev: The device structure to match.
489 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
490 * object for that handle and use that object to match against a given list of
493 * Return a pointer to the first matching ID on success or %NULL on failure.
495 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
496 const struct device *dev)
498 struct acpi_device *adev;
499 acpi_handle handle = ACPI_HANDLE(dev);
501 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
504 return __acpi_match_device(adev, ids);
506 EXPORT_SYMBOL_GPL(acpi_match_device);
508 int acpi_match_device_ids(struct acpi_device *device,
509 const struct acpi_device_id *ids)
511 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
513 EXPORT_SYMBOL(acpi_match_device_ids);
515 void acpi_free_ids(struct acpi_device *device)
517 struct acpi_hardware_id *id, *tmp;
519 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
523 kfree(device->pnp.unique_id);
526 static void acpi_free_power_resources_lists(struct acpi_device *device)
530 if (device->wakeup.flags.valid)
531 acpi_power_resources_list_free(&device->wakeup.resources);
533 if (!device->flags.power_manageable)
536 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
537 struct acpi_device_power_state *ps = &device->power.states[i];
538 acpi_power_resources_list_free(&ps->resources);
542 static void acpi_device_release(struct device *dev)
544 struct acpi_device *acpi_dev = to_acpi_device(dev);
546 acpi_free_ids(acpi_dev);
547 acpi_free_power_resources_lists(acpi_dev);
551 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
553 struct acpi_device *acpi_dev = to_acpi_device(dev);
554 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
556 return acpi_dev->flags.match_driver
557 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
560 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
562 struct acpi_device *acpi_dev = to_acpi_device(dev);
565 if (list_empty(&acpi_dev->pnp.ids))
568 if (add_uevent_var(env, "MODALIAS="))
570 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
571 sizeof(env->buf) - env->buflen);
572 if (len >= (sizeof(env->buf) - env->buflen))
578 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
580 struct acpi_device *device = data;
582 device->driver->ops.notify(device, event);
585 static acpi_status acpi_device_notify_fixed(void *data)
587 struct acpi_device *device = data;
589 /* Fixed hardware devices have no handles */
590 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
594 static int acpi_device_install_notify_handler(struct acpi_device *device)
598 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
600 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
601 acpi_device_notify_fixed,
603 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
605 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
606 acpi_device_notify_fixed,
609 status = acpi_install_notify_handler(device->handle,
614 if (ACPI_FAILURE(status))
619 static void acpi_device_remove_notify_handler(struct acpi_device *device)
621 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
622 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
623 acpi_device_notify_fixed);
624 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
625 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
626 acpi_device_notify_fixed);
628 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
632 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
633 static int acpi_device_probe(struct device * dev)
635 struct acpi_device *acpi_dev = to_acpi_device(dev);
636 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
639 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
641 if (acpi_drv->ops.notify) {
642 ret = acpi_device_install_notify_handler(acpi_dev);
644 if (acpi_drv->ops.remove)
645 acpi_drv->ops.remove(acpi_dev);
646 acpi_dev->driver = NULL;
647 acpi_dev->driver_data = NULL;
652 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
653 "Found driver [%s] for device [%s]\n",
654 acpi_drv->name, acpi_dev->pnp.bus_id));
660 static int acpi_device_remove(struct device * dev)
662 struct acpi_device *acpi_dev = to_acpi_device(dev);
663 struct acpi_driver *acpi_drv = acpi_dev->driver;
666 if (acpi_drv->ops.notify)
667 acpi_device_remove_notify_handler(acpi_dev);
668 if (acpi_drv->ops.remove)
669 acpi_drv->ops.remove(acpi_dev);
671 acpi_dev->driver = NULL;
672 acpi_dev->driver_data = NULL;
678 struct bus_type acpi_bus_type = {
680 .match = acpi_bus_match,
681 .probe = acpi_device_probe,
682 .remove = acpi_device_remove,
683 .uevent = acpi_device_uevent,
686 int acpi_device_add(struct acpi_device *device,
687 void (*release)(struct device *))
690 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
693 if (device->handle) {
696 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
698 if (ACPI_FAILURE(status)) {
699 acpi_handle_err(device->handle,
700 "Unable to attach device data\n");
708 * Link this device to its parent and siblings.
710 INIT_LIST_HEAD(&device->children);
711 INIT_LIST_HEAD(&device->node);
712 INIT_LIST_HEAD(&device->wakeup_list);
713 INIT_LIST_HEAD(&device->physical_node_list);
714 mutex_init(&device->physical_node_lock);
715 INIT_LIST_HEAD(&device->power_dependent);
717 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
719 pr_err(PREFIX "Memory allocation error\n");
724 mutex_lock(&acpi_device_lock);
726 * Find suitable bus_id and instance number in acpi_bus_id_list
727 * If failed, create one and link it into acpi_bus_id_list
729 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
730 if (!strcmp(acpi_device_bus_id->bus_id,
731 acpi_device_hid(device))) {
732 acpi_device_bus_id->instance_no++;
739 acpi_device_bus_id = new_bus_id;
740 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
741 acpi_device_bus_id->instance_no = 0;
742 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
744 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
747 list_add_tail(&device->node, &device->parent->children);
749 if (device->wakeup.flags.valid)
750 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
751 mutex_unlock(&acpi_device_lock);
754 device->dev.parent = &device->parent->dev;
755 device->dev.bus = &acpi_bus_type;
756 device->dev.release = release;
757 result = device_add(&device->dev);
759 dev_err(&device->dev, "Error registering device\n");
763 result = acpi_device_setup_files(device);
765 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
766 dev_name(&device->dev));
768 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
772 mutex_lock(&acpi_device_lock);
774 list_del(&device->node);
775 list_del(&device->wakeup_list);
776 mutex_unlock(&acpi_device_lock);
779 acpi_detach_data(device->handle, acpi_bus_data_handler);
783 static void acpi_device_unregister(struct acpi_device *device)
785 mutex_lock(&acpi_device_lock);
787 list_del(&device->node);
789 list_del(&device->wakeup_list);
790 mutex_unlock(&acpi_device_lock);
792 acpi_detach_data(device->handle, acpi_bus_data_handler);
794 acpi_power_add_remove_device(device, false);
795 acpi_device_remove_files(device);
797 device->remove(device);
799 device_del(&device->dev);
801 * Transition the device to D3cold to drop the reference counts of all
802 * power resources the device depends on and turn off the ones that have
803 * no more references.
805 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
806 device->handle = NULL;
807 put_device(&device->dev);
810 /* --------------------------------------------------------------------------
812 -------------------------------------------------------------------------- */
814 * acpi_bus_driver_init - add a device to a driver
815 * @device: the device to add and initialize
816 * @driver: driver for the device
818 * Used to initialize a device via its device driver. Called whenever a
819 * driver is bound to a device. Invokes the driver's add() ops.
822 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
826 if (!device || !driver)
829 if (!driver->ops.add)
832 result = driver->ops.add(device);
834 device->driver = NULL;
835 device->driver_data = NULL;
839 device->driver = driver;
842 * TBD - Configuration Management: Assign resources to device based
843 * upon possible configuration and currently allocated resources.
846 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
847 "Driver successfully bound to device\n"));
852 * acpi_bus_register_driver - register a driver with the ACPI bus
853 * @driver: driver being registered
855 * Registers a driver with the ACPI bus. Searches the namespace for all
856 * devices that match the driver's criteria and binds. Returns zero for
857 * success or a negative error status for failure.
859 int acpi_bus_register_driver(struct acpi_driver *driver)
865 driver->drv.name = driver->name;
866 driver->drv.bus = &acpi_bus_type;
867 driver->drv.owner = driver->owner;
869 ret = driver_register(&driver->drv);
873 EXPORT_SYMBOL(acpi_bus_register_driver);
876 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
877 * @driver: driver to unregister
879 * Unregisters a driver with the ACPI bus. Searches the namespace for all
880 * devices that match the driver's criteria and unbinds.
882 void acpi_bus_unregister_driver(struct acpi_driver *driver)
884 driver_unregister(&driver->drv);
887 EXPORT_SYMBOL(acpi_bus_unregister_driver);
889 /* --------------------------------------------------------------------------
891 -------------------------------------------------------------------------- */
892 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
894 struct acpi_device *device = NULL;
898 * Fixed hardware devices do not appear in the namespace and do not
899 * have handles, but we fabricate acpi_devices for them, so we have
900 * to deal with them specially.
906 status = acpi_get_parent(handle, &handle);
907 if (ACPI_FAILURE(status))
908 return status == AE_NULL_ENTRY ? NULL : acpi_root;
909 } while (acpi_bus_get_device(handle, &device));
914 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
918 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
919 union acpi_object *obj;
921 status = acpi_get_handle(handle, "_EJD", &tmp);
922 if (ACPI_FAILURE(status))
925 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
926 if (ACPI_SUCCESS(status)) {
927 obj = buffer.pointer;
928 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
930 kfree(buffer.pointer);
934 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
936 void acpi_bus_data_handler(acpi_handle handle, void *context)
944 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
945 struct acpi_device_wakeup *wakeup)
947 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
948 union acpi_object *package = NULL;
949 union acpi_object *element = NULL;
956 INIT_LIST_HEAD(&wakeup->resources);
959 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
960 if (ACPI_FAILURE(status)) {
961 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
965 package = (union acpi_object *)buffer.pointer;
967 if (!package || package->package.count < 2)
970 element = &(package->package.elements[0]);
974 if (element->type == ACPI_TYPE_PACKAGE) {
975 if ((element->package.count < 2) ||
976 (element->package.elements[0].type !=
977 ACPI_TYPE_LOCAL_REFERENCE)
978 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
982 element->package.elements[0].reference.handle;
984 (u32) element->package.elements[1].integer.value;
985 } else if (element->type == ACPI_TYPE_INTEGER) {
986 wakeup->gpe_device = NULL;
987 wakeup->gpe_number = element->integer.value;
992 element = &(package->package.elements[1]);
993 if (element->type != ACPI_TYPE_INTEGER)
996 wakeup->sleep_state = element->integer.value;
998 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1002 if (!list_empty(&wakeup->resources)) {
1005 sleep_state = acpi_power_min_system_level(&wakeup->resources);
1006 if (sleep_state < wakeup->sleep_state) {
1007 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1008 "(S%d) by S%d from power resources\n",
1009 (int)wakeup->sleep_state, sleep_state);
1010 wakeup->sleep_state = sleep_state;
1013 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1016 kfree(buffer.pointer);
1020 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1022 struct acpi_device_id button_device_ids[] = {
1029 acpi_event_status event_status;
1031 device->wakeup.flags.notifier_present = 0;
1033 /* Power button, Lid switch always enable wakeup */
1034 if (!acpi_match_device_ids(device, button_device_ids)) {
1035 device->wakeup.flags.run_wake = 1;
1036 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1037 /* Do not use Lid/sleep button for S5 wakeup */
1038 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1039 device->wakeup.sleep_state = ACPI_STATE_S4;
1041 device_set_wakeup_capable(&device->dev, true);
1045 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1046 device->wakeup.gpe_number,
1048 if (status == AE_OK)
1049 device->wakeup.flags.run_wake =
1050 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1053 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1056 acpi_status status = 0;
1059 /* Presence of _PRW indicates wake capable */
1060 status = acpi_get_handle(device->handle, "_PRW", &temp);
1061 if (ACPI_FAILURE(status))
1064 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1067 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1071 device->wakeup.flags.valid = 1;
1072 device->wakeup.prepare_count = 0;
1073 acpi_bus_set_run_wake_flags(device);
1074 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1075 * system for the ACPI device with the _PRW object.
1076 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1077 * So it is necessary to call _DSW object first. Only when it is not
1078 * present will the _PSW object used.
1080 err = acpi_device_sleep_wake(device, 0, 0, 0);
1082 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1083 "error in _DSW or _PSW evaluation\n"));
1086 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1088 struct acpi_device_power_state *ps = &device->power.states[state];
1089 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1090 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1094 INIT_LIST_HEAD(&ps->resources);
1096 /* Evaluate "_PRx" to get referenced power resources */
1097 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1098 if (ACPI_SUCCESS(status)) {
1099 union acpi_object *package = buffer.pointer;
1101 if (buffer.length && package
1102 && package->type == ACPI_TYPE_PACKAGE
1103 && package->package.count) {
1104 int err = acpi_extract_power_resources(package, 0,
1107 device->power.flags.power_resources = 1;
1109 ACPI_FREE(buffer.pointer);
1112 /* Evaluate "_PSx" to see if we can do explicit sets */
1114 status = acpi_get_handle(device->handle, pathname, &handle);
1115 if (ACPI_SUCCESS(status))
1116 ps->flags.explicit_set = 1;
1119 * State is valid if there are means to put the device into it.
1120 * D3hot is only valid if _PR3 present.
1122 if (!list_empty(&ps->resources)
1123 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1124 ps->flags.valid = 1;
1125 ps->flags.os_accessible = 1;
1128 ps->power = -1; /* Unknown - driver assigned */
1129 ps->latency = -1; /* Unknown - driver assigned */
1132 static void acpi_bus_get_power_flags(struct acpi_device *device)
1138 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1139 status = acpi_get_handle(device->handle, "_PS0", &handle);
1140 if (ACPI_FAILURE(status)) {
1141 status = acpi_get_handle(device->handle, "_PR0", &handle);
1142 if (ACPI_FAILURE(status))
1146 device->flags.power_manageable = 1;
1149 * Power Management Flags
1151 status = acpi_get_handle(device->handle, "_PSC", &handle);
1152 if (ACPI_SUCCESS(status))
1153 device->power.flags.explicit_get = 1;
1154 status = acpi_get_handle(device->handle, "_IRC", &handle);
1155 if (ACPI_SUCCESS(status))
1156 device->power.flags.inrush_current = 1;
1159 * Enumerate supported power management states
1161 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1162 acpi_bus_init_power_state(device, i);
1164 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1166 /* Set defaults for D0 and D3 states (always valid) */
1167 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1168 device->power.states[ACPI_STATE_D0].power = 100;
1169 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1170 device->power.states[ACPI_STATE_D3].power = 0;
1172 /* Set D3cold's explicit_set flag if _PS3 exists. */
1173 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1174 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1176 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1177 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1178 device->power.flags.power_resources)
1179 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1181 if (acpi_bus_init_power(device)) {
1182 acpi_free_power_resources_lists(device);
1183 device->flags.power_manageable = 0;
1187 static void acpi_bus_get_flags(struct acpi_device *device)
1189 acpi_status status = AE_OK;
1190 acpi_handle temp = NULL;
1192 /* Presence of _STA indicates 'dynamic_status' */
1193 status = acpi_get_handle(device->handle, "_STA", &temp);
1194 if (ACPI_SUCCESS(status))
1195 device->flags.dynamic_status = 1;
1197 /* Presence of _RMV indicates 'removable' */
1198 status = acpi_get_handle(device->handle, "_RMV", &temp);
1199 if (ACPI_SUCCESS(status))
1200 device->flags.removable = 1;
1202 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1203 status = acpi_get_handle(device->handle, "_EJD", &temp);
1204 if (ACPI_SUCCESS(status))
1205 device->flags.ejectable = 1;
1207 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1208 if (ACPI_SUCCESS(status))
1209 device->flags.ejectable = 1;
1213 static void acpi_device_get_busid(struct acpi_device *device)
1215 char bus_id[5] = { '?', 0 };
1216 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1222 * The device's Bus ID is simply the object name.
1223 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1225 if (ACPI_IS_ROOT_DEVICE(device)) {
1226 strcpy(device->pnp.bus_id, "ACPI");
1230 switch (device->device_type) {
1231 case ACPI_BUS_TYPE_POWER_BUTTON:
1232 strcpy(device->pnp.bus_id, "PWRF");
1234 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1235 strcpy(device->pnp.bus_id, "SLPF");
1238 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1239 /* Clean up trailing underscores (if any) */
1240 for (i = 3; i > 1; i--) {
1241 if (bus_id[i] == '_')
1246 strcpy(device->pnp.bus_id, bus_id);
1252 * acpi_bay_match - see if a device is an ejectable driver bay
1254 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1255 * then we can safely call it an ejectable drive bay
1257 static int acpi_bay_match(struct acpi_device *device){
1261 acpi_handle phandle;
1263 handle = device->handle;
1265 status = acpi_get_handle(handle, "_EJ0", &tmp);
1266 if (ACPI_FAILURE(status))
1269 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1270 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1271 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1272 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1275 if (acpi_get_parent(handle, &phandle))
1278 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1279 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1280 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1281 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1288 * acpi_dock_match - see if a device has a _DCK method
1290 static int acpi_dock_match(struct acpi_device *device)
1293 return acpi_get_handle(device->handle, "_DCK", &tmp);
1296 const char *acpi_device_hid(struct acpi_device *device)
1298 struct acpi_hardware_id *hid;
1300 if (list_empty(&device->pnp.ids))
1303 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1306 EXPORT_SYMBOL(acpi_device_hid);
1308 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1310 struct acpi_hardware_id *id;
1312 id = kmalloc(sizeof(*id), GFP_KERNEL);
1316 id->id = kstrdup(dev_id, GFP_KERNEL);
1322 list_add_tail(&id->list, &device->pnp.ids);
1326 * Old IBM workstations have a DSDT bug wherein the SMBus object
1327 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1328 * prefix. Work around this.
1330 static int acpi_ibm_smbus_match(struct acpi_device *device)
1332 acpi_handle h_dummy;
1333 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1336 if (!dmi_name_in_vendors("IBM"))
1339 /* Look for SMBS object */
1340 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1344 if (strcmp("SMBS", path.pointer)) {
1349 /* Does it have the necessary (but misnamed) methods? */
1351 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1352 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1353 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1356 kfree(path.pointer);
1360 static void acpi_device_set_id(struct acpi_device *device)
1363 struct acpi_device_info *info;
1364 struct acpi_pnp_device_id_list *cid_list;
1367 switch (device->device_type) {
1368 case ACPI_BUS_TYPE_DEVICE:
1369 if (ACPI_IS_ROOT_DEVICE(device)) {
1370 acpi_add_id(device, ACPI_SYSTEM_HID);
1374 status = acpi_get_object_info(device->handle, &info);
1375 if (ACPI_FAILURE(status)) {
1376 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1380 if (info->valid & ACPI_VALID_HID)
1381 acpi_add_id(device, info->hardware_id.string);
1382 if (info->valid & ACPI_VALID_CID) {
1383 cid_list = &info->compatible_id_list;
1384 for (i = 0; i < cid_list->count; i++)
1385 acpi_add_id(device, cid_list->ids[i].string);
1387 if (info->valid & ACPI_VALID_ADR) {
1388 device->pnp.bus_address = info->address;
1389 device->flags.bus_address = 1;
1391 if (info->valid & ACPI_VALID_UID)
1392 device->pnp.unique_id = kstrdup(info->unique_id.string,
1398 * Some devices don't reliably have _HIDs & _CIDs, so add
1399 * synthetic HIDs to make sure drivers can find them.
1401 if (acpi_is_video_device(device))
1402 acpi_add_id(device, ACPI_VIDEO_HID);
1403 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1404 acpi_add_id(device, ACPI_BAY_HID);
1405 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1406 acpi_add_id(device, ACPI_DOCK_HID);
1407 else if (!acpi_ibm_smbus_match(device))
1408 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1409 else if (list_empty(&device->pnp.ids) &&
1410 ACPI_IS_ROOT_DEVICE(device->parent)) {
1411 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1412 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1413 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1417 case ACPI_BUS_TYPE_POWER:
1418 acpi_add_id(device, ACPI_POWER_HID);
1420 case ACPI_BUS_TYPE_PROCESSOR:
1421 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1423 case ACPI_BUS_TYPE_THERMAL:
1424 acpi_add_id(device, ACPI_THERMAL_HID);
1426 case ACPI_BUS_TYPE_POWER_BUTTON:
1427 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1429 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1430 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1435 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1436 int type, unsigned long long sta)
1438 INIT_LIST_HEAD(&device->pnp.ids);
1439 device->device_type = type;
1440 device->handle = handle;
1441 device->parent = acpi_bus_get_parent(handle);
1442 STRUCT_TO_INT(device->status) = sta;
1443 acpi_device_get_busid(device);
1444 acpi_device_set_id(device);
1445 acpi_bus_get_flags(device);
1446 device->flags.match_driver = false;
1447 device_initialize(&device->dev);
1448 dev_set_uevent_suppress(&device->dev, true);
1451 void acpi_device_add_finalize(struct acpi_device *device)
1453 device->flags.match_driver = true;
1454 dev_set_uevent_suppress(&device->dev, false);
1455 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1458 static int acpi_add_single_object(struct acpi_device **child,
1459 acpi_handle handle, int type,
1460 unsigned long long sta)
1463 struct acpi_device *device;
1464 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1466 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1468 printk(KERN_ERR PREFIX "Memory allocation error\n");
1472 acpi_init_device_object(device, handle, type, sta);
1473 acpi_bus_get_power_flags(device);
1474 acpi_bus_get_wakeup_device_flags(device);
1476 result = acpi_device_add(device, acpi_device_release);
1478 acpi_device_release(&device->dev);
1482 acpi_power_add_remove_device(device, true);
1483 acpi_device_add_finalize(device);
1484 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1485 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1486 dev_name(&device->dev), (char *) buffer.pointer,
1487 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1488 kfree(buffer.pointer);
1493 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1494 unsigned long long *sta)
1497 acpi_object_type acpi_type;
1499 status = acpi_get_type(handle, &acpi_type);
1500 if (ACPI_FAILURE(status))
1503 switch (acpi_type) {
1504 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1505 case ACPI_TYPE_DEVICE:
1506 *type = ACPI_BUS_TYPE_DEVICE;
1507 status = acpi_bus_get_status_handle(handle, sta);
1508 if (ACPI_FAILURE(status))
1511 case ACPI_TYPE_PROCESSOR:
1512 *type = ACPI_BUS_TYPE_PROCESSOR;
1513 status = acpi_bus_get_status_handle(handle, sta);
1514 if (ACPI_FAILURE(status))
1517 case ACPI_TYPE_THERMAL:
1518 *type = ACPI_BUS_TYPE_THERMAL;
1519 *sta = ACPI_STA_DEFAULT;
1521 case ACPI_TYPE_POWER:
1522 *type = ACPI_BUS_TYPE_POWER;
1523 *sta = ACPI_STA_DEFAULT;
1532 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1533 void *not_used, void **return_value)
1535 struct acpi_device *device = NULL;
1537 unsigned long long sta;
1541 acpi_bus_get_device(handle, &device);
1545 result = acpi_bus_type_and_status(handle, &type, &sta);
1549 if (type == ACPI_BUS_TYPE_POWER) {
1550 acpi_add_power_resource(handle);
1554 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1555 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1556 struct acpi_device_wakeup wakeup;
1559 status = acpi_get_handle(handle, "_PRW", &temp);
1560 if (ACPI_SUCCESS(status)) {
1561 acpi_bus_extract_wakeup_device_power_package(handle,
1563 acpi_power_resources_list_free(&wakeup.resources);
1565 return AE_CTRL_DEPTH;
1568 acpi_add_single_object(&device, handle, type, sta);
1570 return AE_CTRL_DEPTH;
1574 *return_value = device;
1579 static int acpi_scan_do_attach_handler(struct acpi_device *device, char *id)
1581 struct acpi_scan_handler *handler;
1583 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) {
1584 const struct acpi_device_id *devid;
1586 for (devid = handler->ids; devid->id[0]; devid++) {
1589 if (strcmp((char *)devid->id, id))
1592 ret = handler->attach(device, devid);
1594 device->handler = handler;
1596 } else if (ret < 0) {
1604 static int acpi_scan_attach_handler(struct acpi_device *device)
1606 struct acpi_hardware_id *hwid;
1609 list_for_each_entry(hwid, &device->pnp.ids, list) {
1610 ret = acpi_scan_do_attach_handler(device, hwid->id);
1618 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1619 void *not_used, void **ret_not_used)
1621 struct acpi_device *device;
1622 unsigned long long sta_not_used;
1626 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1627 * namespace walks prematurely.
1629 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1632 if (acpi_bus_get_device(handle, &device))
1633 return AE_CTRL_DEPTH;
1635 ret = acpi_scan_attach_handler(device);
1637 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1639 ret = device_attach(&device->dev);
1640 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1644 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1645 * @handle: Root of the namespace scope to scan.
1647 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1650 * If no devices were found, -ENODEV is returned, but it does not mean that
1651 * there has been a real error. There just have been no suitable ACPI objects
1652 * in the table trunk from which the kernel could create a device and add an
1653 * appropriate driver.
1655 * Must be called under acpi_scan_lock.
1657 int acpi_bus_scan(acpi_handle handle)
1659 void *device = NULL;
1662 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1663 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1664 acpi_bus_check_add, NULL, NULL, &device);
1668 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1669 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1670 acpi_bus_device_attach, NULL, NULL, NULL);
1674 EXPORT_SYMBOL(acpi_bus_scan);
1676 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1677 void *not_used, void **ret_not_used)
1679 struct acpi_device *device = NULL;
1681 if (!acpi_bus_get_device(handle, &device)) {
1682 struct acpi_scan_handler *dev_handler = device->handler;
1684 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1686 if (dev_handler->detach)
1687 dev_handler->detach(device);
1689 device->handler = NULL;
1691 device_release_driver(&device->dev);
1697 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1698 void *not_used, void **ret_not_used)
1700 struct acpi_device *device = NULL;
1702 if (!acpi_bus_get_device(handle, &device))
1703 acpi_device_unregister(device);
1709 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1710 * @start: Root of the ACPI device nodes subtree to remove.
1712 * Must be called under acpi_scan_lock.
1714 void acpi_bus_trim(struct acpi_device *start)
1717 * Execute acpi_bus_device_detach() as a post-order callback to detach
1718 * all ACPI drivers from the device nodes being removed.
1720 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1721 acpi_bus_device_detach, NULL, NULL);
1722 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1724 * Execute acpi_bus_remove() as a post-order callback to remove device
1725 * nodes in the given namespace scope.
1727 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1728 acpi_bus_remove, NULL, NULL);
1729 acpi_bus_remove(start->handle, 0, NULL, NULL);
1731 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1733 static int acpi_bus_scan_fixed(void)
1738 * Enumerate all fixed-feature devices.
1740 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1741 struct acpi_device *device = NULL;
1743 result = acpi_add_single_object(&device, NULL,
1744 ACPI_BUS_TYPE_POWER_BUTTON,
1749 result = device_attach(&device->dev);
1753 device_init_wakeup(&device->dev, true);
1756 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1757 struct acpi_device *device = NULL;
1759 result = acpi_add_single_object(&device, NULL,
1760 ACPI_BUS_TYPE_SLEEP_BUTTON,
1765 result = device_attach(&device->dev);
1768 return result < 0 ? result : 0;
1771 int __init acpi_scan_init(void)
1775 result = bus_register(&acpi_bus_type);
1777 /* We don't want to quit even if we failed to add suspend/resume */
1778 printk(KERN_ERR PREFIX "Could not register bus type\n");
1781 acpi_pci_root_init();
1782 acpi_pci_link_init();
1783 acpi_platform_init();
1785 acpi_container_init();
1787 mutex_lock(&acpi_scan_lock);
1789 * Enumerate devices in the ACPI namespace.
1791 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1795 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1799 result = acpi_bus_scan_fixed();
1801 acpi_device_unregister(acpi_root);
1805 acpi_update_all_gpes();
1808 mutex_unlock(&acpi_scan_lock);