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(acpi_handle handle, u32 lvl, void *data,
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 if (device->handler && !device->handler->hotplug.enabled) {
140 *ret_p = &device->dev;
144 mutex_lock(&device->physical_node_lock);
146 list_for_each_entry(pn, &device->physical_node_list, node) {
150 /* Skip devices offlined by the first pass. */
154 pn->put_online = false;
156 ret = device_offline(pn->dev);
157 if (acpi_force_hot_remove)
161 pn->put_online = !ret;
171 mutex_unlock(&device->physical_node_lock);
176 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
179 struct acpi_device *device = NULL;
180 struct acpi_device_physical_node *pn;
182 if (acpi_bus_get_device(handle, &device))
185 mutex_lock(&device->physical_node_lock);
187 list_for_each_entry(pn, &device->physical_node_list, node)
188 if (pn->put_online) {
189 device_online(pn->dev);
190 pn->put_online = false;
193 mutex_unlock(&device->physical_node_lock);
198 static int acpi_scan_hot_remove(struct acpi_device *device)
200 acpi_handle handle = device->handle;
201 struct device *errdev;
203 unsigned long long sta;
205 /* If there is no handle, the device node has been unregistered. */
207 dev_dbg(&device->dev, "ACPI handle missing\n");
208 put_device(&device->dev);
213 * Carry out two passes here and ignore errors in the first pass,
214 * because if the devices in question are memory blocks and
215 * CONFIG_MEMCG is set, one of the blocks may hold data structures
216 * that the other blocks depend on, but it is not known in advance which
219 * If the first pass is successful, the second one isn't needed, though.
222 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
223 NULL, acpi_bus_offline, (void *)false,
225 if (status == AE_SUPPORT) {
226 dev_warn(errdev, "Offline disabled.\n");
227 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
228 acpi_bus_online, NULL, NULL, NULL);
229 put_device(&device->dev);
232 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
235 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
236 NULL, acpi_bus_offline, (void *)true,
238 if (!errdev || acpi_force_hot_remove)
239 acpi_bus_offline(handle, 0, (void *)true,
242 if (errdev && !acpi_force_hot_remove) {
243 dev_warn(errdev, "Offline failed.\n");
244 acpi_bus_online(handle, 0, NULL, NULL);
245 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
246 ACPI_UINT32_MAX, acpi_bus_online,
248 put_device(&device->dev);
253 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
254 "Hot-removing device %s...\n", dev_name(&device->dev)));
256 acpi_bus_trim(device);
258 /* Device node has been unregistered. */
259 put_device(&device->dev);
262 acpi_evaluate_lck(handle, 0);
266 status = acpi_evaluate_ej0(handle);
267 if (status == AE_NOT_FOUND)
269 else if (ACPI_FAILURE(status))
273 * Verify if eject was indeed successful. If not, log an error
274 * message. No need to call _OST since _EJ0 call was made OK.
276 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
277 if (ACPI_FAILURE(status)) {
278 acpi_handle_warn(handle,
279 "Status check after eject failed (0x%x)\n", status);
280 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
281 acpi_handle_warn(handle,
282 "Eject incomplete - status 0x%llx\n", sta);
288 void acpi_bus_device_eject(void *data, u32 ost_src)
290 struct acpi_device *device = data;
291 acpi_handle handle = device->handle;
292 struct acpi_scan_handler *handler;
293 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
296 lock_device_hotplug();
297 mutex_lock(&acpi_scan_lock);
299 handler = device->handler;
300 if (!handler || !handler->hotplug.enabled) {
301 put_device(&device->dev);
305 if (ost_src == ACPI_NOTIFY_EJECT_REQUEST)
306 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
307 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
309 if (handler->hotplug.mode == AHM_CONTAINER)
310 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
312 error = acpi_scan_hot_remove(device);
313 if (error == -EPERM) {
320 mutex_unlock(&acpi_scan_lock);
321 unlock_device_hotplug();
325 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
327 acpi_evaluate_hotplug_ost(handle, ost_src, ost_code, NULL);
331 static void acpi_scan_bus_device_check(void *data, u32 ost_source)
333 acpi_handle handle = data;
334 struct acpi_device *device = NULL;
335 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
338 lock_device_hotplug();
339 mutex_lock(&acpi_scan_lock);
341 if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
342 acpi_bus_get_device(handle, &device);
344 dev_warn(&device->dev, "Attempt to re-insert\n");
348 error = acpi_bus_scan(handle);
350 acpi_handle_warn(handle, "Namespace scan failure\n");
353 error = acpi_bus_get_device(handle, &device);
355 acpi_handle_warn(handle, "Missing device node object\n");
358 ost_code = ACPI_OST_SC_SUCCESS;
359 if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
360 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
363 acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
364 mutex_unlock(&acpi_scan_lock);
365 unlock_device_hotplug();
368 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
373 case ACPI_NOTIFY_BUS_CHECK:
374 acpi_handle_debug(handle,
375 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
376 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
378 case ACPI_NOTIFY_DEVICE_CHECK:
379 acpi_handle_debug(handle,
380 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
381 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
383 case ACPI_NOTIFY_EJECT_REQUEST:
384 acpi_handle_debug(handle,
385 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
386 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
389 /* non-hotplug event; possibly handled by other handler */
393 acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
396 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
398 struct acpi_scan_handler *handler = data;
399 struct acpi_device *adev;
402 if (!handler->hotplug.enabled)
403 return acpi_hotplug_unsupported(handle, type);
406 case ACPI_NOTIFY_BUS_CHECK:
407 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
409 case ACPI_NOTIFY_DEVICE_CHECK:
410 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
412 case ACPI_NOTIFY_EJECT_REQUEST:
413 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
414 status = acpi_bus_get_device(handle, &adev);
415 if (ACPI_FAILURE(status))
418 get_device(&adev->dev);
419 status = acpi_hotplug_execute(acpi_bus_device_eject, adev, type);
420 if (ACPI_SUCCESS(status))
423 put_device(&adev->dev);
426 /* non-hotplug event; possibly handled by other handler */
429 status = acpi_hotplug_execute(acpi_scan_bus_device_check, handle, type);
430 if (ACPI_SUCCESS(status))
434 acpi_evaluate_hotplug_ost(handle, type,
435 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
438 static ssize_t real_power_state_show(struct device *dev,
439 struct device_attribute *attr, char *buf)
441 struct acpi_device *adev = to_acpi_device(dev);
445 ret = acpi_device_get_power(adev, &state);
449 return sprintf(buf, "%s\n", acpi_power_state_string(state));
452 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
454 static ssize_t power_state_show(struct device *dev,
455 struct device_attribute *attr, char *buf)
457 struct acpi_device *adev = to_acpi_device(dev);
459 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
462 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
465 acpi_eject_store(struct device *d, struct device_attribute *attr,
466 const char *buf, size_t count)
468 struct acpi_device *acpi_device = to_acpi_device(d);
469 acpi_object_type not_used;
472 if (!count || buf[0] != '1')
475 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
476 && !acpi_device->driver)
479 status = acpi_get_type(acpi_device->handle, ¬_used);
480 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
483 acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
484 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
485 get_device(&acpi_device->dev);
486 status = acpi_hotplug_execute(acpi_bus_device_eject, acpi_device,
487 ACPI_OST_EC_OSPM_EJECT);
488 if (ACPI_SUCCESS(status))
491 put_device(&acpi_device->dev);
492 acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
493 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
494 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
497 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
500 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
501 struct acpi_device *acpi_dev = to_acpi_device(dev);
503 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
505 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
507 static ssize_t acpi_device_uid_show(struct device *dev,
508 struct device_attribute *attr, char *buf)
510 struct acpi_device *acpi_dev = to_acpi_device(dev);
512 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
514 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
516 static ssize_t acpi_device_adr_show(struct device *dev,
517 struct device_attribute *attr, char *buf)
519 struct acpi_device *acpi_dev = to_acpi_device(dev);
521 return sprintf(buf, "0x%08x\n",
522 (unsigned int)(acpi_dev->pnp.bus_address));
524 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
527 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
528 struct acpi_device *acpi_dev = to_acpi_device(dev);
529 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
532 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
536 result = sprintf(buf, "%s\n", (char*)path.pointer);
541 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
543 /* sysfs file that shows description text from the ACPI _STR method */
544 static ssize_t description_show(struct device *dev,
545 struct device_attribute *attr,
547 struct acpi_device *acpi_dev = to_acpi_device(dev);
550 if (acpi_dev->pnp.str_obj == NULL)
554 * The _STR object contains a Unicode identifier for a device.
555 * We need to convert to utf-8 so it can be displayed.
557 result = utf16s_to_utf8s(
558 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
559 acpi_dev->pnp.str_obj->buffer.length,
560 UTF16_LITTLE_ENDIAN, buf,
563 buf[result++] = '\n';
567 static DEVICE_ATTR(description, 0444, description_show, NULL);
570 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
572 struct acpi_device *acpi_dev = to_acpi_device(dev);
574 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
576 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
578 static int acpi_device_setup_files(struct acpi_device *dev)
580 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
582 unsigned long long sun;
586 * Devices gotten from FADT don't have a "path" attribute
589 result = device_create_file(&dev->dev, &dev_attr_path);
594 if (!list_empty(&dev->pnp.ids)) {
595 result = device_create_file(&dev->dev, &dev_attr_hid);
599 result = device_create_file(&dev->dev, &dev_attr_modalias);
605 * If device has _STR, 'description' file is created
607 if (acpi_has_method(dev->handle, "_STR")) {
608 status = acpi_evaluate_object(dev->handle, "_STR",
610 if (ACPI_FAILURE(status))
611 buffer.pointer = NULL;
612 dev->pnp.str_obj = buffer.pointer;
613 result = device_create_file(&dev->dev, &dev_attr_description);
618 if (dev->pnp.type.bus_address)
619 result = device_create_file(&dev->dev, &dev_attr_adr);
620 if (dev->pnp.unique_id)
621 result = device_create_file(&dev->dev, &dev_attr_uid);
623 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
624 if (ACPI_SUCCESS(status)) {
625 dev->pnp.sun = (unsigned long)sun;
626 result = device_create_file(&dev->dev, &dev_attr_sun);
630 dev->pnp.sun = (unsigned long)-1;
634 * If device has _EJ0, 'eject' file is created that is used to trigger
635 * hot-removal function from userland.
637 if (acpi_has_method(dev->handle, "_EJ0")) {
638 result = device_create_file(&dev->dev, &dev_attr_eject);
643 if (dev->flags.power_manageable) {
644 result = device_create_file(&dev->dev, &dev_attr_power_state);
648 if (dev->power.flags.power_resources)
649 result = device_create_file(&dev->dev,
650 &dev_attr_real_power_state);
657 static void acpi_device_remove_files(struct acpi_device *dev)
659 if (dev->flags.power_manageable) {
660 device_remove_file(&dev->dev, &dev_attr_power_state);
661 if (dev->power.flags.power_resources)
662 device_remove_file(&dev->dev,
663 &dev_attr_real_power_state);
667 * If device has _STR, remove 'description' file
669 if (acpi_has_method(dev->handle, "_STR")) {
670 kfree(dev->pnp.str_obj);
671 device_remove_file(&dev->dev, &dev_attr_description);
674 * If device has _EJ0, remove 'eject' file.
676 if (acpi_has_method(dev->handle, "_EJ0"))
677 device_remove_file(&dev->dev, &dev_attr_eject);
679 if (acpi_has_method(dev->handle, "_SUN"))
680 device_remove_file(&dev->dev, &dev_attr_sun);
682 if (dev->pnp.unique_id)
683 device_remove_file(&dev->dev, &dev_attr_uid);
684 if (dev->pnp.type.bus_address)
685 device_remove_file(&dev->dev, &dev_attr_adr);
686 device_remove_file(&dev->dev, &dev_attr_modalias);
687 device_remove_file(&dev->dev, &dev_attr_hid);
689 device_remove_file(&dev->dev, &dev_attr_path);
691 /* --------------------------------------------------------------------------
693 -------------------------------------------------------------------------- */
695 static const struct acpi_device_id *__acpi_match_device(
696 struct acpi_device *device, const struct acpi_device_id *ids)
698 const struct acpi_device_id *id;
699 struct acpi_hardware_id *hwid;
702 * If the device is not present, it is unnecessary to load device
705 if (!device->status.present)
708 for (id = ids; id->id[0]; id++)
709 list_for_each_entry(hwid, &device->pnp.ids, list)
710 if (!strcmp((char *) id->id, hwid->id))
717 * acpi_match_device - Match a struct device against a given list of ACPI IDs
718 * @ids: Array of struct acpi_device_id object to match against.
719 * @dev: The device structure to match.
721 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
722 * object for that handle and use that object to match against a given list of
725 * Return a pointer to the first matching ID on success or %NULL on failure.
727 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
728 const struct device *dev)
730 struct acpi_device *adev;
731 acpi_handle handle = ACPI_HANDLE(dev);
733 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
736 return __acpi_match_device(adev, ids);
738 EXPORT_SYMBOL_GPL(acpi_match_device);
740 int acpi_match_device_ids(struct acpi_device *device,
741 const struct acpi_device_id *ids)
743 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
745 EXPORT_SYMBOL(acpi_match_device_ids);
747 static void acpi_free_power_resources_lists(struct acpi_device *device)
751 if (device->wakeup.flags.valid)
752 acpi_power_resources_list_free(&device->wakeup.resources);
754 if (!device->flags.power_manageable)
757 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
758 struct acpi_device_power_state *ps = &device->power.states[i];
759 acpi_power_resources_list_free(&ps->resources);
763 static void acpi_device_release(struct device *dev)
765 struct acpi_device *acpi_dev = to_acpi_device(dev);
767 acpi_free_pnp_ids(&acpi_dev->pnp);
768 acpi_free_power_resources_lists(acpi_dev);
772 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
774 struct acpi_device *acpi_dev = to_acpi_device(dev);
775 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
777 return acpi_dev->flags.match_driver
778 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
781 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
783 struct acpi_device *acpi_dev = to_acpi_device(dev);
786 if (list_empty(&acpi_dev->pnp.ids))
789 if (add_uevent_var(env, "MODALIAS="))
791 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
792 sizeof(env->buf) - env->buflen);
793 if (len >= (sizeof(env->buf) - env->buflen))
799 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
801 struct acpi_device *device = data;
803 device->driver->ops.notify(device, event);
806 static acpi_status acpi_device_notify_fixed(void *data)
808 struct acpi_device *device = data;
810 /* Fixed hardware devices have no handles */
811 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
815 static int acpi_device_install_notify_handler(struct acpi_device *device)
819 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
821 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
822 acpi_device_notify_fixed,
824 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
826 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
827 acpi_device_notify_fixed,
830 status = acpi_install_notify_handler(device->handle,
835 if (ACPI_FAILURE(status))
840 static void acpi_device_remove_notify_handler(struct acpi_device *device)
842 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
843 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
844 acpi_device_notify_fixed);
845 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
846 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
847 acpi_device_notify_fixed);
849 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
853 static int acpi_device_probe(struct device *dev)
855 struct acpi_device *acpi_dev = to_acpi_device(dev);
856 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
859 if (acpi_dev->handler)
862 if (!acpi_drv->ops.add)
865 ret = acpi_drv->ops.add(acpi_dev);
869 acpi_dev->driver = acpi_drv;
870 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
871 "Driver [%s] successfully bound to device [%s]\n",
872 acpi_drv->name, acpi_dev->pnp.bus_id));
874 if (acpi_drv->ops.notify) {
875 ret = acpi_device_install_notify_handler(acpi_dev);
877 if (acpi_drv->ops.remove)
878 acpi_drv->ops.remove(acpi_dev);
880 acpi_dev->driver = NULL;
881 acpi_dev->driver_data = NULL;
886 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
887 acpi_drv->name, acpi_dev->pnp.bus_id));
892 static int acpi_device_remove(struct device * dev)
894 struct acpi_device *acpi_dev = to_acpi_device(dev);
895 struct acpi_driver *acpi_drv = acpi_dev->driver;
898 if (acpi_drv->ops.notify)
899 acpi_device_remove_notify_handler(acpi_dev);
900 if (acpi_drv->ops.remove)
901 acpi_drv->ops.remove(acpi_dev);
903 acpi_dev->driver = NULL;
904 acpi_dev->driver_data = NULL;
910 struct bus_type acpi_bus_type = {
912 .match = acpi_bus_match,
913 .probe = acpi_device_probe,
914 .remove = acpi_device_remove,
915 .uevent = acpi_device_uevent,
918 static void acpi_bus_data_handler(acpi_handle handle, void *context)
920 /* Intentionally empty. */
923 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
930 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
931 if (ACPI_FAILURE(status) || !*device) {
932 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
938 EXPORT_SYMBOL(acpi_bus_get_device);
940 int acpi_device_add(struct acpi_device *device,
941 void (*release)(struct device *))
944 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
947 if (device->handle) {
950 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
952 if (ACPI_FAILURE(status)) {
953 acpi_handle_err(device->handle,
954 "Unable to attach device data\n");
962 * Link this device to its parent and siblings.
964 INIT_LIST_HEAD(&device->children);
965 INIT_LIST_HEAD(&device->node);
966 INIT_LIST_HEAD(&device->wakeup_list);
967 INIT_LIST_HEAD(&device->physical_node_list);
968 mutex_init(&device->physical_node_lock);
970 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
972 pr_err(PREFIX "Memory allocation error\n");
977 mutex_lock(&acpi_device_lock);
979 * Find suitable bus_id and instance number in acpi_bus_id_list
980 * If failed, create one and link it into acpi_bus_id_list
982 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
983 if (!strcmp(acpi_device_bus_id->bus_id,
984 acpi_device_hid(device))) {
985 acpi_device_bus_id->instance_no++;
992 acpi_device_bus_id = new_bus_id;
993 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
994 acpi_device_bus_id->instance_no = 0;
995 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
997 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1000 list_add_tail(&device->node, &device->parent->children);
1002 if (device->wakeup.flags.valid)
1003 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1004 mutex_unlock(&acpi_device_lock);
1007 device->dev.parent = &device->parent->dev;
1008 device->dev.bus = &acpi_bus_type;
1009 device->dev.release = release;
1010 result = device_add(&device->dev);
1012 dev_err(&device->dev, "Error registering device\n");
1016 result = acpi_device_setup_files(device);
1018 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1019 dev_name(&device->dev));
1024 mutex_lock(&acpi_device_lock);
1026 list_del(&device->node);
1027 list_del(&device->wakeup_list);
1028 mutex_unlock(&acpi_device_lock);
1031 acpi_detach_data(device->handle, acpi_bus_data_handler);
1035 static void acpi_device_unregister(struct acpi_device *device)
1037 mutex_lock(&acpi_device_lock);
1039 list_del(&device->node);
1041 list_del(&device->wakeup_list);
1042 mutex_unlock(&acpi_device_lock);
1044 acpi_detach_data(device->handle, acpi_bus_data_handler);
1046 acpi_power_add_remove_device(device, false);
1047 acpi_device_remove_files(device);
1049 device->remove(device);
1051 device_del(&device->dev);
1053 * Transition the device to D3cold to drop the reference counts of all
1054 * power resources the device depends on and turn off the ones that have
1055 * no more references.
1057 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1058 device->handle = NULL;
1059 put_device(&device->dev);
1062 /* --------------------------------------------------------------------------
1064 -------------------------------------------------------------------------- */
1066 * acpi_bus_register_driver - register a driver with the ACPI bus
1067 * @driver: driver being registered
1069 * Registers a driver with the ACPI bus. Searches the namespace for all
1070 * devices that match the driver's criteria and binds. Returns zero for
1071 * success or a negative error status for failure.
1073 int acpi_bus_register_driver(struct acpi_driver *driver)
1079 driver->drv.name = driver->name;
1080 driver->drv.bus = &acpi_bus_type;
1081 driver->drv.owner = driver->owner;
1083 ret = driver_register(&driver->drv);
1087 EXPORT_SYMBOL(acpi_bus_register_driver);
1090 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1091 * @driver: driver to unregister
1093 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1094 * devices that match the driver's criteria and unbinds.
1096 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1098 driver_unregister(&driver->drv);
1101 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1103 /* --------------------------------------------------------------------------
1105 -------------------------------------------------------------------------- */
1106 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1108 struct acpi_device *device = NULL;
1112 * Fixed hardware devices do not appear in the namespace and do not
1113 * have handles, but we fabricate acpi_devices for them, so we have
1114 * to deal with them specially.
1120 status = acpi_get_parent(handle, &handle);
1121 if (ACPI_FAILURE(status))
1122 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1123 } while (acpi_bus_get_device(handle, &device));
1128 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1132 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1133 union acpi_object *obj;
1135 status = acpi_get_handle(handle, "_EJD", &tmp);
1136 if (ACPI_FAILURE(status))
1139 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1140 if (ACPI_SUCCESS(status)) {
1141 obj = buffer.pointer;
1142 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1144 kfree(buffer.pointer);
1148 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1150 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1151 struct acpi_device_wakeup *wakeup)
1153 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1154 union acpi_object *package = NULL;
1155 union acpi_object *element = NULL;
1162 INIT_LIST_HEAD(&wakeup->resources);
1165 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1166 if (ACPI_FAILURE(status)) {
1167 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1171 package = (union acpi_object *)buffer.pointer;
1173 if (!package || package->package.count < 2)
1176 element = &(package->package.elements[0]);
1180 if (element->type == ACPI_TYPE_PACKAGE) {
1181 if ((element->package.count < 2) ||
1182 (element->package.elements[0].type !=
1183 ACPI_TYPE_LOCAL_REFERENCE)
1184 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1187 wakeup->gpe_device =
1188 element->package.elements[0].reference.handle;
1189 wakeup->gpe_number =
1190 (u32) element->package.elements[1].integer.value;
1191 } else if (element->type == ACPI_TYPE_INTEGER) {
1192 wakeup->gpe_device = NULL;
1193 wakeup->gpe_number = element->integer.value;
1198 element = &(package->package.elements[1]);
1199 if (element->type != ACPI_TYPE_INTEGER)
1202 wakeup->sleep_state = element->integer.value;
1204 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1208 if (!list_empty(&wakeup->resources)) {
1211 err = acpi_power_wakeup_list_init(&wakeup->resources,
1214 acpi_handle_warn(handle, "Retrieving current states "
1215 "of wakeup power resources failed\n");
1216 acpi_power_resources_list_free(&wakeup->resources);
1219 if (sleep_state < wakeup->sleep_state) {
1220 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1221 "(S%d) by S%d from power resources\n",
1222 (int)wakeup->sleep_state, sleep_state);
1223 wakeup->sleep_state = sleep_state;
1226 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1229 kfree(buffer.pointer);
1233 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1235 struct acpi_device_id button_device_ids[] = {
1242 acpi_event_status event_status;
1244 device->wakeup.flags.notifier_present = 0;
1246 /* Power button, Lid switch always enable wakeup */
1247 if (!acpi_match_device_ids(device, button_device_ids)) {
1248 device->wakeup.flags.run_wake = 1;
1249 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1250 /* Do not use Lid/sleep button for S5 wakeup */
1251 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1252 device->wakeup.sleep_state = ACPI_STATE_S4;
1254 device_set_wakeup_capable(&device->dev, true);
1258 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1259 device->wakeup.gpe_number,
1261 if (status == AE_OK)
1262 device->wakeup.flags.run_wake =
1263 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1266 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1270 /* Presence of _PRW indicates wake capable */
1271 if (!acpi_has_method(device->handle, "_PRW"))
1274 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1277 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1281 device->wakeup.flags.valid = 1;
1282 device->wakeup.prepare_count = 0;
1283 acpi_bus_set_run_wake_flags(device);
1284 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1285 * system for the ACPI device with the _PRW object.
1286 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1287 * So it is necessary to call _DSW object first. Only when it is not
1288 * present will the _PSW object used.
1290 err = acpi_device_sleep_wake(device, 0, 0, 0);
1292 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1293 "error in _DSW or _PSW evaluation\n"));
1296 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1298 struct acpi_device_power_state *ps = &device->power.states[state];
1299 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1300 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1303 INIT_LIST_HEAD(&ps->resources);
1305 /* Evaluate "_PRx" to get referenced power resources */
1306 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1307 if (ACPI_SUCCESS(status)) {
1308 union acpi_object *package = buffer.pointer;
1310 if (buffer.length && package
1311 && package->type == ACPI_TYPE_PACKAGE
1312 && package->package.count) {
1313 int err = acpi_extract_power_resources(package, 0,
1316 device->power.flags.power_resources = 1;
1318 ACPI_FREE(buffer.pointer);
1321 /* Evaluate "_PSx" to see if we can do explicit sets */
1323 if (acpi_has_method(device->handle, pathname))
1324 ps->flags.explicit_set = 1;
1327 * State is valid if there are means to put the device into it.
1328 * D3hot is only valid if _PR3 present.
1330 if (!list_empty(&ps->resources)
1331 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1332 ps->flags.valid = 1;
1333 ps->flags.os_accessible = 1;
1336 ps->power = -1; /* Unknown - driver assigned */
1337 ps->latency = -1; /* Unknown - driver assigned */
1340 static void acpi_bus_get_power_flags(struct acpi_device *device)
1344 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1345 if (!acpi_has_method(device->handle, "_PS0") &&
1346 !acpi_has_method(device->handle, "_PR0"))
1349 device->flags.power_manageable = 1;
1352 * Power Management Flags
1354 if (acpi_has_method(device->handle, "_PSC"))
1355 device->power.flags.explicit_get = 1;
1356 if (acpi_has_method(device->handle, "_IRC"))
1357 device->power.flags.inrush_current = 1;
1360 * Enumerate supported power management states
1362 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1363 acpi_bus_init_power_state(device, i);
1365 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1367 /* Set defaults for D0 and D3 states (always valid) */
1368 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1369 device->power.states[ACPI_STATE_D0].power = 100;
1370 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1371 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1373 /* Set D3cold's explicit_set flag if _PS3 exists. */
1374 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1375 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1377 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1378 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1379 device->power.flags.power_resources)
1380 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1382 if (acpi_bus_init_power(device)) {
1383 acpi_free_power_resources_lists(device);
1384 device->flags.power_manageable = 0;
1388 static void acpi_bus_get_flags(struct acpi_device *device)
1390 /* Presence of _STA indicates 'dynamic_status' */
1391 if (acpi_has_method(device->handle, "_STA"))
1392 device->flags.dynamic_status = 1;
1394 /* Presence of _RMV indicates 'removable' */
1395 if (acpi_has_method(device->handle, "_RMV"))
1396 device->flags.removable = 1;
1398 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1399 if (acpi_has_method(device->handle, "_EJD") ||
1400 acpi_has_method(device->handle, "_EJ0"))
1401 device->flags.ejectable = 1;
1404 static void acpi_device_get_busid(struct acpi_device *device)
1406 char bus_id[5] = { '?', 0 };
1407 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1413 * The device's Bus ID is simply the object name.
1414 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1416 if (ACPI_IS_ROOT_DEVICE(device)) {
1417 strcpy(device->pnp.bus_id, "ACPI");
1421 switch (device->device_type) {
1422 case ACPI_BUS_TYPE_POWER_BUTTON:
1423 strcpy(device->pnp.bus_id, "PWRF");
1425 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1426 strcpy(device->pnp.bus_id, "SLPF");
1429 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1430 /* Clean up trailing underscores (if any) */
1431 for (i = 3; i > 1; i--) {
1432 if (bus_id[i] == '_')
1437 strcpy(device->pnp.bus_id, bus_id);
1443 * acpi_ata_match - see if an acpi object is an ATA device
1445 * If an acpi object has one of the ACPI ATA methods defined,
1446 * then we can safely call it an ATA device.
1448 bool acpi_ata_match(acpi_handle handle)
1450 return acpi_has_method(handle, "_GTF") ||
1451 acpi_has_method(handle, "_GTM") ||
1452 acpi_has_method(handle, "_STM") ||
1453 acpi_has_method(handle, "_SDD");
1457 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1459 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1460 * then we can safely call it an ejectable drive bay
1462 bool acpi_bay_match(acpi_handle handle)
1464 acpi_handle phandle;
1466 if (!acpi_has_method(handle, "_EJ0"))
1468 if (acpi_ata_match(handle))
1470 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1473 return acpi_ata_match(phandle);
1477 * acpi_dock_match - see if an acpi object has a _DCK method
1479 bool acpi_dock_match(acpi_handle handle)
1481 return acpi_has_method(handle, "_DCK");
1484 const char *acpi_device_hid(struct acpi_device *device)
1486 struct acpi_hardware_id *hid;
1488 if (list_empty(&device->pnp.ids))
1491 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1494 EXPORT_SYMBOL(acpi_device_hid);
1496 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1498 struct acpi_hardware_id *id;
1500 id = kmalloc(sizeof(*id), GFP_KERNEL);
1504 id->id = kstrdup(dev_id, GFP_KERNEL);
1510 list_add_tail(&id->list, &pnp->ids);
1511 pnp->type.hardware_id = 1;
1515 * Old IBM workstations have a DSDT bug wherein the SMBus object
1516 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1517 * prefix. Work around this.
1519 static bool acpi_ibm_smbus_match(acpi_handle handle)
1521 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1522 struct acpi_buffer path = { sizeof(node_name), node_name };
1524 if (!dmi_name_in_vendors("IBM"))
1527 /* Look for SMBS object */
1528 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1529 strcmp("SMBS", path.pointer))
1532 /* Does it have the necessary (but misnamed) methods? */
1533 if (acpi_has_method(handle, "SBI") &&
1534 acpi_has_method(handle, "SBR") &&
1535 acpi_has_method(handle, "SBW"))
1541 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1545 struct acpi_device_info *info;
1546 struct acpi_pnp_device_id_list *cid_list;
1549 switch (device_type) {
1550 case ACPI_BUS_TYPE_DEVICE:
1551 if (handle == ACPI_ROOT_OBJECT) {
1552 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1556 status = acpi_get_object_info(handle, &info);
1557 if (ACPI_FAILURE(status)) {
1558 pr_err(PREFIX "%s: Error reading device info\n",
1563 if (info->valid & ACPI_VALID_HID)
1564 acpi_add_id(pnp, info->hardware_id.string);
1565 if (info->valid & ACPI_VALID_CID) {
1566 cid_list = &info->compatible_id_list;
1567 for (i = 0; i < cid_list->count; i++)
1568 acpi_add_id(pnp, cid_list->ids[i].string);
1570 if (info->valid & ACPI_VALID_ADR) {
1571 pnp->bus_address = info->address;
1572 pnp->type.bus_address = 1;
1574 if (info->valid & ACPI_VALID_UID)
1575 pnp->unique_id = kstrdup(info->unique_id.string,
1581 * Some devices don't reliably have _HIDs & _CIDs, so add
1582 * synthetic HIDs to make sure drivers can find them.
1584 if (acpi_is_video_device(handle))
1585 acpi_add_id(pnp, ACPI_VIDEO_HID);
1586 else if (acpi_bay_match(handle))
1587 acpi_add_id(pnp, ACPI_BAY_HID);
1588 else if (acpi_dock_match(handle))
1589 acpi_add_id(pnp, ACPI_DOCK_HID);
1590 else if (acpi_ibm_smbus_match(handle))
1591 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1592 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1593 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1594 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1595 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1599 case ACPI_BUS_TYPE_POWER:
1600 acpi_add_id(pnp, ACPI_POWER_HID);
1602 case ACPI_BUS_TYPE_PROCESSOR:
1603 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1605 case ACPI_BUS_TYPE_THERMAL:
1606 acpi_add_id(pnp, ACPI_THERMAL_HID);
1608 case ACPI_BUS_TYPE_POWER_BUTTON:
1609 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1611 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1612 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1617 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1619 struct acpi_hardware_id *id, *tmp;
1621 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1625 kfree(pnp->unique_id);
1628 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1629 int type, unsigned long long sta)
1631 INIT_LIST_HEAD(&device->pnp.ids);
1632 device->device_type = type;
1633 device->handle = handle;
1634 device->parent = acpi_bus_get_parent(handle);
1635 STRUCT_TO_INT(device->status) = sta;
1636 acpi_device_get_busid(device);
1637 acpi_set_pnp_ids(handle, &device->pnp, type);
1638 acpi_bus_get_flags(device);
1639 device->flags.match_driver = false;
1640 device_initialize(&device->dev);
1641 dev_set_uevent_suppress(&device->dev, true);
1644 void acpi_device_add_finalize(struct acpi_device *device)
1646 dev_set_uevent_suppress(&device->dev, false);
1647 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1650 static int acpi_add_single_object(struct acpi_device **child,
1651 acpi_handle handle, int type,
1652 unsigned long long sta)
1655 struct acpi_device *device;
1656 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1658 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1660 printk(KERN_ERR PREFIX "Memory allocation error\n");
1664 acpi_init_device_object(device, handle, type, sta);
1665 acpi_bus_get_power_flags(device);
1666 acpi_bus_get_wakeup_device_flags(device);
1668 result = acpi_device_add(device, acpi_device_release);
1670 acpi_device_release(&device->dev);
1674 acpi_power_add_remove_device(device, true);
1675 acpi_device_add_finalize(device);
1676 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1677 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1678 dev_name(&device->dev), (char *) buffer.pointer,
1679 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1680 kfree(buffer.pointer);
1685 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1686 unsigned long long *sta)
1689 acpi_object_type acpi_type;
1691 status = acpi_get_type(handle, &acpi_type);
1692 if (ACPI_FAILURE(status))
1695 switch (acpi_type) {
1696 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1697 case ACPI_TYPE_DEVICE:
1698 *type = ACPI_BUS_TYPE_DEVICE;
1699 status = acpi_bus_get_status_handle(handle, sta);
1700 if (ACPI_FAILURE(status))
1703 case ACPI_TYPE_PROCESSOR:
1704 *type = ACPI_BUS_TYPE_PROCESSOR;
1705 status = acpi_bus_get_status_handle(handle, sta);
1706 if (ACPI_FAILURE(status))
1709 case ACPI_TYPE_THERMAL:
1710 *type = ACPI_BUS_TYPE_THERMAL;
1711 *sta = ACPI_STA_DEFAULT;
1713 case ACPI_TYPE_POWER:
1714 *type = ACPI_BUS_TYPE_POWER;
1715 *sta = ACPI_STA_DEFAULT;
1724 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1726 const struct acpi_device_id **matchid)
1728 const struct acpi_device_id *devid;
1730 for (devid = handler->ids; devid->id[0]; devid++)
1731 if (!strcmp((char *)devid->id, idstr)) {
1741 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1742 const struct acpi_device_id **matchid)
1744 struct acpi_scan_handler *handler;
1746 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1747 if (acpi_scan_handler_matching(handler, idstr, matchid))
1753 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1755 if (!!hotplug->enabled == !!val)
1758 mutex_lock(&acpi_scan_lock);
1760 hotplug->enabled = val;
1762 mutex_unlock(&acpi_scan_lock);
1765 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1767 struct acpi_device_pnp pnp = {};
1768 struct acpi_hardware_id *hwid;
1769 struct acpi_scan_handler *handler;
1771 INIT_LIST_HEAD(&pnp.ids);
1772 acpi_set_pnp_ids(handle, &pnp, type);
1774 if (!pnp.type.hardware_id)
1778 * This relies on the fact that acpi_install_notify_handler() will not
1779 * install the same notify handler routine twice for the same handle.
1781 list_for_each_entry(hwid, &pnp.ids, list) {
1782 handler = acpi_scan_match_handler(hwid->id, NULL);
1784 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1785 acpi_hotplug_notify_cb, handler);
1791 acpi_free_pnp_ids(&pnp);
1794 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1795 void *not_used, void **return_value)
1797 struct acpi_device *device = NULL;
1799 unsigned long long sta;
1802 acpi_bus_get_device(handle, &device);
1806 result = acpi_bus_type_and_status(handle, &type, &sta);
1810 if (type == ACPI_BUS_TYPE_POWER) {
1811 acpi_add_power_resource(handle);
1815 acpi_scan_init_hotplug(handle, type);
1817 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1818 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1819 struct acpi_device_wakeup wakeup;
1821 if (acpi_has_method(handle, "_PRW")) {
1822 acpi_bus_extract_wakeup_device_power_package(handle,
1824 acpi_power_resources_list_free(&wakeup.resources);
1826 return AE_CTRL_DEPTH;
1829 acpi_add_single_object(&device, handle, type, sta);
1831 return AE_CTRL_DEPTH;
1835 *return_value = device;
1840 static int acpi_scan_attach_handler(struct acpi_device *device)
1842 struct acpi_hardware_id *hwid;
1845 list_for_each_entry(hwid, &device->pnp.ids, list) {
1846 const struct acpi_device_id *devid;
1847 struct acpi_scan_handler *handler;
1849 handler = acpi_scan_match_handler(hwid->id, &devid);
1851 ret = handler->attach(device, devid);
1853 device->handler = handler;
1855 } else if (ret < 0) {
1863 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1864 void *not_used, void **ret_not_used)
1866 struct acpi_device *device;
1867 unsigned long long sta_not_used;
1871 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1872 * namespace walks prematurely.
1874 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1877 if (acpi_bus_get_device(handle, &device))
1878 return AE_CTRL_DEPTH;
1880 if (device->handler)
1883 ret = acpi_scan_attach_handler(device);
1885 return AE_CTRL_DEPTH;
1887 device->flags.match_driver = true;
1891 ret = device_attach(&device->dev);
1892 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1896 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1897 * @handle: Root of the namespace scope to scan.
1899 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1902 * If no devices were found, -ENODEV is returned, but it does not mean that
1903 * there has been a real error. There just have been no suitable ACPI objects
1904 * in the table trunk from which the kernel could create a device and add an
1905 * appropriate driver.
1907 * Must be called under acpi_scan_lock.
1909 int acpi_bus_scan(acpi_handle handle)
1911 void *device = NULL;
1914 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1915 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1916 acpi_bus_check_add, NULL, NULL, &device);
1920 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1921 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1922 acpi_bus_device_attach, NULL, NULL, NULL);
1926 EXPORT_SYMBOL(acpi_bus_scan);
1928 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1929 void *not_used, void **ret_not_used)
1931 struct acpi_device *device = NULL;
1933 if (!acpi_bus_get_device(handle, &device)) {
1934 struct acpi_scan_handler *dev_handler = device->handler;
1937 if (dev_handler->detach)
1938 dev_handler->detach(device);
1940 device->handler = NULL;
1942 device_release_driver(&device->dev);
1948 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1949 void *not_used, void **ret_not_used)
1951 struct acpi_device *device = NULL;
1953 if (!acpi_bus_get_device(handle, &device))
1954 acpi_device_unregister(device);
1960 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1961 * @start: Root of the ACPI device nodes subtree to remove.
1963 * Must be called under acpi_scan_lock.
1965 void acpi_bus_trim(struct acpi_device *start)
1968 * Execute acpi_bus_device_detach() as a post-order callback to detach
1969 * all ACPI drivers from the device nodes being removed.
1971 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1972 acpi_bus_device_detach, NULL, NULL);
1973 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1975 * Execute acpi_bus_remove() as a post-order callback to remove device
1976 * nodes in the given namespace scope.
1978 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1979 acpi_bus_remove, NULL, NULL);
1980 acpi_bus_remove(start->handle, 0, NULL, NULL);
1982 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1984 static int acpi_bus_scan_fixed(void)
1989 * Enumerate all fixed-feature devices.
1991 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1992 struct acpi_device *device = NULL;
1994 result = acpi_add_single_object(&device, NULL,
1995 ACPI_BUS_TYPE_POWER_BUTTON,
2000 result = device_attach(&device->dev);
2004 device_init_wakeup(&device->dev, true);
2007 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2008 struct acpi_device *device = NULL;
2010 result = acpi_add_single_object(&device, NULL,
2011 ACPI_BUS_TYPE_SLEEP_BUTTON,
2016 result = device_attach(&device->dev);
2019 return result < 0 ? result : 0;
2022 int __init acpi_scan_init(void)
2026 result = bus_register(&acpi_bus_type);
2028 /* We don't want to quit even if we failed to add suspend/resume */
2029 printk(KERN_ERR PREFIX "Could not register bus type\n");
2032 acpi_pci_root_init();
2033 acpi_pci_link_init();
2034 acpi_processor_init();
2035 acpi_platform_init();
2037 acpi_cmos_rtc_init();
2038 acpi_container_init();
2039 acpi_memory_hotplug_init();
2042 mutex_lock(&acpi_scan_lock);
2044 * Enumerate devices in the ACPI namespace.
2046 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2050 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2054 result = acpi_bus_scan_fixed();
2056 acpi_device_unregister(acpi_root);
2060 acpi_update_all_gpes();
2062 acpi_pci_root_hp_init();
2065 mutex_unlock(&acpi_scan_lock);