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 <asm/pgtable.h>
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 extern struct acpi_device *acpi_root;
23 #define ACPI_BUS_CLASS "system_bus"
24 #define ACPI_BUS_HID "LNXSYBUS"
25 #define ACPI_BUS_DEVICE_NAME "System Bus"
27 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
29 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
32 * If set, devices will be hot-removed even if they cannot be put offline
33 * gracefully (from the kernel's standpoint).
35 bool acpi_force_hot_remove;
37 static const char *dummy_hid = "device";
39 static LIST_HEAD(acpi_bus_id_list);
40 static DEFINE_MUTEX(acpi_scan_lock);
41 static LIST_HEAD(acpi_scan_handlers_list);
42 DEFINE_MUTEX(acpi_device_lock);
43 LIST_HEAD(acpi_wakeup_device_list);
44 static DEFINE_MUTEX(acpi_hp_context_lock);
46 struct acpi_device_bus_id{
48 unsigned int instance_no;
49 struct list_head node;
52 void acpi_scan_lock_acquire(void)
54 mutex_lock(&acpi_scan_lock);
56 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
58 void acpi_scan_lock_release(void)
60 mutex_unlock(&acpi_scan_lock);
62 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
64 void acpi_lock_hp_context(void)
66 mutex_lock(&acpi_hp_context_lock);
69 void acpi_unlock_hp_context(void)
71 mutex_unlock(&acpi_hp_context_lock);
74 void acpi_initialize_hp_context(struct acpi_device *adev,
75 struct acpi_hotplug_context *hp,
76 int (*notify)(struct acpi_device *, u32),
77 void (*uevent)(struct acpi_device *, u32))
79 acpi_lock_hp_context();
80 acpi_set_hp_context(adev, hp, notify, uevent, NULL);
81 acpi_unlock_hp_context();
83 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
85 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
87 if (!handler || !handler->attach)
90 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
94 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
95 const char *hotplug_profile_name)
99 error = acpi_scan_add_handler(handler);
103 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
108 * Creates hid/cid(s) string needed for modalias and uevent
109 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
110 * char *modalias: "acpi:IBM0001:ACPI0001"
111 * Return: 0: no _HID and no _CID
112 * -EINVAL: output error
113 * -ENOMEM: output is truncated
115 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
120 struct acpi_hardware_id *id;
122 if (list_empty(&acpi_dev->pnp.ids))
125 len = snprintf(modalias, size, "acpi:");
128 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
129 count = snprintf(&modalias[len], size, "%s:", id->id);
138 modalias[len] = '\0';
143 * Creates uevent modalias field for ACPI enumerated devices.
144 * Because the other buses does not support ACPI HIDs & CIDs.
145 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
146 * "acpi:IBM0001:ACPI0001"
148 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
150 struct acpi_device *acpi_dev;
153 acpi_dev = ACPI_COMPANION(dev);
157 /* Fall back to bus specific way of modalias exporting */
158 if (list_empty(&acpi_dev->pnp.ids))
161 if (add_uevent_var(env, "MODALIAS="))
163 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
164 sizeof(env->buf) - env->buflen);
170 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
173 * Creates modalias sysfs attribute for ACPI enumerated devices.
174 * Because the other buses does not support ACPI HIDs & CIDs.
175 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
176 * "acpi:IBM0001:ACPI0001"
178 int acpi_device_modalias(struct device *dev, char *buf, int size)
180 struct acpi_device *acpi_dev;
183 acpi_dev = ACPI_COMPANION(dev);
187 /* Fall back to bus specific way of modalias exporting */
188 if (list_empty(&acpi_dev->pnp.ids))
191 len = create_modalias(acpi_dev, buf, size -1);
197 EXPORT_SYMBOL_GPL(acpi_device_modalias);
200 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
201 struct acpi_device *acpi_dev = to_acpi_device(dev);
204 len = create_modalias(acpi_dev, buf, 1024);
210 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
212 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
214 struct acpi_device_physical_node *pn;
217 mutex_lock(&adev->physical_node_lock);
219 list_for_each_entry(pn, &adev->physical_node_list, node)
220 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
222 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
228 mutex_unlock(&adev->physical_node_lock);
232 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
235 struct acpi_device *device = NULL;
236 struct acpi_device_physical_node *pn;
237 bool second_pass = (bool)data;
238 acpi_status status = AE_OK;
240 if (acpi_bus_get_device(handle, &device))
243 if (device->handler && !device->handler->hotplug.enabled) {
244 *ret_p = &device->dev;
248 mutex_lock(&device->physical_node_lock);
250 list_for_each_entry(pn, &device->physical_node_list, node) {
254 /* Skip devices offlined by the first pass. */
258 pn->put_online = false;
260 ret = device_offline(pn->dev);
261 if (acpi_force_hot_remove)
265 pn->put_online = !ret;
275 mutex_unlock(&device->physical_node_lock);
280 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
283 struct acpi_device *device = NULL;
284 struct acpi_device_physical_node *pn;
286 if (acpi_bus_get_device(handle, &device))
289 mutex_lock(&device->physical_node_lock);
291 list_for_each_entry(pn, &device->physical_node_list, node)
292 if (pn->put_online) {
293 device_online(pn->dev);
294 pn->put_online = false;
297 mutex_unlock(&device->physical_node_lock);
302 static int acpi_scan_try_to_offline(struct acpi_device *device)
304 acpi_handle handle = device->handle;
305 struct device *errdev = NULL;
309 * Carry out two passes here and ignore errors in the first pass,
310 * because if the devices in question are memory blocks and
311 * CONFIG_MEMCG is set, one of the blocks may hold data structures
312 * that the other blocks depend on, but it is not known in advance which
315 * If the first pass is successful, the second one isn't needed, though.
317 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
318 NULL, acpi_bus_offline, (void *)false,
320 if (status == AE_SUPPORT) {
321 dev_warn(errdev, "Offline disabled.\n");
322 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
323 acpi_bus_online, NULL, NULL, NULL);
326 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
329 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
330 NULL, acpi_bus_offline, (void *)true,
332 if (!errdev || acpi_force_hot_remove)
333 acpi_bus_offline(handle, 0, (void *)true,
336 if (errdev && !acpi_force_hot_remove) {
337 dev_warn(errdev, "Offline failed.\n");
338 acpi_bus_online(handle, 0, NULL, NULL);
339 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
340 ACPI_UINT32_MAX, acpi_bus_online,
348 static int acpi_scan_hot_remove(struct acpi_device *device)
350 acpi_handle handle = device->handle;
351 unsigned long long sta;
354 if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) {
355 if (!acpi_scan_is_offline(device, true))
358 int error = acpi_scan_try_to_offline(device);
363 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
364 "Hot-removing device %s...\n", dev_name(&device->dev)));
366 acpi_bus_trim(device);
368 acpi_evaluate_lck(handle, 0);
372 status = acpi_evaluate_ej0(handle);
373 if (status == AE_NOT_FOUND)
375 else if (ACPI_FAILURE(status))
379 * Verify if eject was indeed successful. If not, log an error
380 * message. No need to call _OST since _EJ0 call was made OK.
382 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
383 if (ACPI_FAILURE(status)) {
384 acpi_handle_warn(handle,
385 "Status check after eject failed (0x%x)\n", status);
386 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
387 acpi_handle_warn(handle,
388 "Eject incomplete - status 0x%llx\n", sta);
394 static int acpi_scan_device_not_present(struct acpi_device *adev)
396 if (!acpi_device_enumerated(adev)) {
397 dev_warn(&adev->dev, "Still not present\n");
404 static int acpi_scan_device_check(struct acpi_device *adev)
408 acpi_bus_get_status(adev);
409 if (adev->status.present || adev->status.functional) {
411 * This function is only called for device objects for which
412 * matching scan handlers exist. The only situation in which
413 * the scan handler is not attached to this device object yet
414 * is when the device has just appeared (either it wasn't
415 * present at all before or it was removed and then added
419 dev_warn(&adev->dev, "Already enumerated\n");
422 error = acpi_bus_scan(adev->handle);
424 dev_warn(&adev->dev, "Namespace scan failure\n");
427 if (!adev->handler) {
428 dev_warn(&adev->dev, "Enumeration failure\n");
432 error = acpi_scan_device_not_present(adev);
437 static int acpi_scan_bus_check(struct acpi_device *adev)
439 struct acpi_scan_handler *handler = adev->handler;
440 struct acpi_device *child;
443 acpi_bus_get_status(adev);
444 if (!(adev->status.present || adev->status.functional)) {
445 acpi_scan_device_not_present(adev);
448 if (handler && handler->hotplug.scan_dependent)
449 return handler->hotplug.scan_dependent(adev);
451 error = acpi_bus_scan(adev->handle);
453 dev_warn(&adev->dev, "Namespace scan failure\n");
456 list_for_each_entry(child, &adev->children, node) {
457 error = acpi_scan_bus_check(child);
464 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
467 case ACPI_NOTIFY_BUS_CHECK:
468 return acpi_scan_bus_check(adev);
469 case ACPI_NOTIFY_DEVICE_CHECK:
470 return acpi_scan_device_check(adev);
471 case ACPI_NOTIFY_EJECT_REQUEST:
472 case ACPI_OST_EC_OSPM_EJECT:
473 if (adev->handler && !adev->handler->hotplug.enabled) {
474 dev_info(&adev->dev, "Eject disabled\n");
477 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
478 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
479 return acpi_scan_hot_remove(adev);
484 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
486 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
489 lock_device_hotplug();
490 mutex_lock(&acpi_scan_lock);
493 * The device object's ACPI handle cannot become invalid as long as we
494 * are holding acpi_scan_lock, but it might have become invalid before
495 * that lock was acquired.
497 if (adev->handle == INVALID_ACPI_HANDLE)
500 if (adev->flags.is_dock_station) {
501 error = dock_notify(adev, src);
502 } else if (adev->flags.hotplug_notify) {
503 error = acpi_generic_hotplug_event(adev, src);
504 if (error == -EPERM) {
505 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
509 int (*notify)(struct acpi_device *, u32);
511 acpi_lock_hp_context();
512 notify = adev->hp ? adev->hp->notify : NULL;
513 acpi_unlock_hp_context();
515 * There may be additional notify handlers for device objects
516 * without the .event() callback, so ignore them here.
519 error = notify(adev, src);
524 ost_code = ACPI_OST_SC_SUCCESS;
527 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
530 acpi_bus_put_acpi_device(adev);
531 mutex_unlock(&acpi_scan_lock);
532 unlock_device_hotplug();
535 static ssize_t real_power_state_show(struct device *dev,
536 struct device_attribute *attr, char *buf)
538 struct acpi_device *adev = to_acpi_device(dev);
542 ret = acpi_device_get_power(adev, &state);
546 return sprintf(buf, "%s\n", acpi_power_state_string(state));
549 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
551 static ssize_t power_state_show(struct device *dev,
552 struct device_attribute *attr, char *buf)
554 struct acpi_device *adev = to_acpi_device(dev);
556 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
559 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
562 acpi_eject_store(struct device *d, struct device_attribute *attr,
563 const char *buf, size_t count)
565 struct acpi_device *acpi_device = to_acpi_device(d);
566 acpi_object_type not_used;
569 if (!count || buf[0] != '1')
572 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
573 && !acpi_device->driver)
576 status = acpi_get_type(acpi_device->handle, ¬_used);
577 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
580 get_device(&acpi_device->dev);
581 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
582 if (ACPI_SUCCESS(status))
585 put_device(&acpi_device->dev);
586 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
587 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
588 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
591 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
594 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
595 struct acpi_device *acpi_dev = to_acpi_device(dev);
597 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
599 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
601 static ssize_t acpi_device_uid_show(struct device *dev,
602 struct device_attribute *attr, char *buf)
604 struct acpi_device *acpi_dev = to_acpi_device(dev);
606 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
608 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
610 static ssize_t acpi_device_adr_show(struct device *dev,
611 struct device_attribute *attr, char *buf)
613 struct acpi_device *acpi_dev = to_acpi_device(dev);
615 return sprintf(buf, "0x%08x\n",
616 (unsigned int)(acpi_dev->pnp.bus_address));
618 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
621 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
622 struct acpi_device *acpi_dev = to_acpi_device(dev);
623 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
626 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
630 result = sprintf(buf, "%s\n", (char*)path.pointer);
635 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
637 /* sysfs file that shows description text from the ACPI _STR method */
638 static ssize_t description_show(struct device *dev,
639 struct device_attribute *attr,
641 struct acpi_device *acpi_dev = to_acpi_device(dev);
644 if (acpi_dev->pnp.str_obj == NULL)
648 * The _STR object contains a Unicode identifier for a device.
649 * We need to convert to utf-8 so it can be displayed.
651 result = utf16s_to_utf8s(
652 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
653 acpi_dev->pnp.str_obj->buffer.length,
654 UTF16_LITTLE_ENDIAN, buf,
657 buf[result++] = '\n';
661 static DEVICE_ATTR(description, 0444, description_show, NULL);
664 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
666 struct acpi_device *acpi_dev = to_acpi_device(dev);
668 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
670 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
672 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
674 struct acpi_device *acpi_dev = to_acpi_device(dev);
676 unsigned long long sta;
678 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
679 if (ACPI_FAILURE(status))
682 return sprintf(buf, "%llu\n", sta);
684 static DEVICE_ATTR_RO(status);
686 static int acpi_device_setup_files(struct acpi_device *dev)
688 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
690 unsigned long long sun;
694 * Devices gotten from FADT don't have a "path" attribute
697 result = device_create_file(&dev->dev, &dev_attr_path);
702 if (!list_empty(&dev->pnp.ids)) {
703 result = device_create_file(&dev->dev, &dev_attr_hid);
707 result = device_create_file(&dev->dev, &dev_attr_modalias);
713 * If device has _STR, 'description' file is created
715 if (acpi_has_method(dev->handle, "_STR")) {
716 status = acpi_evaluate_object(dev->handle, "_STR",
718 if (ACPI_FAILURE(status))
719 buffer.pointer = NULL;
720 dev->pnp.str_obj = buffer.pointer;
721 result = device_create_file(&dev->dev, &dev_attr_description);
726 if (dev->pnp.type.bus_address)
727 result = device_create_file(&dev->dev, &dev_attr_adr);
728 if (dev->pnp.unique_id)
729 result = device_create_file(&dev->dev, &dev_attr_uid);
731 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
732 if (ACPI_SUCCESS(status)) {
733 dev->pnp.sun = (unsigned long)sun;
734 result = device_create_file(&dev->dev, &dev_attr_sun);
738 dev->pnp.sun = (unsigned long)-1;
741 if (acpi_has_method(dev->handle, "_STA")) {
742 result = device_create_file(&dev->dev, &dev_attr_status);
748 * If device has _EJ0, 'eject' file is created that is used to trigger
749 * hot-removal function from userland.
751 if (acpi_has_method(dev->handle, "_EJ0")) {
752 result = device_create_file(&dev->dev, &dev_attr_eject);
757 if (dev->flags.power_manageable) {
758 result = device_create_file(&dev->dev, &dev_attr_power_state);
762 if (dev->power.flags.power_resources)
763 result = device_create_file(&dev->dev,
764 &dev_attr_real_power_state);
771 static void acpi_device_remove_files(struct acpi_device *dev)
773 if (dev->flags.power_manageable) {
774 device_remove_file(&dev->dev, &dev_attr_power_state);
775 if (dev->power.flags.power_resources)
776 device_remove_file(&dev->dev,
777 &dev_attr_real_power_state);
781 * If device has _STR, remove 'description' file
783 if (acpi_has_method(dev->handle, "_STR")) {
784 kfree(dev->pnp.str_obj);
785 device_remove_file(&dev->dev, &dev_attr_description);
788 * If device has _EJ0, remove 'eject' file.
790 if (acpi_has_method(dev->handle, "_EJ0"))
791 device_remove_file(&dev->dev, &dev_attr_eject);
793 if (acpi_has_method(dev->handle, "_SUN"))
794 device_remove_file(&dev->dev, &dev_attr_sun);
796 if (dev->pnp.unique_id)
797 device_remove_file(&dev->dev, &dev_attr_uid);
798 if (dev->pnp.type.bus_address)
799 device_remove_file(&dev->dev, &dev_attr_adr);
800 device_remove_file(&dev->dev, &dev_attr_modalias);
801 device_remove_file(&dev->dev, &dev_attr_hid);
802 if (acpi_has_method(dev->handle, "_STA"))
803 device_remove_file(&dev->dev, &dev_attr_status);
805 device_remove_file(&dev->dev, &dev_attr_path);
807 /* --------------------------------------------------------------------------
809 -------------------------------------------------------------------------- */
811 static const struct acpi_device_id *__acpi_match_device(
812 struct acpi_device *device, const struct acpi_device_id *ids)
814 const struct acpi_device_id *id;
815 struct acpi_hardware_id *hwid;
818 * If the device is not present, it is unnecessary to load device
821 if (!device->status.present)
824 for (id = ids; id->id[0]; id++)
825 list_for_each_entry(hwid, &device->pnp.ids, list)
826 if (!strcmp((char *) id->id, hwid->id))
833 * acpi_match_device - Match a struct device against a given list of ACPI IDs
834 * @ids: Array of struct acpi_device_id object to match against.
835 * @dev: The device structure to match.
837 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
838 * object for that handle and use that object to match against a given list of
841 * Return a pointer to the first matching ID on success or %NULL on failure.
843 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
844 const struct device *dev)
846 struct acpi_device *adev;
847 acpi_handle handle = ACPI_HANDLE(dev);
849 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
852 return __acpi_match_device(adev, ids);
854 EXPORT_SYMBOL_GPL(acpi_match_device);
856 int acpi_match_device_ids(struct acpi_device *device,
857 const struct acpi_device_id *ids)
859 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
861 EXPORT_SYMBOL(acpi_match_device_ids);
863 static void acpi_free_power_resources_lists(struct acpi_device *device)
867 if (device->wakeup.flags.valid)
868 acpi_power_resources_list_free(&device->wakeup.resources);
870 if (!device->flags.power_manageable)
873 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
874 struct acpi_device_power_state *ps = &device->power.states[i];
875 acpi_power_resources_list_free(&ps->resources);
879 static void acpi_device_release(struct device *dev)
881 struct acpi_device *acpi_dev = to_acpi_device(dev);
883 acpi_free_pnp_ids(&acpi_dev->pnp);
884 acpi_free_power_resources_lists(acpi_dev);
888 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
890 struct acpi_device *acpi_dev = to_acpi_device(dev);
891 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
893 return acpi_dev->flags.match_driver
894 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
897 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
899 struct acpi_device *acpi_dev = to_acpi_device(dev);
902 if (list_empty(&acpi_dev->pnp.ids))
905 if (add_uevent_var(env, "MODALIAS="))
907 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
908 sizeof(env->buf) - env->buflen);
915 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
917 struct acpi_device *device = data;
919 device->driver->ops.notify(device, event);
922 static acpi_status acpi_device_notify_fixed(void *data)
924 struct acpi_device *device = data;
926 /* Fixed hardware devices have no handles */
927 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
931 static int acpi_device_install_notify_handler(struct acpi_device *device)
935 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
937 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
938 acpi_device_notify_fixed,
940 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
942 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
943 acpi_device_notify_fixed,
946 status = acpi_install_notify_handler(device->handle,
951 if (ACPI_FAILURE(status))
956 static void acpi_device_remove_notify_handler(struct acpi_device *device)
958 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
959 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
960 acpi_device_notify_fixed);
961 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
962 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
963 acpi_device_notify_fixed);
965 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
969 static int acpi_device_probe(struct device *dev)
971 struct acpi_device *acpi_dev = to_acpi_device(dev);
972 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
975 if (acpi_dev->handler)
978 if (!acpi_drv->ops.add)
981 ret = acpi_drv->ops.add(acpi_dev);
985 acpi_dev->driver = acpi_drv;
986 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
987 "Driver [%s] successfully bound to device [%s]\n",
988 acpi_drv->name, acpi_dev->pnp.bus_id));
990 if (acpi_drv->ops.notify) {
991 ret = acpi_device_install_notify_handler(acpi_dev);
993 if (acpi_drv->ops.remove)
994 acpi_drv->ops.remove(acpi_dev);
996 acpi_dev->driver = NULL;
997 acpi_dev->driver_data = NULL;
1002 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1003 acpi_drv->name, acpi_dev->pnp.bus_id));
1008 static int acpi_device_remove(struct device * dev)
1010 struct acpi_device *acpi_dev = to_acpi_device(dev);
1011 struct acpi_driver *acpi_drv = acpi_dev->driver;
1014 if (acpi_drv->ops.notify)
1015 acpi_device_remove_notify_handler(acpi_dev);
1016 if (acpi_drv->ops.remove)
1017 acpi_drv->ops.remove(acpi_dev);
1019 acpi_dev->driver = NULL;
1020 acpi_dev->driver_data = NULL;
1026 struct bus_type acpi_bus_type = {
1028 .match = acpi_bus_match,
1029 .probe = acpi_device_probe,
1030 .remove = acpi_device_remove,
1031 .uevent = acpi_device_uevent,
1034 static void acpi_device_del(struct acpi_device *device)
1036 mutex_lock(&acpi_device_lock);
1038 list_del(&device->node);
1040 list_del(&device->wakeup_list);
1041 mutex_unlock(&acpi_device_lock);
1043 acpi_power_add_remove_device(device, false);
1044 acpi_device_remove_files(device);
1046 device->remove(device);
1048 device_del(&device->dev);
1051 static LIST_HEAD(acpi_device_del_list);
1052 static DEFINE_MUTEX(acpi_device_del_lock);
1054 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1057 struct acpi_device *adev;
1059 mutex_lock(&acpi_device_del_lock);
1061 if (list_empty(&acpi_device_del_list)) {
1062 mutex_unlock(&acpi_device_del_lock);
1065 adev = list_first_entry(&acpi_device_del_list,
1066 struct acpi_device, del_list);
1067 list_del(&adev->del_list);
1069 mutex_unlock(&acpi_device_del_lock);
1071 acpi_device_del(adev);
1073 * Drop references to all power resources that might have been
1074 * used by the device.
1076 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1077 put_device(&adev->dev);
1082 * acpi_scan_drop_device - Drop an ACPI device object.
1083 * @handle: Handle of an ACPI namespace node, not used.
1084 * @context: Address of the ACPI device object to drop.
1086 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1087 * namespace node the device object pointed to by @context is attached to.
1089 * The unregistration is carried out asynchronously to avoid running
1090 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1091 * ensure the correct ordering (the device objects must be unregistered in the
1092 * same order in which the corresponding namespace nodes are deleted).
1094 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1096 static DECLARE_WORK(work, acpi_device_del_work_fn);
1097 struct acpi_device *adev = context;
1099 mutex_lock(&acpi_device_del_lock);
1102 * Use the ACPI hotplug workqueue which is ordered, so this work item
1103 * won't run after any hotplug work items submitted subsequently. That
1104 * prevents attempts to register device objects identical to those being
1105 * deleted from happening concurrently (such attempts result from
1106 * hotplug events handled via the ACPI hotplug workqueue). It also will
1107 * run after all of the work items submitted previosuly, which helps
1108 * those work items to ensure that they are not accessing stale device
1111 if (list_empty(&acpi_device_del_list))
1112 acpi_queue_hotplug_work(&work);
1114 list_add_tail(&adev->del_list, &acpi_device_del_list);
1115 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1116 adev->handle = INVALID_ACPI_HANDLE;
1118 mutex_unlock(&acpi_device_del_lock);
1121 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1122 void (*callback)(void *))
1129 status = acpi_get_data_full(handle, acpi_scan_drop_device,
1130 (void **)device, callback);
1131 if (ACPI_FAILURE(status) || !*device) {
1132 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1139 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1141 return acpi_get_device_data(handle, device, NULL);
1143 EXPORT_SYMBOL(acpi_bus_get_device);
1145 static void get_acpi_device(void *dev)
1148 get_device(&((struct acpi_device *)dev)->dev);
1151 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1153 struct acpi_device *adev = NULL;
1155 acpi_get_device_data(handle, &adev, get_acpi_device);
1159 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1161 put_device(&adev->dev);
1164 int acpi_device_add(struct acpi_device *device,
1165 void (*release)(struct device *))
1168 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1171 if (device->handle) {
1174 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1176 if (ACPI_FAILURE(status)) {
1177 acpi_handle_err(device->handle,
1178 "Unable to attach device data\n");
1186 * Link this device to its parent and siblings.
1188 INIT_LIST_HEAD(&device->children);
1189 INIT_LIST_HEAD(&device->node);
1190 INIT_LIST_HEAD(&device->wakeup_list);
1191 INIT_LIST_HEAD(&device->physical_node_list);
1192 INIT_LIST_HEAD(&device->del_list);
1193 mutex_init(&device->physical_node_lock);
1195 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1197 pr_err(PREFIX "Memory allocation error\n");
1202 mutex_lock(&acpi_device_lock);
1204 * Find suitable bus_id and instance number in acpi_bus_id_list
1205 * If failed, create one and link it into acpi_bus_id_list
1207 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1208 if (!strcmp(acpi_device_bus_id->bus_id,
1209 acpi_device_hid(device))) {
1210 acpi_device_bus_id->instance_no++;
1217 acpi_device_bus_id = new_bus_id;
1218 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1219 acpi_device_bus_id->instance_no = 0;
1220 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1222 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1225 list_add_tail(&device->node, &device->parent->children);
1227 if (device->wakeup.flags.valid)
1228 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1229 mutex_unlock(&acpi_device_lock);
1232 device->dev.parent = &device->parent->dev;
1233 device->dev.bus = &acpi_bus_type;
1234 device->dev.release = release;
1235 result = device_add(&device->dev);
1237 dev_err(&device->dev, "Error registering device\n");
1241 result = acpi_device_setup_files(device);
1243 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1244 dev_name(&device->dev));
1249 mutex_lock(&acpi_device_lock);
1251 list_del(&device->node);
1252 list_del(&device->wakeup_list);
1253 mutex_unlock(&acpi_device_lock);
1256 acpi_detach_data(device->handle, acpi_scan_drop_device);
1260 /* --------------------------------------------------------------------------
1262 -------------------------------------------------------------------------- */
1264 * acpi_bus_register_driver - register a driver with the ACPI bus
1265 * @driver: driver being registered
1267 * Registers a driver with the ACPI bus. Searches the namespace for all
1268 * devices that match the driver's criteria and binds. Returns zero for
1269 * success or a negative error status for failure.
1271 int acpi_bus_register_driver(struct acpi_driver *driver)
1277 driver->drv.name = driver->name;
1278 driver->drv.bus = &acpi_bus_type;
1279 driver->drv.owner = driver->owner;
1281 ret = driver_register(&driver->drv);
1285 EXPORT_SYMBOL(acpi_bus_register_driver);
1288 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1289 * @driver: driver to unregister
1291 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1292 * devices that match the driver's criteria and unbinds.
1294 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1296 driver_unregister(&driver->drv);
1299 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1301 /* --------------------------------------------------------------------------
1303 -------------------------------------------------------------------------- */
1304 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1306 struct acpi_device *device = NULL;
1310 * Fixed hardware devices do not appear in the namespace and do not
1311 * have handles, but we fabricate acpi_devices for them, so we have
1312 * to deal with them specially.
1318 status = acpi_get_parent(handle, &handle);
1319 if (ACPI_FAILURE(status))
1320 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1321 } while (acpi_bus_get_device(handle, &device));
1326 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1330 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1331 union acpi_object *obj;
1333 status = acpi_get_handle(handle, "_EJD", &tmp);
1334 if (ACPI_FAILURE(status))
1337 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1338 if (ACPI_SUCCESS(status)) {
1339 obj = buffer.pointer;
1340 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1342 kfree(buffer.pointer);
1346 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1348 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1349 struct acpi_device_wakeup *wakeup)
1351 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1352 union acpi_object *package = NULL;
1353 union acpi_object *element = NULL;
1360 INIT_LIST_HEAD(&wakeup->resources);
1363 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1364 if (ACPI_FAILURE(status)) {
1365 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1369 package = (union acpi_object *)buffer.pointer;
1371 if (!package || package->package.count < 2)
1374 element = &(package->package.elements[0]);
1378 if (element->type == ACPI_TYPE_PACKAGE) {
1379 if ((element->package.count < 2) ||
1380 (element->package.elements[0].type !=
1381 ACPI_TYPE_LOCAL_REFERENCE)
1382 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1385 wakeup->gpe_device =
1386 element->package.elements[0].reference.handle;
1387 wakeup->gpe_number =
1388 (u32) element->package.elements[1].integer.value;
1389 } else if (element->type == ACPI_TYPE_INTEGER) {
1390 wakeup->gpe_device = NULL;
1391 wakeup->gpe_number = element->integer.value;
1396 element = &(package->package.elements[1]);
1397 if (element->type != ACPI_TYPE_INTEGER)
1400 wakeup->sleep_state = element->integer.value;
1402 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1406 if (!list_empty(&wakeup->resources)) {
1409 err = acpi_power_wakeup_list_init(&wakeup->resources,
1412 acpi_handle_warn(handle, "Retrieving current states "
1413 "of wakeup power resources failed\n");
1414 acpi_power_resources_list_free(&wakeup->resources);
1417 if (sleep_state < wakeup->sleep_state) {
1418 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1419 "(S%d) by S%d from power resources\n",
1420 (int)wakeup->sleep_state, sleep_state);
1421 wakeup->sleep_state = sleep_state;
1424 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1427 kfree(buffer.pointer);
1431 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1433 struct acpi_device_id button_device_ids[] = {
1440 acpi_event_status event_status;
1442 device->wakeup.flags.notifier_present = 0;
1444 /* Power button, Lid switch always enable wakeup */
1445 if (!acpi_match_device_ids(device, button_device_ids)) {
1446 device->wakeup.flags.run_wake = 1;
1447 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1448 /* Do not use Lid/sleep button for S5 wakeup */
1449 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1450 device->wakeup.sleep_state = ACPI_STATE_S4;
1452 device_set_wakeup_capable(&device->dev, true);
1456 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1457 device->wakeup.gpe_number,
1459 if (status == AE_OK)
1460 device->wakeup.flags.run_wake =
1461 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1464 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1468 /* Presence of _PRW indicates wake capable */
1469 if (!acpi_has_method(device->handle, "_PRW"))
1472 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1475 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1479 device->wakeup.flags.valid = 1;
1480 device->wakeup.prepare_count = 0;
1481 acpi_bus_set_run_wake_flags(device);
1482 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1483 * system for the ACPI device with the _PRW object.
1484 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1485 * So it is necessary to call _DSW object first. Only when it is not
1486 * present will the _PSW object used.
1488 err = acpi_device_sleep_wake(device, 0, 0, 0);
1490 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1491 "error in _DSW or _PSW evaluation\n"));
1494 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1496 struct acpi_device_power_state *ps = &device->power.states[state];
1497 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1498 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1501 INIT_LIST_HEAD(&ps->resources);
1503 /* Evaluate "_PRx" to get referenced power resources */
1504 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1505 if (ACPI_SUCCESS(status)) {
1506 union acpi_object *package = buffer.pointer;
1508 if (buffer.length && package
1509 && package->type == ACPI_TYPE_PACKAGE
1510 && package->package.count) {
1511 int err = acpi_extract_power_resources(package, 0,
1514 device->power.flags.power_resources = 1;
1516 ACPI_FREE(buffer.pointer);
1519 /* Evaluate "_PSx" to see if we can do explicit sets */
1521 if (acpi_has_method(device->handle, pathname))
1522 ps->flags.explicit_set = 1;
1525 * State is valid if there are means to put the device into it.
1526 * D3hot is only valid if _PR3 present.
1528 if (!list_empty(&ps->resources)
1529 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1530 ps->flags.valid = 1;
1531 ps->flags.os_accessible = 1;
1534 ps->power = -1; /* Unknown - driver assigned */
1535 ps->latency = -1; /* Unknown - driver assigned */
1538 static void acpi_bus_get_power_flags(struct acpi_device *device)
1542 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1543 if (!acpi_has_method(device->handle, "_PS0") &&
1544 !acpi_has_method(device->handle, "_PR0"))
1547 device->flags.power_manageable = 1;
1550 * Power Management Flags
1552 if (acpi_has_method(device->handle, "_PSC"))
1553 device->power.flags.explicit_get = 1;
1555 if (acpi_has_method(device->handle, "_IRC"))
1556 device->power.flags.inrush_current = 1;
1558 if (acpi_has_method(device->handle, "_DSW"))
1559 device->power.flags.dsw_present = 1;
1562 * Enumerate supported power management states
1564 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1565 acpi_bus_init_power_state(device, i);
1567 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1569 /* Set defaults for D0 and D3 states (always valid) */
1570 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1571 device->power.states[ACPI_STATE_D0].power = 100;
1572 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1573 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1575 /* Set D3cold's explicit_set flag if _PS3 exists. */
1576 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1577 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1579 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1580 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1581 device->power.flags.power_resources)
1582 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1584 if (acpi_bus_init_power(device)) {
1585 acpi_free_power_resources_lists(device);
1586 device->flags.power_manageable = 0;
1590 static void acpi_bus_get_flags(struct acpi_device *device)
1592 /* Presence of _STA indicates 'dynamic_status' */
1593 if (acpi_has_method(device->handle, "_STA"))
1594 device->flags.dynamic_status = 1;
1596 /* Presence of _RMV indicates 'removable' */
1597 if (acpi_has_method(device->handle, "_RMV"))
1598 device->flags.removable = 1;
1600 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1601 if (acpi_has_method(device->handle, "_EJD") ||
1602 acpi_has_method(device->handle, "_EJ0"))
1603 device->flags.ejectable = 1;
1606 static void acpi_device_get_busid(struct acpi_device *device)
1608 char bus_id[5] = { '?', 0 };
1609 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1615 * The device's Bus ID is simply the object name.
1616 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1618 if (ACPI_IS_ROOT_DEVICE(device)) {
1619 strcpy(device->pnp.bus_id, "ACPI");
1623 switch (device->device_type) {
1624 case ACPI_BUS_TYPE_POWER_BUTTON:
1625 strcpy(device->pnp.bus_id, "PWRF");
1627 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1628 strcpy(device->pnp.bus_id, "SLPF");
1631 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1632 /* Clean up trailing underscores (if any) */
1633 for (i = 3; i > 1; i--) {
1634 if (bus_id[i] == '_')
1639 strcpy(device->pnp.bus_id, bus_id);
1645 * acpi_ata_match - see if an acpi object is an ATA device
1647 * If an acpi object has one of the ACPI ATA methods defined,
1648 * then we can safely call it an ATA device.
1650 bool acpi_ata_match(acpi_handle handle)
1652 return acpi_has_method(handle, "_GTF") ||
1653 acpi_has_method(handle, "_GTM") ||
1654 acpi_has_method(handle, "_STM") ||
1655 acpi_has_method(handle, "_SDD");
1659 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1661 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1662 * then we can safely call it an ejectable drive bay
1664 bool acpi_bay_match(acpi_handle handle)
1666 acpi_handle phandle;
1668 if (!acpi_has_method(handle, "_EJ0"))
1670 if (acpi_ata_match(handle))
1672 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1675 return acpi_ata_match(phandle);
1678 bool acpi_device_is_battery(struct acpi_device *adev)
1680 struct acpi_hardware_id *hwid;
1682 list_for_each_entry(hwid, &adev->pnp.ids, list)
1683 if (!strcmp("PNP0C0A", hwid->id))
1689 static bool is_ejectable_bay(struct acpi_device *adev)
1691 acpi_handle handle = adev->handle;
1693 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1696 return acpi_bay_match(handle);
1700 * acpi_dock_match - see if an acpi object has a _DCK method
1702 bool acpi_dock_match(acpi_handle handle)
1704 return acpi_has_method(handle, "_DCK");
1707 const char *acpi_device_hid(struct acpi_device *device)
1709 struct acpi_hardware_id *hid;
1711 if (list_empty(&device->pnp.ids))
1714 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1717 EXPORT_SYMBOL(acpi_device_hid);
1719 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1721 struct acpi_hardware_id *id;
1723 id = kmalloc(sizeof(*id), GFP_KERNEL);
1727 id->id = kstrdup(dev_id, GFP_KERNEL);
1733 list_add_tail(&id->list, &pnp->ids);
1734 pnp->type.hardware_id = 1;
1738 * Old IBM workstations have a DSDT bug wherein the SMBus object
1739 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1740 * prefix. Work around this.
1742 static bool acpi_ibm_smbus_match(acpi_handle handle)
1744 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1745 struct acpi_buffer path = { sizeof(node_name), node_name };
1747 if (!dmi_name_in_vendors("IBM"))
1750 /* Look for SMBS object */
1751 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1752 strcmp("SMBS", path.pointer))
1755 /* Does it have the necessary (but misnamed) methods? */
1756 if (acpi_has_method(handle, "SBI") &&
1757 acpi_has_method(handle, "SBR") &&
1758 acpi_has_method(handle, "SBW"))
1764 static bool acpi_object_is_system_bus(acpi_handle handle)
1768 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1771 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1778 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1782 struct acpi_device_info *info;
1783 struct acpi_pnp_device_id_list *cid_list;
1786 switch (device_type) {
1787 case ACPI_BUS_TYPE_DEVICE:
1788 if (handle == ACPI_ROOT_OBJECT) {
1789 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1793 status = acpi_get_object_info(handle, &info);
1794 if (ACPI_FAILURE(status)) {
1795 pr_err(PREFIX "%s: Error reading device info\n",
1800 if (info->valid & ACPI_VALID_HID) {
1801 acpi_add_id(pnp, info->hardware_id.string);
1802 pnp->type.platform_id = 1;
1804 if (info->valid & ACPI_VALID_CID) {
1805 cid_list = &info->compatible_id_list;
1806 for (i = 0; i < cid_list->count; i++)
1807 acpi_add_id(pnp, cid_list->ids[i].string);
1809 if (info->valid & ACPI_VALID_ADR) {
1810 pnp->bus_address = info->address;
1811 pnp->type.bus_address = 1;
1813 if (info->valid & ACPI_VALID_UID)
1814 pnp->unique_id = kstrdup(info->unique_id.string,
1820 * Some devices don't reliably have _HIDs & _CIDs, so add
1821 * synthetic HIDs to make sure drivers can find them.
1823 if (acpi_is_video_device(handle))
1824 acpi_add_id(pnp, ACPI_VIDEO_HID);
1825 else if (acpi_bay_match(handle))
1826 acpi_add_id(pnp, ACPI_BAY_HID);
1827 else if (acpi_dock_match(handle))
1828 acpi_add_id(pnp, ACPI_DOCK_HID);
1829 else if (acpi_ibm_smbus_match(handle))
1830 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1831 else if (list_empty(&pnp->ids) &&
1832 acpi_object_is_system_bus(handle)) {
1833 /* \_SB, \_TZ, LNXSYBUS */
1834 acpi_add_id(pnp, ACPI_BUS_HID);
1835 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1836 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1840 case ACPI_BUS_TYPE_POWER:
1841 acpi_add_id(pnp, ACPI_POWER_HID);
1843 case ACPI_BUS_TYPE_PROCESSOR:
1844 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1846 case ACPI_BUS_TYPE_THERMAL:
1847 acpi_add_id(pnp, ACPI_THERMAL_HID);
1849 case ACPI_BUS_TYPE_POWER_BUTTON:
1850 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1852 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1853 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1858 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1860 struct acpi_hardware_id *id, *tmp;
1862 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1866 kfree(pnp->unique_id);
1869 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1870 int type, unsigned long long sta)
1872 INIT_LIST_HEAD(&device->pnp.ids);
1873 device->device_type = type;
1874 device->handle = handle;
1875 device->parent = acpi_bus_get_parent(handle);
1876 acpi_set_device_status(device, sta);
1877 acpi_device_get_busid(device);
1878 acpi_set_pnp_ids(handle, &device->pnp, type);
1879 acpi_bus_get_flags(device);
1880 device->flags.match_driver = false;
1881 device->flags.initialized = true;
1882 device->flags.visited = false;
1883 device_initialize(&device->dev);
1884 dev_set_uevent_suppress(&device->dev, true);
1887 void acpi_device_add_finalize(struct acpi_device *device)
1889 dev_set_uevent_suppress(&device->dev, false);
1890 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1893 static int acpi_add_single_object(struct acpi_device **child,
1894 acpi_handle handle, int type,
1895 unsigned long long sta)
1898 struct acpi_device *device;
1899 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1901 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1903 printk(KERN_ERR PREFIX "Memory allocation error\n");
1907 acpi_init_device_object(device, handle, type, sta);
1908 acpi_bus_get_power_flags(device);
1909 acpi_bus_get_wakeup_device_flags(device);
1911 result = acpi_device_add(device, acpi_device_release);
1913 acpi_device_release(&device->dev);
1917 acpi_power_add_remove_device(device, true);
1918 acpi_device_add_finalize(device);
1919 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1920 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1921 dev_name(&device->dev), (char *) buffer.pointer,
1922 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1923 kfree(buffer.pointer);
1928 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1929 unsigned long long *sta)
1932 acpi_object_type acpi_type;
1934 status = acpi_get_type(handle, &acpi_type);
1935 if (ACPI_FAILURE(status))
1938 switch (acpi_type) {
1939 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1940 case ACPI_TYPE_DEVICE:
1941 *type = ACPI_BUS_TYPE_DEVICE;
1942 status = acpi_bus_get_status_handle(handle, sta);
1943 if (ACPI_FAILURE(status))
1946 case ACPI_TYPE_PROCESSOR:
1947 *type = ACPI_BUS_TYPE_PROCESSOR;
1948 status = acpi_bus_get_status_handle(handle, sta);
1949 if (ACPI_FAILURE(status))
1952 case ACPI_TYPE_THERMAL:
1953 *type = ACPI_BUS_TYPE_THERMAL;
1954 *sta = ACPI_STA_DEFAULT;
1956 case ACPI_TYPE_POWER:
1957 *type = ACPI_BUS_TYPE_POWER;
1958 *sta = ACPI_STA_DEFAULT;
1967 bool acpi_device_is_present(struct acpi_device *adev)
1969 if (adev->status.present || adev->status.functional)
1972 adev->flags.initialized = false;
1976 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1978 const struct acpi_device_id **matchid)
1980 const struct acpi_device_id *devid;
1983 return handler->match(idstr, matchid);
1985 for (devid = handler->ids; devid->id[0]; devid++)
1986 if (!strcmp((char *)devid->id, idstr)) {
1996 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1997 const struct acpi_device_id **matchid)
1999 struct acpi_scan_handler *handler;
2001 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2002 if (acpi_scan_handler_matching(handler, idstr, matchid))
2008 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2010 if (!!hotplug->enabled == !!val)
2013 mutex_lock(&acpi_scan_lock);
2015 hotplug->enabled = val;
2017 mutex_unlock(&acpi_scan_lock);
2020 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2022 struct acpi_hardware_id *hwid;
2024 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2025 acpi_dock_add(adev);
2028 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2029 struct acpi_scan_handler *handler;
2031 handler = acpi_scan_match_handler(hwid->id, NULL);
2033 adev->flags.hotplug_notify = true;
2039 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2040 void *not_used, void **return_value)
2042 struct acpi_device *device = NULL;
2044 unsigned long long sta;
2047 acpi_bus_get_device(handle, &device);
2051 result = acpi_bus_type_and_status(handle, &type, &sta);
2055 if (type == ACPI_BUS_TYPE_POWER) {
2056 acpi_add_power_resource(handle);
2060 acpi_add_single_object(&device, handle, type, sta);
2062 return AE_CTRL_DEPTH;
2064 acpi_scan_init_hotplug(device);
2068 *return_value = device;
2073 static int acpi_scan_attach_handler(struct acpi_device *device)
2075 struct acpi_hardware_id *hwid;
2078 list_for_each_entry(hwid, &device->pnp.ids, list) {
2079 const struct acpi_device_id *devid;
2080 struct acpi_scan_handler *handler;
2082 handler = acpi_scan_match_handler(hwid->id, &devid);
2084 device->handler = handler;
2085 ret = handler->attach(device, devid);
2089 device->handler = NULL;
2097 static void acpi_bus_attach(struct acpi_device *device)
2099 struct acpi_device *child;
2103 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2104 register_dock_dependent_device(device, ejd);
2106 acpi_bus_get_status(device);
2107 /* Skip devices that are not present. */
2108 if (!acpi_device_is_present(device)) {
2109 device->flags.visited = false;
2112 if (device->handler)
2115 if (!device->flags.initialized) {
2116 acpi_bus_update_power(device, NULL);
2117 device->flags.initialized = true;
2119 device->flags.visited = false;
2120 ret = acpi_scan_attach_handler(device);
2124 device->flags.match_driver = true;
2126 ret = device_attach(&device->dev);
2130 device->flags.visited = true;
2133 list_for_each_entry(child, &device->children, node)
2134 acpi_bus_attach(child);
2138 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2139 * @handle: Root of the namespace scope to scan.
2141 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2144 * If no devices were found, -ENODEV is returned, but it does not mean that
2145 * there has been a real error. There just have been no suitable ACPI objects
2146 * in the table trunk from which the kernel could create a device and add an
2147 * appropriate driver.
2149 * Must be called under acpi_scan_lock.
2151 int acpi_bus_scan(acpi_handle handle)
2153 void *device = NULL;
2155 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2156 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2157 acpi_bus_check_add, NULL, NULL, &device);
2160 acpi_bus_attach(device);
2165 EXPORT_SYMBOL(acpi_bus_scan);
2168 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2169 * @adev: Root of the ACPI namespace scope to walk.
2171 * Must be called under acpi_scan_lock.
2173 void acpi_bus_trim(struct acpi_device *adev)
2175 struct acpi_scan_handler *handler = adev->handler;
2176 struct acpi_device *child;
2178 list_for_each_entry_reverse(child, &adev->children, node)
2179 acpi_bus_trim(child);
2181 adev->flags.match_driver = false;
2183 if (handler->detach)
2184 handler->detach(adev);
2186 adev->handler = NULL;
2188 device_release_driver(&adev->dev);
2191 * Most likely, the device is going away, so put it into D3cold before
2194 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2195 adev->flags.initialized = false;
2196 adev->flags.visited = false;
2198 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2200 static int acpi_bus_scan_fixed(void)
2205 * Enumerate all fixed-feature devices.
2207 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2208 struct acpi_device *device = NULL;
2210 result = acpi_add_single_object(&device, NULL,
2211 ACPI_BUS_TYPE_POWER_BUTTON,
2216 device->flags.match_driver = true;
2217 result = device_attach(&device->dev);
2221 device_init_wakeup(&device->dev, true);
2224 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2225 struct acpi_device *device = NULL;
2227 result = acpi_add_single_object(&device, NULL,
2228 ACPI_BUS_TYPE_SLEEP_BUTTON,
2233 device->flags.match_driver = true;
2234 result = device_attach(&device->dev);
2237 return result < 0 ? result : 0;
2240 int __init acpi_scan_init(void)
2244 result = bus_register(&acpi_bus_type);
2246 /* We don't want to quit even if we failed to add suspend/resume */
2247 printk(KERN_ERR PREFIX "Could not register bus type\n");
2250 acpi_pci_root_init();
2251 acpi_pci_link_init();
2252 acpi_processor_init();
2253 acpi_platform_init();
2255 acpi_cmos_rtc_init();
2256 acpi_container_init();
2257 acpi_memory_hotplug_init();
2260 mutex_lock(&acpi_scan_lock);
2262 * Enumerate devices in the ACPI namespace.
2264 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2268 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2272 result = acpi_bus_scan_fixed();
2274 acpi_detach_data(acpi_root->handle, acpi_scan_drop_device);
2275 acpi_device_del(acpi_root);
2276 put_device(&acpi_root->dev);
2280 acpi_update_all_gpes();
2283 mutex_unlock(&acpi_scan_lock);