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)
31 * If set, devices will be hot-removed even if they cannot be put offline
32 * gracefully (from the kernel's standpoint).
34 bool acpi_force_hot_remove;
36 static const char *dummy_hid = "device";
38 static LIST_HEAD(acpi_bus_id_list);
39 static DEFINE_MUTEX(acpi_scan_lock);
40 static LIST_HEAD(acpi_scan_handlers_list);
41 DEFINE_MUTEX(acpi_device_lock);
42 LIST_HEAD(acpi_wakeup_device_list);
44 struct acpi_device_bus_id{
46 unsigned int instance_no;
47 struct list_head node;
50 void acpi_scan_lock_acquire(void)
52 mutex_lock(&acpi_scan_lock);
54 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
56 void acpi_scan_lock_release(void)
58 mutex_unlock(&acpi_scan_lock);
60 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
62 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
64 if (!handler || !handler->attach)
67 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
71 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
72 const char *hotplug_profile_name)
76 error = acpi_scan_add_handler(handler);
80 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
85 * Creates hid/cid(s) string needed for modalias and uevent
86 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
87 * char *modalias: "acpi:IBM0001:ACPI0001"
89 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
94 struct acpi_hardware_id *id;
96 if (list_empty(&acpi_dev->pnp.ids))
99 len = snprintf(modalias, size, "acpi:");
102 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
103 count = snprintf(&modalias[len], size, "%s:", id->id);
104 if (count < 0 || count >= size)
110 modalias[len] = '\0';
115 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
116 struct acpi_device *acpi_dev = to_acpi_device(dev);
119 /* Device has no HID and no CID or string is >1024 */
120 len = create_modalias(acpi_dev, buf, 1024);
126 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
128 static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl,
129 void *data, void **ret_p)
131 struct acpi_device *device = NULL;
132 struct acpi_device_physical_node *pn;
133 bool second_pass = (bool)data;
134 acpi_status status = AE_OK;
136 if (acpi_bus_get_device(handle, &device))
139 mutex_lock(&device->physical_node_lock);
141 list_for_each_entry(pn, &device->physical_node_list, node) {
145 /* Skip devices offlined by the first pass. */
149 pn->put_online = false;
151 ret = device_offline(pn->dev);
152 if (acpi_force_hot_remove)
156 pn->put_online = !ret;
166 mutex_unlock(&device->physical_node_lock);
171 static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
172 void *data, void **ret_p)
174 struct acpi_device *device = NULL;
175 struct acpi_device_physical_node *pn;
177 if (acpi_bus_get_device(handle, &device))
180 mutex_lock(&device->physical_node_lock);
182 list_for_each_entry(pn, &device->physical_node_list, node)
183 if (pn->put_online) {
184 device_online(pn->dev);
185 pn->put_online = false;
188 mutex_unlock(&device->physical_node_lock);
193 static int acpi_scan_hot_remove(struct acpi_device *device)
195 acpi_handle handle = device->handle;
196 struct device *errdev;
198 unsigned long long sta;
200 /* If there is no handle, the device node has been unregistered. */
202 dev_dbg(&device->dev, "ACPI handle missing\n");
203 put_device(&device->dev);
207 lock_device_hotplug();
210 * Carry out two passes here and ignore errors in the first pass,
211 * because if the devices in question are memory blocks and
212 * CONFIG_MEMCG is set, one of the blocks may hold data structures
213 * that the other blocks depend on, but it is not known in advance which
216 * If the first pass is successful, the second one isn't needed, though.
219 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
220 NULL, acpi_bus_offline_companions,
221 (void *)false, (void **)&errdev);
222 acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
225 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
226 NULL, acpi_bus_offline_companions,
227 (void *)true , (void **)&errdev);
228 if (!errdev || acpi_force_hot_remove)
229 acpi_bus_offline_companions(handle, 0, (void *)true,
232 if (errdev && !acpi_force_hot_remove) {
233 dev_warn(errdev, "Offline failed.\n");
234 acpi_bus_online_companions(handle, 0, NULL, NULL);
235 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
237 acpi_bus_online_companions, NULL,
240 unlock_device_hotplug();
242 put_device(&device->dev);
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
248 "Hot-removing device %s...\n", dev_name(&device->dev)));
250 acpi_bus_trim(device);
252 unlock_device_hotplug();
254 /* Device node has been unregistered. */
255 put_device(&device->dev);
258 acpi_evaluate_lck(handle, 0);
262 status = acpi_evaluate_ej0(handle);
263 if (status == AE_NOT_FOUND)
265 else if (ACPI_FAILURE(status))
269 * Verify if eject was indeed successful. If not, log an error
270 * message. No need to call _OST since _EJ0 call was made OK.
272 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
273 if (ACPI_FAILURE(status)) {
274 acpi_handle_warn(handle,
275 "Status check after eject failed (0x%x)\n", status);
276 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
277 acpi_handle_warn(handle,
278 "Eject incomplete - status 0x%llx\n", sta);
284 static void acpi_bus_device_eject(void *context)
286 acpi_handle handle = context;
287 struct acpi_device *device = NULL;
288 struct acpi_scan_handler *handler;
289 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
291 mutex_lock(&acpi_scan_lock);
293 acpi_bus_get_device(handle, &device);
297 handler = device->handler;
298 if (!handler || !handler->hotplug.enabled) {
299 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
302 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
303 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
304 if (handler->hotplug.mode == AHM_CONTAINER) {
305 device->flags.eject_pending = true;
306 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
310 get_device(&device->dev);
311 error = acpi_scan_hot_remove(device);
317 mutex_unlock(&acpi_scan_lock);
321 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
326 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
328 struct acpi_device *device = NULL;
329 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
332 mutex_lock(&acpi_scan_lock);
333 lock_device_hotplug();
335 if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
336 acpi_bus_get_device(handle, &device);
338 dev_warn(&device->dev, "Attempt to re-insert\n");
342 acpi_evaluate_hotplug_ost(handle, ost_source,
343 ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
344 error = acpi_bus_scan(handle);
346 acpi_handle_warn(handle, "Namespace scan failure\n");
349 error = acpi_bus_get_device(handle, &device);
351 acpi_handle_warn(handle, "Missing device node object\n");
354 ost_code = ACPI_OST_SC_SUCCESS;
355 if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
356 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
359 unlock_device_hotplug();
360 acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
361 mutex_unlock(&acpi_scan_lock);
364 static void acpi_scan_bus_check(void *context)
366 acpi_scan_bus_device_check((acpi_handle)context,
367 ACPI_NOTIFY_BUS_CHECK);
370 static void acpi_scan_device_check(void *context)
372 acpi_scan_bus_device_check((acpi_handle)context,
373 ACPI_NOTIFY_DEVICE_CHECK);
376 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
381 case ACPI_NOTIFY_BUS_CHECK:
382 acpi_handle_debug(handle,
383 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
384 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
386 case ACPI_NOTIFY_DEVICE_CHECK:
387 acpi_handle_debug(handle,
388 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
389 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
391 case ACPI_NOTIFY_EJECT_REQUEST:
392 acpi_handle_debug(handle,
393 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
394 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
397 /* non-hotplug event; possibly handled by other handler */
401 acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
404 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
406 acpi_osd_exec_callback callback;
407 struct acpi_scan_handler *handler = data;
410 if (!handler->hotplug.enabled)
411 return acpi_hotplug_unsupported(handle, type);
414 case ACPI_NOTIFY_BUS_CHECK:
415 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
416 callback = acpi_scan_bus_check;
418 case ACPI_NOTIFY_DEVICE_CHECK:
419 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
420 callback = acpi_scan_device_check;
422 case ACPI_NOTIFY_EJECT_REQUEST:
423 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
424 callback = acpi_bus_device_eject;
427 /* non-hotplug event; possibly handled by other handler */
430 status = acpi_os_hotplug_execute(callback, handle);
431 if (ACPI_FAILURE(status))
432 acpi_evaluate_hotplug_ost(handle, type,
433 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
438 * acpi_bus_hot_remove_device: hot-remove a device and its children
439 * @context: struct acpi_eject_event pointer (freed in this func)
441 * Hot-remove a device and its children. This function frees up the
442 * memory space passed by arg context, so that the caller may call
443 * this function asynchronously through acpi_os_hotplug_execute().
445 void acpi_bus_hot_remove_device(void *context)
447 struct acpi_eject_event *ej_event = context;
448 struct acpi_device *device = ej_event->device;
449 acpi_handle handle = device->handle;
452 mutex_lock(&acpi_scan_lock);
454 error = acpi_scan_hot_remove(device);
456 acpi_evaluate_hotplug_ost(handle, ej_event->event,
457 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
460 mutex_unlock(&acpi_scan_lock);
463 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
465 static ssize_t real_power_state_show(struct device *dev,
466 struct device_attribute *attr, char *buf)
468 struct acpi_device *adev = to_acpi_device(dev);
472 ret = acpi_device_get_power(adev, &state);
476 return sprintf(buf, "%s\n", acpi_power_state_string(state));
479 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
481 static ssize_t power_state_show(struct device *dev,
482 struct device_attribute *attr, char *buf)
484 struct acpi_device *adev = to_acpi_device(dev);
486 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
489 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
492 acpi_eject_store(struct device *d, struct device_attribute *attr,
493 const char *buf, size_t count)
495 struct acpi_device *acpi_device = to_acpi_device(d);
496 struct acpi_eject_event *ej_event;
497 acpi_object_type not_used;
502 if (!count || buf[0] != '1')
505 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
506 && !acpi_device->driver)
509 status = acpi_get_type(acpi_device->handle, ¬_used);
510 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
513 mutex_lock(&acpi_scan_lock);
515 if (acpi_device->flags.eject_pending) {
516 /* ACPI eject notification event. */
517 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
518 acpi_device->flags.eject_pending = 0;
520 /* Eject initiated by user space. */
521 ost_source = ACPI_OST_EC_OSPM_EJECT;
523 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
528 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
529 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
530 ej_event->device = acpi_device;
531 ej_event->event = ost_source;
532 get_device(&acpi_device->dev);
533 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
534 if (ACPI_FAILURE(status)) {
535 put_device(&acpi_device->dev);
537 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
543 mutex_unlock(&acpi_scan_lock);
547 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
548 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
552 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
555 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
556 struct acpi_device *acpi_dev = to_acpi_device(dev);
558 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
560 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
562 static ssize_t acpi_device_uid_show(struct device *dev,
563 struct device_attribute *attr, char *buf)
565 struct acpi_device *acpi_dev = to_acpi_device(dev);
567 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
569 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
571 static ssize_t acpi_device_adr_show(struct device *dev,
572 struct device_attribute *attr, char *buf)
574 struct acpi_device *acpi_dev = to_acpi_device(dev);
576 return sprintf(buf, "0x%08x\n",
577 (unsigned int)(acpi_dev->pnp.bus_address));
579 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
582 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
583 struct acpi_device *acpi_dev = to_acpi_device(dev);
584 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
587 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
591 result = sprintf(buf, "%s\n", (char*)path.pointer);
596 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
598 /* sysfs file that shows description text from the ACPI _STR method */
599 static ssize_t description_show(struct device *dev,
600 struct device_attribute *attr,
602 struct acpi_device *acpi_dev = to_acpi_device(dev);
605 if (acpi_dev->pnp.str_obj == NULL)
609 * The _STR object contains a Unicode identifier for a device.
610 * We need to convert to utf-8 so it can be displayed.
612 result = utf16s_to_utf8s(
613 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
614 acpi_dev->pnp.str_obj->buffer.length,
615 UTF16_LITTLE_ENDIAN, buf,
618 buf[result++] = '\n';
622 static DEVICE_ATTR(description, 0444, description_show, NULL);
625 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
627 struct acpi_device *acpi_dev = to_acpi_device(dev);
629 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
631 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
633 static int acpi_device_setup_files(struct acpi_device *dev)
635 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
637 unsigned long long sun;
641 * Devices gotten from FADT don't have a "path" attribute
644 result = device_create_file(&dev->dev, &dev_attr_path);
649 if (!list_empty(&dev->pnp.ids)) {
650 result = device_create_file(&dev->dev, &dev_attr_hid);
654 result = device_create_file(&dev->dev, &dev_attr_modalias);
660 * If device has _STR, 'description' file is created
662 if (acpi_has_method(dev->handle, "_STR")) {
663 status = acpi_evaluate_object(dev->handle, "_STR",
665 if (ACPI_FAILURE(status))
666 buffer.pointer = NULL;
667 dev->pnp.str_obj = buffer.pointer;
668 result = device_create_file(&dev->dev, &dev_attr_description);
673 if (dev->pnp.type.bus_address)
674 result = device_create_file(&dev->dev, &dev_attr_adr);
675 if (dev->pnp.unique_id)
676 result = device_create_file(&dev->dev, &dev_attr_uid);
678 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
679 if (ACPI_SUCCESS(status)) {
680 dev->pnp.sun = (unsigned long)sun;
681 result = device_create_file(&dev->dev, &dev_attr_sun);
685 dev->pnp.sun = (unsigned long)-1;
689 * If device has _EJ0, 'eject' file is created that is used to trigger
690 * hot-removal function from userland.
692 if (acpi_has_method(dev->handle, "_EJ0")) {
693 result = device_create_file(&dev->dev, &dev_attr_eject);
698 if (dev->flags.power_manageable) {
699 result = device_create_file(&dev->dev, &dev_attr_power_state);
703 if (dev->power.flags.power_resources)
704 result = device_create_file(&dev->dev,
705 &dev_attr_real_power_state);
712 static void acpi_device_remove_files(struct acpi_device *dev)
714 if (dev->flags.power_manageable) {
715 device_remove_file(&dev->dev, &dev_attr_power_state);
716 if (dev->power.flags.power_resources)
717 device_remove_file(&dev->dev,
718 &dev_attr_real_power_state);
722 * If device has _STR, remove 'description' file
724 if (acpi_has_method(dev->handle, "_STR")) {
725 kfree(dev->pnp.str_obj);
726 device_remove_file(&dev->dev, &dev_attr_description);
729 * If device has _EJ0, remove 'eject' file.
731 if (acpi_has_method(dev->handle, "_EJ0"))
732 device_remove_file(&dev->dev, &dev_attr_eject);
734 if (acpi_has_method(dev->handle, "_SUN"))
735 device_remove_file(&dev->dev, &dev_attr_sun);
737 if (dev->pnp.unique_id)
738 device_remove_file(&dev->dev, &dev_attr_uid);
739 if (dev->pnp.type.bus_address)
740 device_remove_file(&dev->dev, &dev_attr_adr);
741 device_remove_file(&dev->dev, &dev_attr_modalias);
742 device_remove_file(&dev->dev, &dev_attr_hid);
744 device_remove_file(&dev->dev, &dev_attr_path);
746 /* --------------------------------------------------------------------------
748 -------------------------------------------------------------------------- */
750 static const struct acpi_device_id *__acpi_match_device(
751 struct acpi_device *device, const struct acpi_device_id *ids)
753 const struct acpi_device_id *id;
754 struct acpi_hardware_id *hwid;
757 * If the device is not present, it is unnecessary to load device
760 if (!device->status.present)
763 for (id = ids; id->id[0]; id++)
764 list_for_each_entry(hwid, &device->pnp.ids, list)
765 if (!strcmp((char *) id->id, hwid->id))
772 * acpi_match_device - Match a struct device against a given list of ACPI IDs
773 * @ids: Array of struct acpi_device_id object to match against.
774 * @dev: The device structure to match.
776 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
777 * object for that handle and use that object to match against a given list of
780 * Return a pointer to the first matching ID on success or %NULL on failure.
782 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
783 const struct device *dev)
785 struct acpi_device *adev;
786 acpi_handle handle = ACPI_HANDLE(dev);
788 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
791 return __acpi_match_device(adev, ids);
793 EXPORT_SYMBOL_GPL(acpi_match_device);
795 int acpi_match_device_ids(struct acpi_device *device,
796 const struct acpi_device_id *ids)
798 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
800 EXPORT_SYMBOL(acpi_match_device_ids);
802 static void acpi_free_power_resources_lists(struct acpi_device *device)
806 if (device->wakeup.flags.valid)
807 acpi_power_resources_list_free(&device->wakeup.resources);
809 if (!device->flags.power_manageable)
812 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
813 struct acpi_device_power_state *ps = &device->power.states[i];
814 acpi_power_resources_list_free(&ps->resources);
818 static void acpi_device_release(struct device *dev)
820 struct acpi_device *acpi_dev = to_acpi_device(dev);
822 acpi_free_pnp_ids(&acpi_dev->pnp);
823 acpi_free_power_resources_lists(acpi_dev);
827 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
829 struct acpi_device *acpi_dev = to_acpi_device(dev);
830 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
832 return acpi_dev->flags.match_driver
833 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
836 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
838 struct acpi_device *acpi_dev = to_acpi_device(dev);
841 if (list_empty(&acpi_dev->pnp.ids))
844 if (add_uevent_var(env, "MODALIAS="))
846 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
847 sizeof(env->buf) - env->buflen);
848 if (len >= (sizeof(env->buf) - env->buflen))
854 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
856 struct acpi_device *device = data;
858 device->driver->ops.notify(device, event);
861 static acpi_status acpi_device_notify_fixed(void *data)
863 struct acpi_device *device = data;
865 /* Fixed hardware devices have no handles */
866 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
870 static int acpi_device_install_notify_handler(struct acpi_device *device)
874 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
876 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
877 acpi_device_notify_fixed,
879 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
881 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
882 acpi_device_notify_fixed,
885 status = acpi_install_notify_handler(device->handle,
890 if (ACPI_FAILURE(status))
895 static void acpi_device_remove_notify_handler(struct acpi_device *device)
897 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
898 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
899 acpi_device_notify_fixed);
900 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
901 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
902 acpi_device_notify_fixed);
904 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
908 static int acpi_device_probe(struct device *dev)
910 struct acpi_device *acpi_dev = to_acpi_device(dev);
911 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
914 if (acpi_dev->handler)
917 if (!acpi_drv->ops.add)
920 ret = acpi_drv->ops.add(acpi_dev);
924 acpi_dev->driver = acpi_drv;
925 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
926 "Driver [%s] successfully bound to device [%s]\n",
927 acpi_drv->name, acpi_dev->pnp.bus_id));
929 if (acpi_drv->ops.notify) {
930 ret = acpi_device_install_notify_handler(acpi_dev);
932 if (acpi_drv->ops.remove)
933 acpi_drv->ops.remove(acpi_dev);
935 acpi_dev->driver = NULL;
936 acpi_dev->driver_data = NULL;
941 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
942 acpi_drv->name, acpi_dev->pnp.bus_id));
947 static int acpi_device_remove(struct device * dev)
949 struct acpi_device *acpi_dev = to_acpi_device(dev);
950 struct acpi_driver *acpi_drv = acpi_dev->driver;
953 if (acpi_drv->ops.notify)
954 acpi_device_remove_notify_handler(acpi_dev);
955 if (acpi_drv->ops.remove)
956 acpi_drv->ops.remove(acpi_dev);
958 acpi_dev->driver = NULL;
959 acpi_dev->driver_data = NULL;
965 struct bus_type acpi_bus_type = {
967 .match = acpi_bus_match,
968 .probe = acpi_device_probe,
969 .remove = acpi_device_remove,
970 .uevent = acpi_device_uevent,
973 int acpi_device_add(struct acpi_device *device,
974 void (*release)(struct device *))
977 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
980 if (device->handle) {
983 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
985 if (ACPI_FAILURE(status)) {
986 acpi_handle_err(device->handle,
987 "Unable to attach device data\n");
995 * Link this device to its parent and siblings.
997 INIT_LIST_HEAD(&device->children);
998 INIT_LIST_HEAD(&device->node);
999 INIT_LIST_HEAD(&device->wakeup_list);
1000 INIT_LIST_HEAD(&device->physical_node_list);
1001 mutex_init(&device->physical_node_lock);
1002 INIT_LIST_HEAD(&device->power_dependent);
1004 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1006 pr_err(PREFIX "Memory allocation error\n");
1011 mutex_lock(&acpi_device_lock);
1013 * Find suitable bus_id and instance number in acpi_bus_id_list
1014 * If failed, create one and link it into acpi_bus_id_list
1016 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1017 if (!strcmp(acpi_device_bus_id->bus_id,
1018 acpi_device_hid(device))) {
1019 acpi_device_bus_id->instance_no++;
1026 acpi_device_bus_id = new_bus_id;
1027 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1028 acpi_device_bus_id->instance_no = 0;
1029 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1031 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1034 list_add_tail(&device->node, &device->parent->children);
1036 if (device->wakeup.flags.valid)
1037 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1038 mutex_unlock(&acpi_device_lock);
1041 device->dev.parent = &device->parent->dev;
1042 device->dev.bus = &acpi_bus_type;
1043 device->dev.release = release;
1044 result = device_add(&device->dev);
1046 dev_err(&device->dev, "Error registering device\n");
1050 result = acpi_device_setup_files(device);
1052 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1053 dev_name(&device->dev));
1058 mutex_lock(&acpi_device_lock);
1060 list_del(&device->node);
1061 list_del(&device->wakeup_list);
1062 mutex_unlock(&acpi_device_lock);
1065 acpi_detach_data(device->handle, acpi_bus_data_handler);
1069 static void acpi_device_unregister(struct acpi_device *device)
1071 mutex_lock(&acpi_device_lock);
1073 list_del(&device->node);
1075 list_del(&device->wakeup_list);
1076 mutex_unlock(&acpi_device_lock);
1078 acpi_detach_data(device->handle, acpi_bus_data_handler);
1080 acpi_power_add_remove_device(device, false);
1081 acpi_device_remove_files(device);
1083 device->remove(device);
1085 device_del(&device->dev);
1087 * Transition the device to D3cold to drop the reference counts of all
1088 * power resources the device depends on and turn off the ones that have
1089 * no more references.
1091 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1092 device->handle = NULL;
1093 put_device(&device->dev);
1096 /* --------------------------------------------------------------------------
1098 -------------------------------------------------------------------------- */
1100 * acpi_bus_register_driver - register a driver with the ACPI bus
1101 * @driver: driver being registered
1103 * Registers a driver with the ACPI bus. Searches the namespace for all
1104 * devices that match the driver's criteria and binds. Returns zero for
1105 * success or a negative error status for failure.
1107 int acpi_bus_register_driver(struct acpi_driver *driver)
1113 driver->drv.name = driver->name;
1114 driver->drv.bus = &acpi_bus_type;
1115 driver->drv.owner = driver->owner;
1117 ret = driver_register(&driver->drv);
1121 EXPORT_SYMBOL(acpi_bus_register_driver);
1124 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1125 * @driver: driver to unregister
1127 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1128 * devices that match the driver's criteria and unbinds.
1130 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1132 driver_unregister(&driver->drv);
1135 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1137 /* --------------------------------------------------------------------------
1139 -------------------------------------------------------------------------- */
1140 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1142 struct acpi_device *device = NULL;
1146 * Fixed hardware devices do not appear in the namespace and do not
1147 * have handles, but we fabricate acpi_devices for them, so we have
1148 * to deal with them specially.
1154 status = acpi_get_parent(handle, &handle);
1155 if (ACPI_FAILURE(status))
1156 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1157 } while (acpi_bus_get_device(handle, &device));
1162 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1166 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1167 union acpi_object *obj;
1169 status = acpi_get_handle(handle, "_EJD", &tmp);
1170 if (ACPI_FAILURE(status))
1173 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1174 if (ACPI_SUCCESS(status)) {
1175 obj = buffer.pointer;
1176 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1178 kfree(buffer.pointer);
1182 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1184 void acpi_bus_data_handler(acpi_handle handle, void *context)
1192 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1193 struct acpi_device_wakeup *wakeup)
1195 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1196 union acpi_object *package = NULL;
1197 union acpi_object *element = NULL;
1204 INIT_LIST_HEAD(&wakeup->resources);
1207 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1208 if (ACPI_FAILURE(status)) {
1209 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1213 package = (union acpi_object *)buffer.pointer;
1215 if (!package || package->package.count < 2)
1218 element = &(package->package.elements[0]);
1222 if (element->type == ACPI_TYPE_PACKAGE) {
1223 if ((element->package.count < 2) ||
1224 (element->package.elements[0].type !=
1225 ACPI_TYPE_LOCAL_REFERENCE)
1226 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1229 wakeup->gpe_device =
1230 element->package.elements[0].reference.handle;
1231 wakeup->gpe_number =
1232 (u32) element->package.elements[1].integer.value;
1233 } else if (element->type == ACPI_TYPE_INTEGER) {
1234 wakeup->gpe_device = NULL;
1235 wakeup->gpe_number = element->integer.value;
1240 element = &(package->package.elements[1]);
1241 if (element->type != ACPI_TYPE_INTEGER)
1244 wakeup->sleep_state = element->integer.value;
1246 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1250 if (!list_empty(&wakeup->resources)) {
1253 err = acpi_power_wakeup_list_init(&wakeup->resources,
1256 acpi_handle_warn(handle, "Retrieving current states "
1257 "of wakeup power resources failed\n");
1258 acpi_power_resources_list_free(&wakeup->resources);
1261 if (sleep_state < wakeup->sleep_state) {
1262 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1263 "(S%d) by S%d from power resources\n",
1264 (int)wakeup->sleep_state, sleep_state);
1265 wakeup->sleep_state = sleep_state;
1268 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1271 kfree(buffer.pointer);
1275 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1277 struct acpi_device_id button_device_ids[] = {
1284 acpi_event_status event_status;
1286 device->wakeup.flags.notifier_present = 0;
1288 /* Power button, Lid switch always enable wakeup */
1289 if (!acpi_match_device_ids(device, button_device_ids)) {
1290 device->wakeup.flags.run_wake = 1;
1291 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1292 /* Do not use Lid/sleep button for S5 wakeup */
1293 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1294 device->wakeup.sleep_state = ACPI_STATE_S4;
1296 device_set_wakeup_capable(&device->dev, true);
1300 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1301 device->wakeup.gpe_number,
1303 if (status == AE_OK)
1304 device->wakeup.flags.run_wake =
1305 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1308 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1312 /* Presence of _PRW indicates wake capable */
1313 if (!acpi_has_method(device->handle, "_PRW"))
1316 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1319 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1323 device->wakeup.flags.valid = 1;
1324 device->wakeup.prepare_count = 0;
1325 acpi_bus_set_run_wake_flags(device);
1326 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1327 * system for the ACPI device with the _PRW object.
1328 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1329 * So it is necessary to call _DSW object first. Only when it is not
1330 * present will the _PSW object used.
1332 err = acpi_device_sleep_wake(device, 0, 0, 0);
1334 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1335 "error in _DSW or _PSW evaluation\n"));
1338 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1340 struct acpi_device_power_state *ps = &device->power.states[state];
1341 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1342 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1345 INIT_LIST_HEAD(&ps->resources);
1347 /* Evaluate "_PRx" to get referenced power resources */
1348 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1349 if (ACPI_SUCCESS(status)) {
1350 union acpi_object *package = buffer.pointer;
1352 if (buffer.length && package
1353 && package->type == ACPI_TYPE_PACKAGE
1354 && package->package.count) {
1355 int err = acpi_extract_power_resources(package, 0,
1358 device->power.flags.power_resources = 1;
1360 ACPI_FREE(buffer.pointer);
1363 /* Evaluate "_PSx" to see if we can do explicit sets */
1365 if (acpi_has_method(device->handle, pathname))
1366 ps->flags.explicit_set = 1;
1369 * State is valid if there are means to put the device into it.
1370 * D3hot is only valid if _PR3 present.
1372 if (!list_empty(&ps->resources)
1373 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1374 ps->flags.valid = 1;
1375 ps->flags.os_accessible = 1;
1378 ps->power = -1; /* Unknown - driver assigned */
1379 ps->latency = -1; /* Unknown - driver assigned */
1382 static void acpi_bus_get_power_flags(struct acpi_device *device)
1386 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1387 if (!acpi_has_method(device->handle, "_PS0") &&
1388 !acpi_has_method(device->handle, "_PR0"))
1391 device->flags.power_manageable = 1;
1394 * Power Management Flags
1396 if (acpi_has_method(device->handle, "_PSC"))
1397 device->power.flags.explicit_get = 1;
1398 if (acpi_has_method(device->handle, "_IRC"))
1399 device->power.flags.inrush_current = 1;
1402 * Enumerate supported power management states
1404 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1405 acpi_bus_init_power_state(device, i);
1407 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1409 /* Set defaults for D0 and D3 states (always valid) */
1410 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1411 device->power.states[ACPI_STATE_D0].power = 100;
1412 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1413 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1415 /* Set D3cold's explicit_set flag if _PS3 exists. */
1416 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1417 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1419 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1420 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1421 device->power.flags.power_resources)
1422 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1424 if (acpi_bus_init_power(device)) {
1425 acpi_free_power_resources_lists(device);
1426 device->flags.power_manageable = 0;
1430 static void acpi_bus_get_flags(struct acpi_device *device)
1432 /* Presence of _STA indicates 'dynamic_status' */
1433 if (acpi_has_method(device->handle, "_STA"))
1434 device->flags.dynamic_status = 1;
1436 /* Presence of _RMV indicates 'removable' */
1437 if (acpi_has_method(device->handle, "_RMV"))
1438 device->flags.removable = 1;
1440 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1441 if (acpi_has_method(device->handle, "_EJD") ||
1442 acpi_has_method(device->handle, "_EJ0"))
1443 device->flags.ejectable = 1;
1446 static void acpi_device_get_busid(struct acpi_device *device)
1448 char bus_id[5] = { '?', 0 };
1449 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1455 * The device's Bus ID is simply the object name.
1456 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1458 if (ACPI_IS_ROOT_DEVICE(device)) {
1459 strcpy(device->pnp.bus_id, "ACPI");
1463 switch (device->device_type) {
1464 case ACPI_BUS_TYPE_POWER_BUTTON:
1465 strcpy(device->pnp.bus_id, "PWRF");
1467 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1468 strcpy(device->pnp.bus_id, "SLPF");
1471 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1472 /* Clean up trailing underscores (if any) */
1473 for (i = 3; i > 1; i--) {
1474 if (bus_id[i] == '_')
1479 strcpy(device->pnp.bus_id, bus_id);
1485 * acpi_ata_match - see if an acpi object is an ATA device
1487 * If an acpi object has one of the ACPI ATA methods defined,
1488 * then we can safely call it an ATA device.
1490 bool acpi_ata_match(acpi_handle handle)
1492 return acpi_has_method(handle, "_GTF") ||
1493 acpi_has_method(handle, "_GTM") ||
1494 acpi_has_method(handle, "_STM") ||
1495 acpi_has_method(handle, "_SDD");
1499 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1501 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1502 * then we can safely call it an ejectable drive bay
1504 bool acpi_bay_match(acpi_handle handle)
1506 acpi_handle phandle;
1508 if (!acpi_has_method(handle, "_EJ0"))
1510 if (acpi_ata_match(handle))
1512 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1515 return acpi_ata_match(phandle);
1519 * acpi_dock_match - see if an acpi object has a _DCK method
1521 bool acpi_dock_match(acpi_handle handle)
1523 return acpi_has_method(handle, "_DCK");
1526 const char *acpi_device_hid(struct acpi_device *device)
1528 struct acpi_hardware_id *hid;
1530 if (list_empty(&device->pnp.ids))
1533 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1536 EXPORT_SYMBOL(acpi_device_hid);
1538 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1540 struct acpi_hardware_id *id;
1542 id = kmalloc(sizeof(*id), GFP_KERNEL);
1546 id->id = kstrdup(dev_id, GFP_KERNEL);
1552 list_add_tail(&id->list, &pnp->ids);
1553 pnp->type.hardware_id = 1;
1557 * Old IBM workstations have a DSDT bug wherein the SMBus object
1558 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1559 * prefix. Work around this.
1561 static bool acpi_ibm_smbus_match(acpi_handle handle)
1563 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1564 struct acpi_buffer path = { sizeof(node_name), node_name };
1566 if (!dmi_name_in_vendors("IBM"))
1569 /* Look for SMBS object */
1570 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1571 strcmp("SMBS", path.pointer))
1574 /* Does it have the necessary (but misnamed) methods? */
1575 if (acpi_has_method(handle, "SBI") &&
1576 acpi_has_method(handle, "SBR") &&
1577 acpi_has_method(handle, "SBW"))
1583 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1587 struct acpi_device_info *info;
1588 struct acpi_pnp_device_id_list *cid_list;
1591 switch (device_type) {
1592 case ACPI_BUS_TYPE_DEVICE:
1593 if (handle == ACPI_ROOT_OBJECT) {
1594 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1598 status = acpi_get_object_info(handle, &info);
1599 if (ACPI_FAILURE(status)) {
1600 pr_err(PREFIX "%s: Error reading device info\n",
1605 if (info->valid & ACPI_VALID_HID)
1606 acpi_add_id(pnp, info->hardware_id.string);
1607 if (info->valid & ACPI_VALID_CID) {
1608 cid_list = &info->compatible_id_list;
1609 for (i = 0; i < cid_list->count; i++)
1610 acpi_add_id(pnp, cid_list->ids[i].string);
1612 if (info->valid & ACPI_VALID_ADR) {
1613 pnp->bus_address = info->address;
1614 pnp->type.bus_address = 1;
1616 if (info->valid & ACPI_VALID_UID)
1617 pnp->unique_id = kstrdup(info->unique_id.string,
1623 * Some devices don't reliably have _HIDs & _CIDs, so add
1624 * synthetic HIDs to make sure drivers can find them.
1626 if (acpi_is_video_device(handle))
1627 acpi_add_id(pnp, ACPI_VIDEO_HID);
1628 else if (acpi_bay_match(handle))
1629 acpi_add_id(pnp, ACPI_BAY_HID);
1630 else if (acpi_dock_match(handle))
1631 acpi_add_id(pnp, ACPI_DOCK_HID);
1632 else if (acpi_ibm_smbus_match(handle))
1633 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1634 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1635 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1636 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1637 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1641 case ACPI_BUS_TYPE_POWER:
1642 acpi_add_id(pnp, ACPI_POWER_HID);
1644 case ACPI_BUS_TYPE_PROCESSOR:
1645 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1647 case ACPI_BUS_TYPE_THERMAL:
1648 acpi_add_id(pnp, ACPI_THERMAL_HID);
1650 case ACPI_BUS_TYPE_POWER_BUTTON:
1651 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1653 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1654 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1659 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1661 struct acpi_hardware_id *id, *tmp;
1663 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1667 kfree(pnp->unique_id);
1670 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1671 int type, unsigned long long sta)
1673 INIT_LIST_HEAD(&device->pnp.ids);
1674 device->device_type = type;
1675 device->handle = handle;
1676 device->parent = acpi_bus_get_parent(handle);
1677 STRUCT_TO_INT(device->status) = sta;
1678 acpi_device_get_busid(device);
1679 acpi_set_pnp_ids(handle, &device->pnp, type);
1680 acpi_bus_get_flags(device);
1681 device->flags.match_driver = false;
1682 device_initialize(&device->dev);
1683 dev_set_uevent_suppress(&device->dev, true);
1686 void acpi_device_add_finalize(struct acpi_device *device)
1688 device->flags.match_driver = true;
1689 dev_set_uevent_suppress(&device->dev, false);
1690 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1693 static int acpi_add_single_object(struct acpi_device **child,
1694 acpi_handle handle, int type,
1695 unsigned long long sta)
1698 struct acpi_device *device;
1699 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1701 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1703 printk(KERN_ERR PREFIX "Memory allocation error\n");
1707 acpi_init_device_object(device, handle, type, sta);
1708 acpi_bus_get_power_flags(device);
1709 acpi_bus_get_wakeup_device_flags(device);
1711 result = acpi_device_add(device, acpi_device_release);
1713 acpi_device_release(&device->dev);
1717 acpi_power_add_remove_device(device, true);
1718 acpi_device_add_finalize(device);
1719 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1720 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1721 dev_name(&device->dev), (char *) buffer.pointer,
1722 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1723 kfree(buffer.pointer);
1728 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1729 unsigned long long *sta)
1732 acpi_object_type acpi_type;
1734 status = acpi_get_type(handle, &acpi_type);
1735 if (ACPI_FAILURE(status))
1738 switch (acpi_type) {
1739 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1740 case ACPI_TYPE_DEVICE:
1741 *type = ACPI_BUS_TYPE_DEVICE;
1742 status = acpi_bus_get_status_handle(handle, sta);
1743 if (ACPI_FAILURE(status))
1746 case ACPI_TYPE_PROCESSOR:
1747 *type = ACPI_BUS_TYPE_PROCESSOR;
1748 status = acpi_bus_get_status_handle(handle, sta);
1749 if (ACPI_FAILURE(status))
1752 case ACPI_TYPE_THERMAL:
1753 *type = ACPI_BUS_TYPE_THERMAL;
1754 *sta = ACPI_STA_DEFAULT;
1756 case ACPI_TYPE_POWER:
1757 *type = ACPI_BUS_TYPE_POWER;
1758 *sta = ACPI_STA_DEFAULT;
1767 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1769 const struct acpi_device_id **matchid)
1771 const struct acpi_device_id *devid;
1773 for (devid = handler->ids; devid->id[0]; devid++)
1774 if (!strcmp((char *)devid->id, idstr)) {
1784 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1785 const struct acpi_device_id **matchid)
1787 struct acpi_scan_handler *handler;
1789 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1790 if (acpi_scan_handler_matching(handler, idstr, matchid))
1796 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1798 if (!!hotplug->enabled == !!val)
1801 mutex_lock(&acpi_scan_lock);
1803 hotplug->enabled = val;
1805 mutex_unlock(&acpi_scan_lock);
1808 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1810 struct acpi_device_pnp pnp = {};
1811 struct acpi_hardware_id *hwid;
1812 struct acpi_scan_handler *handler;
1814 INIT_LIST_HEAD(&pnp.ids);
1815 acpi_set_pnp_ids(handle, &pnp, type);
1817 if (!pnp.type.hardware_id)
1821 * This relies on the fact that acpi_install_notify_handler() will not
1822 * install the same notify handler routine twice for the same handle.
1824 list_for_each_entry(hwid, &pnp.ids, list) {
1825 handler = acpi_scan_match_handler(hwid->id, NULL);
1827 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1828 acpi_hotplug_notify_cb, handler);
1834 acpi_free_pnp_ids(&pnp);
1837 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1838 void *not_used, void **return_value)
1840 struct acpi_device *device = NULL;
1842 unsigned long long sta;
1845 acpi_bus_get_device(handle, &device);
1849 result = acpi_bus_type_and_status(handle, &type, &sta);
1853 if (type == ACPI_BUS_TYPE_POWER) {
1854 acpi_add_power_resource(handle);
1858 acpi_scan_init_hotplug(handle, type);
1860 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1861 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1862 struct acpi_device_wakeup wakeup;
1864 if (acpi_has_method(handle, "_PRW")) {
1865 acpi_bus_extract_wakeup_device_power_package(handle,
1867 acpi_power_resources_list_free(&wakeup.resources);
1869 return AE_CTRL_DEPTH;
1872 acpi_add_single_object(&device, handle, type, sta);
1874 return AE_CTRL_DEPTH;
1878 *return_value = device;
1883 static int acpi_scan_attach_handler(struct acpi_device *device)
1885 struct acpi_hardware_id *hwid;
1888 list_for_each_entry(hwid, &device->pnp.ids, list) {
1889 const struct acpi_device_id *devid;
1890 struct acpi_scan_handler *handler;
1892 handler = acpi_scan_match_handler(hwid->id, &devid);
1894 ret = handler->attach(device, devid);
1896 device->handler = handler;
1898 } else if (ret < 0) {
1906 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1907 void *not_used, void **ret_not_used)
1909 struct acpi_device *device;
1910 unsigned long long sta_not_used;
1914 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1915 * namespace walks prematurely.
1917 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1920 if (acpi_bus_get_device(handle, &device))
1921 return AE_CTRL_DEPTH;
1923 if (device->handler)
1926 ret = acpi_scan_attach_handler(device);
1928 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1930 ret = device_attach(&device->dev);
1931 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1935 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1936 * @handle: Root of the namespace scope to scan.
1938 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1941 * If no devices were found, -ENODEV is returned, but it does not mean that
1942 * there has been a real error. There just have been no suitable ACPI objects
1943 * in the table trunk from which the kernel could create a device and add an
1944 * appropriate driver.
1946 * Must be called under acpi_scan_lock.
1948 int acpi_bus_scan(acpi_handle handle)
1950 void *device = NULL;
1953 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1954 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1955 acpi_bus_check_add, NULL, NULL, &device);
1959 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1960 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1961 acpi_bus_device_attach, NULL, NULL, NULL);
1965 EXPORT_SYMBOL(acpi_bus_scan);
1967 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1968 void *not_used, void **ret_not_used)
1970 struct acpi_device *device = NULL;
1972 if (!acpi_bus_get_device(handle, &device)) {
1973 struct acpi_scan_handler *dev_handler = device->handler;
1976 if (dev_handler->detach)
1977 dev_handler->detach(device);
1979 device->handler = NULL;
1981 device_release_driver(&device->dev);
1987 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1988 void *not_used, void **ret_not_used)
1990 struct acpi_device *device = NULL;
1992 if (!acpi_bus_get_device(handle, &device))
1993 acpi_device_unregister(device);
1999 * acpi_bus_trim - Remove ACPI device node and all of its descendants
2000 * @start: Root of the ACPI device nodes subtree to remove.
2002 * Must be called under acpi_scan_lock.
2004 void acpi_bus_trim(struct acpi_device *start)
2007 * Execute acpi_bus_device_detach() as a post-order callback to detach
2008 * all ACPI drivers from the device nodes being removed.
2010 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2011 acpi_bus_device_detach, NULL, NULL);
2012 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2014 * Execute acpi_bus_remove() as a post-order callback to remove device
2015 * nodes in the given namespace scope.
2017 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2018 acpi_bus_remove, NULL, NULL);
2019 acpi_bus_remove(start->handle, 0, NULL, NULL);
2021 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2023 static int acpi_bus_scan_fixed(void)
2028 * Enumerate all fixed-feature devices.
2030 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2031 struct acpi_device *device = NULL;
2033 result = acpi_add_single_object(&device, NULL,
2034 ACPI_BUS_TYPE_POWER_BUTTON,
2039 result = device_attach(&device->dev);
2043 device_init_wakeup(&device->dev, true);
2046 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2047 struct acpi_device *device = NULL;
2049 result = acpi_add_single_object(&device, NULL,
2050 ACPI_BUS_TYPE_SLEEP_BUTTON,
2055 result = device_attach(&device->dev);
2058 return result < 0 ? result : 0;
2061 int __init acpi_scan_init(void)
2065 result = bus_register(&acpi_bus_type);
2067 /* We don't want to quit even if we failed to add suspend/resume */
2068 printk(KERN_ERR PREFIX "Could not register bus type\n");
2071 acpi_pci_root_init();
2072 acpi_pci_link_init();
2073 acpi_processor_init();
2074 acpi_platform_init();
2076 acpi_cmos_rtc_init();
2077 acpi_container_init();
2078 acpi_memory_hotplug_init();
2081 mutex_lock(&acpi_scan_lock);
2083 * Enumerate devices in the ACPI namespace.
2085 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2089 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2093 result = acpi_bus_scan_fixed();
2095 acpi_device_unregister(acpi_root);
2099 acpi_update_all_gpes();
2101 acpi_pci_root_hp_init();
2104 mutex_unlock(&acpi_scan_lock);