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();
82 acpi_set_hp_context(adev, hp);
83 acpi_unlock_hp_context();
85 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
87 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
92 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
96 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
97 const char *hotplug_profile_name)
101 error = acpi_scan_add_handler(handler);
105 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
110 * Creates hid/cid(s) string needed for modalias and uevent
111 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
112 * char *modalias: "acpi:IBM0001:ACPI0001"
113 * Return: 0: no _HID and no _CID
114 * -EINVAL: output error
115 * -ENOMEM: output is truncated
117 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
122 struct acpi_hardware_id *id;
124 if (list_empty(&acpi_dev->pnp.ids))
127 len = snprintf(modalias, size, "acpi:");
130 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
131 count = snprintf(&modalias[len], size, "%s:", id->id);
140 modalias[len] = '\0';
145 * Creates uevent modalias field for ACPI enumerated devices.
146 * Because the other buses does not support ACPI HIDs & CIDs.
147 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
148 * "acpi:IBM0001:ACPI0001"
150 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
152 struct acpi_device *acpi_dev;
155 acpi_dev = ACPI_COMPANION(dev);
159 /* Fall back to bus specific way of modalias exporting */
160 if (list_empty(&acpi_dev->pnp.ids))
163 if (add_uevent_var(env, "MODALIAS="))
165 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
166 sizeof(env->buf) - env->buflen);
172 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
175 * Creates modalias sysfs attribute for ACPI enumerated devices.
176 * Because the other buses does not support ACPI HIDs & CIDs.
177 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
178 * "acpi:IBM0001:ACPI0001"
180 int acpi_device_modalias(struct device *dev, char *buf, int size)
182 struct acpi_device *acpi_dev;
185 acpi_dev = ACPI_COMPANION(dev);
189 /* Fall back to bus specific way of modalias exporting */
190 if (list_empty(&acpi_dev->pnp.ids))
193 len = create_modalias(acpi_dev, buf, size -1);
199 EXPORT_SYMBOL_GPL(acpi_device_modalias);
202 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
203 struct acpi_device *acpi_dev = to_acpi_device(dev);
206 len = create_modalias(acpi_dev, buf, 1024);
212 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
214 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
216 struct acpi_device_physical_node *pn;
219 mutex_lock(&adev->physical_node_lock);
221 list_for_each_entry(pn, &adev->physical_node_list, node)
222 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
224 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
230 mutex_unlock(&adev->physical_node_lock);
234 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
237 struct acpi_device *device = NULL;
238 struct acpi_device_physical_node *pn;
239 bool second_pass = (bool)data;
240 acpi_status status = AE_OK;
242 if (acpi_bus_get_device(handle, &device))
245 if (device->handler && !device->handler->hotplug.enabled) {
246 *ret_p = &device->dev;
250 mutex_lock(&device->physical_node_lock);
252 list_for_each_entry(pn, &device->physical_node_list, node) {
256 /* Skip devices offlined by the first pass. */
260 pn->put_online = false;
262 ret = device_offline(pn->dev);
263 if (acpi_force_hot_remove)
267 pn->put_online = !ret;
277 mutex_unlock(&device->physical_node_lock);
282 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
285 struct acpi_device *device = NULL;
286 struct acpi_device_physical_node *pn;
288 if (acpi_bus_get_device(handle, &device))
291 mutex_lock(&device->physical_node_lock);
293 list_for_each_entry(pn, &device->physical_node_list, node)
294 if (pn->put_online) {
295 device_online(pn->dev);
296 pn->put_online = false;
299 mutex_unlock(&device->physical_node_lock);
304 static int acpi_scan_try_to_offline(struct acpi_device *device)
306 acpi_handle handle = device->handle;
307 struct device *errdev = NULL;
311 * Carry out two passes here and ignore errors in the first pass,
312 * because if the devices in question are memory blocks and
313 * CONFIG_MEMCG is set, one of the blocks may hold data structures
314 * that the other blocks depend on, but it is not known in advance which
317 * If the first pass is successful, the second one isn't needed, though.
319 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
320 NULL, acpi_bus_offline, (void *)false,
322 if (status == AE_SUPPORT) {
323 dev_warn(errdev, "Offline disabled.\n");
324 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
325 acpi_bus_online, NULL, NULL, NULL);
328 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
331 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
332 NULL, acpi_bus_offline, (void *)true,
334 if (!errdev || acpi_force_hot_remove)
335 acpi_bus_offline(handle, 0, (void *)true,
338 if (errdev && !acpi_force_hot_remove) {
339 dev_warn(errdev, "Offline failed.\n");
340 acpi_bus_online(handle, 0, NULL, NULL);
341 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
342 ACPI_UINT32_MAX, acpi_bus_online,
350 static int acpi_scan_hot_remove(struct acpi_device *device)
352 acpi_handle handle = device->handle;
353 unsigned long long sta;
356 if (device->handler && device->handler->hotplug.demand_offline
357 && !acpi_force_hot_remove) {
358 if (!acpi_scan_is_offline(device, true))
361 int error = acpi_scan_try_to_offline(device);
366 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
367 "Hot-removing device %s...\n", dev_name(&device->dev)));
369 acpi_bus_trim(device);
371 acpi_evaluate_lck(handle, 0);
375 status = acpi_evaluate_ej0(handle);
376 if (status == AE_NOT_FOUND)
378 else if (ACPI_FAILURE(status))
382 * Verify if eject was indeed successful. If not, log an error
383 * message. No need to call _OST since _EJ0 call was made OK.
385 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
386 if (ACPI_FAILURE(status)) {
387 acpi_handle_warn(handle,
388 "Status check after eject failed (0x%x)\n", status);
389 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
390 acpi_handle_warn(handle,
391 "Eject incomplete - status 0x%llx\n", sta);
397 static int acpi_scan_device_not_present(struct acpi_device *adev)
399 if (!acpi_device_enumerated(adev)) {
400 dev_warn(&adev->dev, "Still not present\n");
407 static int acpi_scan_device_check(struct acpi_device *adev)
411 acpi_bus_get_status(adev);
412 if (adev->status.present || adev->status.functional) {
414 * This function is only called for device objects for which
415 * matching scan handlers exist. The only situation in which
416 * the scan handler is not attached to this device object yet
417 * is when the device has just appeared (either it wasn't
418 * present at all before or it was removed and then added
422 dev_warn(&adev->dev, "Already enumerated\n");
425 error = acpi_bus_scan(adev->handle);
427 dev_warn(&adev->dev, "Namespace scan failure\n");
430 if (!adev->handler) {
431 dev_warn(&adev->dev, "Enumeration failure\n");
435 error = acpi_scan_device_not_present(adev);
440 static int acpi_scan_bus_check(struct acpi_device *adev)
442 struct acpi_scan_handler *handler = adev->handler;
443 struct acpi_device *child;
446 acpi_bus_get_status(adev);
447 if (!(adev->status.present || adev->status.functional)) {
448 acpi_scan_device_not_present(adev);
451 if (handler && handler->hotplug.scan_dependent)
452 return handler->hotplug.scan_dependent(adev);
454 error = acpi_bus_scan(adev->handle);
456 dev_warn(&adev->dev, "Namespace scan failure\n");
459 list_for_each_entry(child, &adev->children, node) {
460 error = acpi_scan_bus_check(child);
467 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
470 case ACPI_NOTIFY_BUS_CHECK:
471 return acpi_scan_bus_check(adev);
472 case ACPI_NOTIFY_DEVICE_CHECK:
473 return acpi_scan_device_check(adev);
474 case ACPI_NOTIFY_EJECT_REQUEST:
475 case ACPI_OST_EC_OSPM_EJECT:
476 if (adev->handler && !adev->handler->hotplug.enabled) {
477 dev_info(&adev->dev, "Eject disabled\n");
480 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
481 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
482 return acpi_scan_hot_remove(adev);
487 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
489 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
492 lock_device_hotplug();
493 mutex_lock(&acpi_scan_lock);
496 * The device object's ACPI handle cannot become invalid as long as we
497 * are holding acpi_scan_lock, but it might have become invalid before
498 * that lock was acquired.
500 if (adev->handle == INVALID_ACPI_HANDLE)
503 if (adev->flags.is_dock_station) {
504 error = dock_notify(adev, src);
505 } else if (adev->flags.hotplug_notify) {
506 error = acpi_generic_hotplug_event(adev, src);
507 if (error == -EPERM) {
508 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
512 int (*notify)(struct acpi_device *, u32);
514 acpi_lock_hp_context();
515 notify = adev->hp ? adev->hp->notify : NULL;
516 acpi_unlock_hp_context();
518 * There may be additional notify handlers for device objects
519 * without the .event() callback, so ignore them here.
522 error = notify(adev, src);
527 ost_code = ACPI_OST_SC_SUCCESS;
530 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
533 acpi_bus_put_acpi_device(adev);
534 mutex_unlock(&acpi_scan_lock);
535 unlock_device_hotplug();
538 static ssize_t real_power_state_show(struct device *dev,
539 struct device_attribute *attr, char *buf)
541 struct acpi_device *adev = to_acpi_device(dev);
545 ret = acpi_device_get_power(adev, &state);
549 return sprintf(buf, "%s\n", acpi_power_state_string(state));
552 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
554 static ssize_t power_state_show(struct device *dev,
555 struct device_attribute *attr, char *buf)
557 struct acpi_device *adev = to_acpi_device(dev);
559 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
562 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
565 acpi_eject_store(struct device *d, struct device_attribute *attr,
566 const char *buf, size_t count)
568 struct acpi_device *acpi_device = to_acpi_device(d);
569 acpi_object_type not_used;
572 if (!count || buf[0] != '1')
575 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
576 && !acpi_device->driver)
579 status = acpi_get_type(acpi_device->handle, ¬_used);
580 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
583 get_device(&acpi_device->dev);
584 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
585 if (ACPI_SUCCESS(status))
588 put_device(&acpi_device->dev);
589 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
590 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
591 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
594 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
597 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
598 struct acpi_device *acpi_dev = to_acpi_device(dev);
600 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
602 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
604 static ssize_t acpi_device_uid_show(struct device *dev,
605 struct device_attribute *attr, char *buf)
607 struct acpi_device *acpi_dev = to_acpi_device(dev);
609 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
611 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
613 static ssize_t acpi_device_adr_show(struct device *dev,
614 struct device_attribute *attr, char *buf)
616 struct acpi_device *acpi_dev = to_acpi_device(dev);
618 return sprintf(buf, "0x%08x\n",
619 (unsigned int)(acpi_dev->pnp.bus_address));
621 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
624 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
625 struct acpi_device *acpi_dev = to_acpi_device(dev);
626 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
629 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
633 result = sprintf(buf, "%s\n", (char*)path.pointer);
638 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
640 /* sysfs file that shows description text from the ACPI _STR method */
641 static ssize_t description_show(struct device *dev,
642 struct device_attribute *attr,
644 struct acpi_device *acpi_dev = to_acpi_device(dev);
647 if (acpi_dev->pnp.str_obj == NULL)
651 * The _STR object contains a Unicode identifier for a device.
652 * We need to convert to utf-8 so it can be displayed.
654 result = utf16s_to_utf8s(
655 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
656 acpi_dev->pnp.str_obj->buffer.length,
657 UTF16_LITTLE_ENDIAN, buf,
660 buf[result++] = '\n';
664 static DEVICE_ATTR(description, 0444, description_show, NULL);
667 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
669 struct acpi_device *acpi_dev = to_acpi_device(dev);
671 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
673 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
675 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
677 struct acpi_device *acpi_dev = to_acpi_device(dev);
679 unsigned long long sta;
681 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
682 if (ACPI_FAILURE(status))
685 return sprintf(buf, "%llu\n", sta);
687 static DEVICE_ATTR_RO(status);
689 static int acpi_device_setup_files(struct acpi_device *dev)
691 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
693 unsigned long long sun;
697 * Devices gotten from FADT don't have a "path" attribute
700 result = device_create_file(&dev->dev, &dev_attr_path);
705 if (!list_empty(&dev->pnp.ids)) {
706 result = device_create_file(&dev->dev, &dev_attr_hid);
710 result = device_create_file(&dev->dev, &dev_attr_modalias);
716 * If device has _STR, 'description' file is created
718 if (acpi_has_method(dev->handle, "_STR")) {
719 status = acpi_evaluate_object(dev->handle, "_STR",
721 if (ACPI_FAILURE(status))
722 buffer.pointer = NULL;
723 dev->pnp.str_obj = buffer.pointer;
724 result = device_create_file(&dev->dev, &dev_attr_description);
729 if (dev->pnp.type.bus_address)
730 result = device_create_file(&dev->dev, &dev_attr_adr);
731 if (dev->pnp.unique_id)
732 result = device_create_file(&dev->dev, &dev_attr_uid);
734 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
735 if (ACPI_SUCCESS(status)) {
736 dev->pnp.sun = (unsigned long)sun;
737 result = device_create_file(&dev->dev, &dev_attr_sun);
741 dev->pnp.sun = (unsigned long)-1;
744 if (acpi_has_method(dev->handle, "_STA")) {
745 result = device_create_file(&dev->dev, &dev_attr_status);
751 * If device has _EJ0, 'eject' file is created that is used to trigger
752 * hot-removal function from userland.
754 if (acpi_has_method(dev->handle, "_EJ0")) {
755 result = device_create_file(&dev->dev, &dev_attr_eject);
760 if (dev->flags.power_manageable) {
761 result = device_create_file(&dev->dev, &dev_attr_power_state);
765 if (dev->power.flags.power_resources)
766 result = device_create_file(&dev->dev,
767 &dev_attr_real_power_state);
774 static void acpi_device_remove_files(struct acpi_device *dev)
776 if (dev->flags.power_manageable) {
777 device_remove_file(&dev->dev, &dev_attr_power_state);
778 if (dev->power.flags.power_resources)
779 device_remove_file(&dev->dev,
780 &dev_attr_real_power_state);
784 * If device has _STR, remove 'description' file
786 if (acpi_has_method(dev->handle, "_STR")) {
787 kfree(dev->pnp.str_obj);
788 device_remove_file(&dev->dev, &dev_attr_description);
791 * If device has _EJ0, remove 'eject' file.
793 if (acpi_has_method(dev->handle, "_EJ0"))
794 device_remove_file(&dev->dev, &dev_attr_eject);
796 if (acpi_has_method(dev->handle, "_SUN"))
797 device_remove_file(&dev->dev, &dev_attr_sun);
799 if (dev->pnp.unique_id)
800 device_remove_file(&dev->dev, &dev_attr_uid);
801 if (dev->pnp.type.bus_address)
802 device_remove_file(&dev->dev, &dev_attr_adr);
803 device_remove_file(&dev->dev, &dev_attr_modalias);
804 device_remove_file(&dev->dev, &dev_attr_hid);
805 if (acpi_has_method(dev->handle, "_STA"))
806 device_remove_file(&dev->dev, &dev_attr_status);
808 device_remove_file(&dev->dev, &dev_attr_path);
810 /* --------------------------------------------------------------------------
812 -------------------------------------------------------------------------- */
814 static const struct acpi_device_id *__acpi_match_device(
815 struct acpi_device *device, const struct acpi_device_id *ids)
817 const struct acpi_device_id *id;
818 struct acpi_hardware_id *hwid;
821 * If the device is not present, it is unnecessary to load device
824 if (!device->status.present)
827 for (id = ids; id->id[0]; id++)
828 list_for_each_entry(hwid, &device->pnp.ids, list)
829 if (!strcmp((char *) id->id, hwid->id))
836 * acpi_match_device - Match a struct device against a given list of ACPI IDs
837 * @ids: Array of struct acpi_device_id object to match against.
838 * @dev: The device structure to match.
840 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
841 * object for that handle and use that object to match against a given list of
844 * Return a pointer to the first matching ID on success or %NULL on failure.
846 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
847 const struct device *dev)
849 struct acpi_device *adev;
850 acpi_handle handle = ACPI_HANDLE(dev);
852 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
855 return __acpi_match_device(adev, ids);
857 EXPORT_SYMBOL_GPL(acpi_match_device);
859 int acpi_match_device_ids(struct acpi_device *device,
860 const struct acpi_device_id *ids)
862 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
864 EXPORT_SYMBOL(acpi_match_device_ids);
866 static void acpi_free_power_resources_lists(struct acpi_device *device)
870 if (device->wakeup.flags.valid)
871 acpi_power_resources_list_free(&device->wakeup.resources);
873 if (!device->flags.power_manageable)
876 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
877 struct acpi_device_power_state *ps = &device->power.states[i];
878 acpi_power_resources_list_free(&ps->resources);
882 static void acpi_device_release(struct device *dev)
884 struct acpi_device *acpi_dev = to_acpi_device(dev);
886 acpi_free_pnp_ids(&acpi_dev->pnp);
887 acpi_free_power_resources_lists(acpi_dev);
891 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
893 struct acpi_device *acpi_dev = to_acpi_device(dev);
894 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
896 return acpi_dev->flags.match_driver
897 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
900 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
902 struct acpi_device *acpi_dev = to_acpi_device(dev);
905 if (list_empty(&acpi_dev->pnp.ids))
908 if (add_uevent_var(env, "MODALIAS="))
910 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
911 sizeof(env->buf) - env->buflen);
918 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
920 struct acpi_device *device = data;
922 device->driver->ops.notify(device, event);
925 static void acpi_device_notify_fixed(void *data)
927 struct acpi_device *device = data;
929 /* Fixed hardware devices have no handles */
930 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
933 static acpi_status acpi_device_fixed_event(void *data)
935 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
939 static int acpi_device_install_notify_handler(struct acpi_device *device)
943 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
945 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
946 acpi_device_fixed_event,
948 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
950 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
951 acpi_device_fixed_event,
954 status = acpi_install_notify_handler(device->handle,
959 if (ACPI_FAILURE(status))
964 static void acpi_device_remove_notify_handler(struct acpi_device *device)
966 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
967 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
968 acpi_device_fixed_event);
969 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
970 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
971 acpi_device_fixed_event);
973 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
977 static int acpi_device_probe(struct device *dev)
979 struct acpi_device *acpi_dev = to_acpi_device(dev);
980 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
983 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
986 if (!acpi_drv->ops.add)
989 ret = acpi_drv->ops.add(acpi_dev);
993 acpi_dev->driver = acpi_drv;
994 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
995 "Driver [%s] successfully bound to device [%s]\n",
996 acpi_drv->name, acpi_dev->pnp.bus_id));
998 if (acpi_drv->ops.notify) {
999 ret = acpi_device_install_notify_handler(acpi_dev);
1001 if (acpi_drv->ops.remove)
1002 acpi_drv->ops.remove(acpi_dev);
1004 acpi_dev->driver = NULL;
1005 acpi_dev->driver_data = NULL;
1010 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1011 acpi_drv->name, acpi_dev->pnp.bus_id));
1016 static int acpi_device_remove(struct device * dev)
1018 struct acpi_device *acpi_dev = to_acpi_device(dev);
1019 struct acpi_driver *acpi_drv = acpi_dev->driver;
1022 if (acpi_drv->ops.notify)
1023 acpi_device_remove_notify_handler(acpi_dev);
1024 if (acpi_drv->ops.remove)
1025 acpi_drv->ops.remove(acpi_dev);
1027 acpi_dev->driver = NULL;
1028 acpi_dev->driver_data = NULL;
1034 struct bus_type acpi_bus_type = {
1036 .match = acpi_bus_match,
1037 .probe = acpi_device_probe,
1038 .remove = acpi_device_remove,
1039 .uevent = acpi_device_uevent,
1042 static void acpi_device_del(struct acpi_device *device)
1044 mutex_lock(&acpi_device_lock);
1046 list_del(&device->node);
1048 list_del(&device->wakeup_list);
1049 mutex_unlock(&acpi_device_lock);
1051 acpi_power_add_remove_device(device, false);
1052 acpi_device_remove_files(device);
1054 device->remove(device);
1056 device_del(&device->dev);
1059 static LIST_HEAD(acpi_device_del_list);
1060 static DEFINE_MUTEX(acpi_device_del_lock);
1062 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1065 struct acpi_device *adev;
1067 mutex_lock(&acpi_device_del_lock);
1069 if (list_empty(&acpi_device_del_list)) {
1070 mutex_unlock(&acpi_device_del_lock);
1073 adev = list_first_entry(&acpi_device_del_list,
1074 struct acpi_device, del_list);
1075 list_del(&adev->del_list);
1077 mutex_unlock(&acpi_device_del_lock);
1079 acpi_device_del(adev);
1081 * Drop references to all power resources that might have been
1082 * used by the device.
1084 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1085 put_device(&adev->dev);
1090 * acpi_scan_drop_device - Drop an ACPI device object.
1091 * @handle: Handle of an ACPI namespace node, not used.
1092 * @context: Address of the ACPI device object to drop.
1094 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1095 * namespace node the device object pointed to by @context is attached to.
1097 * The unregistration is carried out asynchronously to avoid running
1098 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1099 * ensure the correct ordering (the device objects must be unregistered in the
1100 * same order in which the corresponding namespace nodes are deleted).
1102 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1104 static DECLARE_WORK(work, acpi_device_del_work_fn);
1105 struct acpi_device *adev = context;
1107 mutex_lock(&acpi_device_del_lock);
1110 * Use the ACPI hotplug workqueue which is ordered, so this work item
1111 * won't run after any hotplug work items submitted subsequently. That
1112 * prevents attempts to register device objects identical to those being
1113 * deleted from happening concurrently (such attempts result from
1114 * hotplug events handled via the ACPI hotplug workqueue). It also will
1115 * run after all of the work items submitted previosuly, which helps
1116 * those work items to ensure that they are not accessing stale device
1119 if (list_empty(&acpi_device_del_list))
1120 acpi_queue_hotplug_work(&work);
1122 list_add_tail(&adev->del_list, &acpi_device_del_list);
1123 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1124 adev->handle = INVALID_ACPI_HANDLE;
1126 mutex_unlock(&acpi_device_del_lock);
1129 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1130 void (*callback)(void *))
1137 status = acpi_get_data_full(handle, acpi_scan_drop_device,
1138 (void **)device, callback);
1139 if (ACPI_FAILURE(status) || !*device) {
1140 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1147 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1149 return acpi_get_device_data(handle, device, NULL);
1151 EXPORT_SYMBOL(acpi_bus_get_device);
1153 static void get_acpi_device(void *dev)
1156 get_device(&((struct acpi_device *)dev)->dev);
1159 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1161 struct acpi_device *adev = NULL;
1163 acpi_get_device_data(handle, &adev, get_acpi_device);
1167 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1169 put_device(&adev->dev);
1172 int acpi_device_add(struct acpi_device *device,
1173 void (*release)(struct device *))
1176 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1179 if (device->handle) {
1182 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1184 if (ACPI_FAILURE(status)) {
1185 acpi_handle_err(device->handle,
1186 "Unable to attach device data\n");
1194 * Link this device to its parent and siblings.
1196 INIT_LIST_HEAD(&device->children);
1197 INIT_LIST_HEAD(&device->node);
1198 INIT_LIST_HEAD(&device->wakeup_list);
1199 INIT_LIST_HEAD(&device->physical_node_list);
1200 INIT_LIST_HEAD(&device->del_list);
1201 mutex_init(&device->physical_node_lock);
1203 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1205 pr_err(PREFIX "Memory allocation error\n");
1210 mutex_lock(&acpi_device_lock);
1212 * Find suitable bus_id and instance number in acpi_bus_id_list
1213 * If failed, create one and link it into acpi_bus_id_list
1215 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1216 if (!strcmp(acpi_device_bus_id->bus_id,
1217 acpi_device_hid(device))) {
1218 acpi_device_bus_id->instance_no++;
1225 acpi_device_bus_id = new_bus_id;
1226 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1227 acpi_device_bus_id->instance_no = 0;
1228 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1230 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1233 list_add_tail(&device->node, &device->parent->children);
1235 if (device->wakeup.flags.valid)
1236 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1237 mutex_unlock(&acpi_device_lock);
1240 device->dev.parent = &device->parent->dev;
1241 device->dev.bus = &acpi_bus_type;
1242 device->dev.release = release;
1243 result = device_add(&device->dev);
1245 dev_err(&device->dev, "Error registering device\n");
1249 result = acpi_device_setup_files(device);
1251 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1252 dev_name(&device->dev));
1257 mutex_lock(&acpi_device_lock);
1259 list_del(&device->node);
1260 list_del(&device->wakeup_list);
1261 mutex_unlock(&acpi_device_lock);
1264 acpi_detach_data(device->handle, acpi_scan_drop_device);
1268 /* --------------------------------------------------------------------------
1270 -------------------------------------------------------------------------- */
1272 * acpi_bus_register_driver - register a driver with the ACPI bus
1273 * @driver: driver being registered
1275 * Registers a driver with the ACPI bus. Searches the namespace for all
1276 * devices that match the driver's criteria and binds. Returns zero for
1277 * success or a negative error status for failure.
1279 int acpi_bus_register_driver(struct acpi_driver *driver)
1285 driver->drv.name = driver->name;
1286 driver->drv.bus = &acpi_bus_type;
1287 driver->drv.owner = driver->owner;
1289 ret = driver_register(&driver->drv);
1293 EXPORT_SYMBOL(acpi_bus_register_driver);
1296 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1297 * @driver: driver to unregister
1299 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1300 * devices that match the driver's criteria and unbinds.
1302 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1304 driver_unregister(&driver->drv);
1307 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1309 /* --------------------------------------------------------------------------
1311 -------------------------------------------------------------------------- */
1312 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1314 struct acpi_device *device = NULL;
1318 * Fixed hardware devices do not appear in the namespace and do not
1319 * have handles, but we fabricate acpi_devices for them, so we have
1320 * to deal with them specially.
1326 status = acpi_get_parent(handle, &handle);
1327 if (ACPI_FAILURE(status))
1328 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1329 } while (acpi_bus_get_device(handle, &device));
1334 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1338 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1339 union acpi_object *obj;
1341 status = acpi_get_handle(handle, "_EJD", &tmp);
1342 if (ACPI_FAILURE(status))
1345 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1346 if (ACPI_SUCCESS(status)) {
1347 obj = buffer.pointer;
1348 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1350 kfree(buffer.pointer);
1354 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1356 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1357 struct acpi_device_wakeup *wakeup)
1359 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1360 union acpi_object *package = NULL;
1361 union acpi_object *element = NULL;
1368 INIT_LIST_HEAD(&wakeup->resources);
1371 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1372 if (ACPI_FAILURE(status)) {
1373 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1377 package = (union acpi_object *)buffer.pointer;
1379 if (!package || package->package.count < 2)
1382 element = &(package->package.elements[0]);
1386 if (element->type == ACPI_TYPE_PACKAGE) {
1387 if ((element->package.count < 2) ||
1388 (element->package.elements[0].type !=
1389 ACPI_TYPE_LOCAL_REFERENCE)
1390 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1393 wakeup->gpe_device =
1394 element->package.elements[0].reference.handle;
1395 wakeup->gpe_number =
1396 (u32) element->package.elements[1].integer.value;
1397 } else if (element->type == ACPI_TYPE_INTEGER) {
1398 wakeup->gpe_device = NULL;
1399 wakeup->gpe_number = element->integer.value;
1404 element = &(package->package.elements[1]);
1405 if (element->type != ACPI_TYPE_INTEGER)
1408 wakeup->sleep_state = element->integer.value;
1410 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1414 if (!list_empty(&wakeup->resources)) {
1417 err = acpi_power_wakeup_list_init(&wakeup->resources,
1420 acpi_handle_warn(handle, "Retrieving current states "
1421 "of wakeup power resources failed\n");
1422 acpi_power_resources_list_free(&wakeup->resources);
1425 if (sleep_state < wakeup->sleep_state) {
1426 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1427 "(S%d) by S%d from power resources\n",
1428 (int)wakeup->sleep_state, sleep_state);
1429 wakeup->sleep_state = sleep_state;
1434 kfree(buffer.pointer);
1438 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1440 struct acpi_device_id button_device_ids[] = {
1446 struct acpi_device_wakeup *wakeup = &device->wakeup;
1448 acpi_event_status event_status;
1450 wakeup->flags.notifier_present = 0;
1452 /* Power button, Lid switch always enable wakeup */
1453 if (!acpi_match_device_ids(device, button_device_ids)) {
1454 wakeup->flags.run_wake = 1;
1455 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1456 /* Do not use Lid/sleep button for S5 wakeup */
1457 if (wakeup->sleep_state == ACPI_STATE_S5)
1458 wakeup->sleep_state = ACPI_STATE_S4;
1460 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1461 device_set_wakeup_capable(&device->dev, true);
1465 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1466 wakeup->gpe_number);
1467 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1469 if (ACPI_FAILURE(status))
1472 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1475 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1479 /* Presence of _PRW indicates wake capable */
1480 if (!acpi_has_method(device->handle, "_PRW"))
1483 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1486 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1490 device->wakeup.flags.valid = 1;
1491 device->wakeup.prepare_count = 0;
1492 acpi_wakeup_gpe_init(device);
1493 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1494 * system for the ACPI device with the _PRW object.
1495 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1496 * So it is necessary to call _DSW object first. Only when it is not
1497 * present will the _PSW object used.
1499 err = acpi_device_sleep_wake(device, 0, 0, 0);
1501 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1502 "error in _DSW or _PSW evaluation\n"));
1505 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1507 struct acpi_device_power_state *ps = &device->power.states[state];
1508 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1509 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1512 INIT_LIST_HEAD(&ps->resources);
1514 /* Evaluate "_PRx" to get referenced power resources */
1515 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1516 if (ACPI_SUCCESS(status)) {
1517 union acpi_object *package = buffer.pointer;
1519 if (buffer.length && package
1520 && package->type == ACPI_TYPE_PACKAGE
1521 && package->package.count) {
1522 int err = acpi_extract_power_resources(package, 0,
1525 device->power.flags.power_resources = 1;
1527 ACPI_FREE(buffer.pointer);
1530 /* Evaluate "_PSx" to see if we can do explicit sets */
1532 if (acpi_has_method(device->handle, pathname))
1533 ps->flags.explicit_set = 1;
1536 * State is valid if there are means to put the device into it.
1537 * D3hot is only valid if _PR3 present.
1539 if (!list_empty(&ps->resources)
1540 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1541 ps->flags.valid = 1;
1542 ps->flags.os_accessible = 1;
1545 ps->power = -1; /* Unknown - driver assigned */
1546 ps->latency = -1; /* Unknown - driver assigned */
1549 static void acpi_bus_get_power_flags(struct acpi_device *device)
1553 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1554 if (!acpi_has_method(device->handle, "_PS0") &&
1555 !acpi_has_method(device->handle, "_PR0"))
1558 device->flags.power_manageable = 1;
1561 * Power Management Flags
1563 if (acpi_has_method(device->handle, "_PSC"))
1564 device->power.flags.explicit_get = 1;
1566 if (acpi_has_method(device->handle, "_IRC"))
1567 device->power.flags.inrush_current = 1;
1569 if (acpi_has_method(device->handle, "_DSW"))
1570 device->power.flags.dsw_present = 1;
1573 * Enumerate supported power management states
1575 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1576 acpi_bus_init_power_state(device, i);
1578 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1580 /* Set defaults for D0 and D3 states (always valid) */
1581 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1582 device->power.states[ACPI_STATE_D0].power = 100;
1583 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1584 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1586 /* Set D3cold's explicit_set flag if _PS3 exists. */
1587 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1588 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1590 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1591 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1592 device->power.flags.power_resources)
1593 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1595 if (acpi_bus_init_power(device)) {
1596 acpi_free_power_resources_lists(device);
1597 device->flags.power_manageable = 0;
1601 static void acpi_bus_get_flags(struct acpi_device *device)
1603 /* Presence of _STA indicates 'dynamic_status' */
1604 if (acpi_has_method(device->handle, "_STA"))
1605 device->flags.dynamic_status = 1;
1607 /* Presence of _RMV indicates 'removable' */
1608 if (acpi_has_method(device->handle, "_RMV"))
1609 device->flags.removable = 1;
1611 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1612 if (acpi_has_method(device->handle, "_EJD") ||
1613 acpi_has_method(device->handle, "_EJ0"))
1614 device->flags.ejectable = 1;
1617 static void acpi_device_get_busid(struct acpi_device *device)
1619 char bus_id[5] = { '?', 0 };
1620 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1626 * The device's Bus ID is simply the object name.
1627 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1629 if (ACPI_IS_ROOT_DEVICE(device)) {
1630 strcpy(device->pnp.bus_id, "ACPI");
1634 switch (device->device_type) {
1635 case ACPI_BUS_TYPE_POWER_BUTTON:
1636 strcpy(device->pnp.bus_id, "PWRF");
1638 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1639 strcpy(device->pnp.bus_id, "SLPF");
1642 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1643 /* Clean up trailing underscores (if any) */
1644 for (i = 3; i > 1; i--) {
1645 if (bus_id[i] == '_')
1650 strcpy(device->pnp.bus_id, bus_id);
1656 * acpi_ata_match - see if an acpi object is an ATA device
1658 * If an acpi object has one of the ACPI ATA methods defined,
1659 * then we can safely call it an ATA device.
1661 bool acpi_ata_match(acpi_handle handle)
1663 return acpi_has_method(handle, "_GTF") ||
1664 acpi_has_method(handle, "_GTM") ||
1665 acpi_has_method(handle, "_STM") ||
1666 acpi_has_method(handle, "_SDD");
1670 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1672 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1673 * then we can safely call it an ejectable drive bay
1675 bool acpi_bay_match(acpi_handle handle)
1677 acpi_handle phandle;
1679 if (!acpi_has_method(handle, "_EJ0"))
1681 if (acpi_ata_match(handle))
1683 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1686 return acpi_ata_match(phandle);
1689 bool acpi_device_is_battery(struct acpi_device *adev)
1691 struct acpi_hardware_id *hwid;
1693 list_for_each_entry(hwid, &adev->pnp.ids, list)
1694 if (!strcmp("PNP0C0A", hwid->id))
1700 static bool is_ejectable_bay(struct acpi_device *adev)
1702 acpi_handle handle = adev->handle;
1704 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1707 return acpi_bay_match(handle);
1711 * acpi_dock_match - see if an acpi object has a _DCK method
1713 bool acpi_dock_match(acpi_handle handle)
1715 return acpi_has_method(handle, "_DCK");
1718 const char *acpi_device_hid(struct acpi_device *device)
1720 struct acpi_hardware_id *hid;
1722 if (list_empty(&device->pnp.ids))
1725 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1728 EXPORT_SYMBOL(acpi_device_hid);
1730 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1732 struct acpi_hardware_id *id;
1734 id = kmalloc(sizeof(*id), GFP_KERNEL);
1738 id->id = kstrdup(dev_id, GFP_KERNEL);
1744 list_add_tail(&id->list, &pnp->ids);
1745 pnp->type.hardware_id = 1;
1749 * Old IBM workstations have a DSDT bug wherein the SMBus object
1750 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1751 * prefix. Work around this.
1753 static bool acpi_ibm_smbus_match(acpi_handle handle)
1755 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1756 struct acpi_buffer path = { sizeof(node_name), node_name };
1758 if (!dmi_name_in_vendors("IBM"))
1761 /* Look for SMBS object */
1762 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1763 strcmp("SMBS", path.pointer))
1766 /* Does it have the necessary (but misnamed) methods? */
1767 if (acpi_has_method(handle, "SBI") &&
1768 acpi_has_method(handle, "SBR") &&
1769 acpi_has_method(handle, "SBW"))
1775 static bool acpi_object_is_system_bus(acpi_handle handle)
1779 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1782 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1789 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1793 struct acpi_device_info *info;
1794 struct acpi_pnp_device_id_list *cid_list;
1797 switch (device_type) {
1798 case ACPI_BUS_TYPE_DEVICE:
1799 if (handle == ACPI_ROOT_OBJECT) {
1800 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1804 status = acpi_get_object_info(handle, &info);
1805 if (ACPI_FAILURE(status)) {
1806 pr_err(PREFIX "%s: Error reading device info\n",
1811 if (info->valid & ACPI_VALID_HID) {
1812 acpi_add_id(pnp, info->hardware_id.string);
1813 pnp->type.platform_id = 1;
1815 if (info->valid & ACPI_VALID_CID) {
1816 cid_list = &info->compatible_id_list;
1817 for (i = 0; i < cid_list->count; i++)
1818 acpi_add_id(pnp, cid_list->ids[i].string);
1820 if (info->valid & ACPI_VALID_ADR) {
1821 pnp->bus_address = info->address;
1822 pnp->type.bus_address = 1;
1824 if (info->valid & ACPI_VALID_UID)
1825 pnp->unique_id = kstrdup(info->unique_id.string,
1831 * Some devices don't reliably have _HIDs & _CIDs, so add
1832 * synthetic HIDs to make sure drivers can find them.
1834 if (acpi_is_video_device(handle))
1835 acpi_add_id(pnp, ACPI_VIDEO_HID);
1836 else if (acpi_bay_match(handle))
1837 acpi_add_id(pnp, ACPI_BAY_HID);
1838 else if (acpi_dock_match(handle))
1839 acpi_add_id(pnp, ACPI_DOCK_HID);
1840 else if (acpi_ibm_smbus_match(handle))
1841 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1842 else if (list_empty(&pnp->ids) &&
1843 acpi_object_is_system_bus(handle)) {
1844 /* \_SB, \_TZ, LNXSYBUS */
1845 acpi_add_id(pnp, ACPI_BUS_HID);
1846 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1847 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1851 case ACPI_BUS_TYPE_POWER:
1852 acpi_add_id(pnp, ACPI_POWER_HID);
1854 case ACPI_BUS_TYPE_PROCESSOR:
1855 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1857 case ACPI_BUS_TYPE_THERMAL:
1858 acpi_add_id(pnp, ACPI_THERMAL_HID);
1860 case ACPI_BUS_TYPE_POWER_BUTTON:
1861 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1863 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1864 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1869 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1871 struct acpi_hardware_id *id, *tmp;
1873 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1877 kfree(pnp->unique_id);
1880 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1881 int type, unsigned long long sta)
1883 INIT_LIST_HEAD(&device->pnp.ids);
1884 device->device_type = type;
1885 device->handle = handle;
1886 device->parent = acpi_bus_get_parent(handle);
1887 acpi_set_device_status(device, sta);
1888 acpi_device_get_busid(device);
1889 acpi_set_pnp_ids(handle, &device->pnp, type);
1890 acpi_bus_get_flags(device);
1891 device->flags.match_driver = false;
1892 device->flags.initialized = true;
1893 device->flags.visited = false;
1894 device_initialize(&device->dev);
1895 dev_set_uevent_suppress(&device->dev, true);
1898 void acpi_device_add_finalize(struct acpi_device *device)
1900 dev_set_uevent_suppress(&device->dev, false);
1901 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1904 static int acpi_add_single_object(struct acpi_device **child,
1905 acpi_handle handle, int type,
1906 unsigned long long sta)
1909 struct acpi_device *device;
1910 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1912 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1914 printk(KERN_ERR PREFIX "Memory allocation error\n");
1918 acpi_init_device_object(device, handle, type, sta);
1919 acpi_bus_get_power_flags(device);
1920 acpi_bus_get_wakeup_device_flags(device);
1922 result = acpi_device_add(device, acpi_device_release);
1924 acpi_device_release(&device->dev);
1928 acpi_power_add_remove_device(device, true);
1929 acpi_device_add_finalize(device);
1930 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1931 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1932 dev_name(&device->dev), (char *) buffer.pointer,
1933 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1934 kfree(buffer.pointer);
1939 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1940 unsigned long long *sta)
1943 acpi_object_type acpi_type;
1945 status = acpi_get_type(handle, &acpi_type);
1946 if (ACPI_FAILURE(status))
1949 switch (acpi_type) {
1950 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1951 case ACPI_TYPE_DEVICE:
1952 *type = ACPI_BUS_TYPE_DEVICE;
1953 status = acpi_bus_get_status_handle(handle, sta);
1954 if (ACPI_FAILURE(status))
1957 case ACPI_TYPE_PROCESSOR:
1958 *type = ACPI_BUS_TYPE_PROCESSOR;
1959 status = acpi_bus_get_status_handle(handle, sta);
1960 if (ACPI_FAILURE(status))
1963 case ACPI_TYPE_THERMAL:
1964 *type = ACPI_BUS_TYPE_THERMAL;
1965 *sta = ACPI_STA_DEFAULT;
1967 case ACPI_TYPE_POWER:
1968 *type = ACPI_BUS_TYPE_POWER;
1969 *sta = ACPI_STA_DEFAULT;
1978 bool acpi_device_is_present(struct acpi_device *adev)
1980 if (adev->status.present || adev->status.functional)
1983 adev->flags.initialized = false;
1987 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1989 const struct acpi_device_id **matchid)
1991 const struct acpi_device_id *devid;
1994 return handler->match(idstr, matchid);
1996 for (devid = handler->ids; devid->id[0]; devid++)
1997 if (!strcmp((char *)devid->id, idstr)) {
2007 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2008 const struct acpi_device_id **matchid)
2010 struct acpi_scan_handler *handler;
2012 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2013 if (acpi_scan_handler_matching(handler, idstr, matchid))
2019 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2021 if (!!hotplug->enabled == !!val)
2024 mutex_lock(&acpi_scan_lock);
2026 hotplug->enabled = val;
2028 mutex_unlock(&acpi_scan_lock);
2031 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2033 struct acpi_hardware_id *hwid;
2035 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2036 acpi_dock_add(adev);
2039 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2040 struct acpi_scan_handler *handler;
2042 handler = acpi_scan_match_handler(hwid->id, NULL);
2044 adev->flags.hotplug_notify = true;
2050 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2051 void *not_used, void **return_value)
2053 struct acpi_device *device = NULL;
2055 unsigned long long sta;
2058 acpi_bus_get_device(handle, &device);
2062 result = acpi_bus_type_and_status(handle, &type, &sta);
2066 if (type == ACPI_BUS_TYPE_POWER) {
2067 acpi_add_power_resource(handle);
2071 acpi_add_single_object(&device, handle, type, sta);
2073 return AE_CTRL_DEPTH;
2075 acpi_scan_init_hotplug(device);
2079 *return_value = device;
2084 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2086 bool *is_spi_i2c_slave_p = data;
2088 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2092 * devices that are connected to UART still need to be enumerated to
2095 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2096 *is_spi_i2c_slave_p = true;
2098 /* no need to do more checking */
2102 static void acpi_default_enumeration(struct acpi_device *device)
2104 struct list_head resource_list;
2105 bool is_spi_i2c_slave = false;
2107 if (!device->pnp.type.platform_id || device->handler)
2111 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2112 * respective parents.
2114 INIT_LIST_HEAD(&resource_list);
2115 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2117 acpi_dev_free_resource_list(&resource_list);
2118 if (!is_spi_i2c_slave)
2119 acpi_create_platform_device(device);
2122 static int acpi_scan_attach_handler(struct acpi_device *device)
2124 struct acpi_hardware_id *hwid;
2127 list_for_each_entry(hwid, &device->pnp.ids, list) {
2128 const struct acpi_device_id *devid;
2129 struct acpi_scan_handler *handler;
2131 handler = acpi_scan_match_handler(hwid->id, &devid);
2133 if (!handler->attach) {
2134 device->pnp.type.platform_id = 0;
2137 device->handler = handler;
2138 ret = handler->attach(device, devid);
2142 device->handler = NULL;
2148 acpi_default_enumeration(device);
2153 static void acpi_bus_attach(struct acpi_device *device)
2155 struct acpi_device *child;
2159 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2160 register_dock_dependent_device(device, ejd);
2162 acpi_bus_get_status(device);
2163 /* Skip devices that are not present. */
2164 if (!acpi_device_is_present(device)) {
2165 device->flags.visited = false;
2168 if (device->handler)
2171 if (!device->flags.initialized) {
2172 acpi_bus_update_power(device, NULL);
2173 device->flags.initialized = true;
2175 device->flags.visited = false;
2176 ret = acpi_scan_attach_handler(device);
2180 device->flags.match_driver = true;
2182 ret = device_attach(&device->dev);
2186 device->flags.visited = true;
2189 list_for_each_entry(child, &device->children, node)
2190 acpi_bus_attach(child);
2194 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2195 * @handle: Root of the namespace scope to scan.
2197 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2200 * If no devices were found, -ENODEV is returned, but it does not mean that
2201 * there has been a real error. There just have been no suitable ACPI objects
2202 * in the table trunk from which the kernel could create a device and add an
2203 * appropriate driver.
2205 * Must be called under acpi_scan_lock.
2207 int acpi_bus_scan(acpi_handle handle)
2209 void *device = NULL;
2211 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2212 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2213 acpi_bus_check_add, NULL, NULL, &device);
2216 acpi_bus_attach(device);
2221 EXPORT_SYMBOL(acpi_bus_scan);
2224 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2225 * @adev: Root of the ACPI namespace scope to walk.
2227 * Must be called under acpi_scan_lock.
2229 void acpi_bus_trim(struct acpi_device *adev)
2231 struct acpi_scan_handler *handler = adev->handler;
2232 struct acpi_device *child;
2234 list_for_each_entry_reverse(child, &adev->children, node)
2235 acpi_bus_trim(child);
2237 adev->flags.match_driver = false;
2239 if (handler->detach)
2240 handler->detach(adev);
2242 adev->handler = NULL;
2244 device_release_driver(&adev->dev);
2247 * Most likely, the device is going away, so put it into D3cold before
2250 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2251 adev->flags.initialized = false;
2252 adev->flags.visited = false;
2254 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2256 static int acpi_bus_scan_fixed(void)
2261 * Enumerate all fixed-feature devices.
2263 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2264 struct acpi_device *device = NULL;
2266 result = acpi_add_single_object(&device, NULL,
2267 ACPI_BUS_TYPE_POWER_BUTTON,
2272 device->flags.match_driver = true;
2273 result = device_attach(&device->dev);
2277 device_init_wakeup(&device->dev, true);
2280 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2281 struct acpi_device *device = NULL;
2283 result = acpi_add_single_object(&device, NULL,
2284 ACPI_BUS_TYPE_SLEEP_BUTTON,
2289 device->flags.match_driver = true;
2290 result = device_attach(&device->dev);
2293 return result < 0 ? result : 0;
2296 int __init acpi_scan_init(void)
2300 result = bus_register(&acpi_bus_type);
2302 /* We don't want to quit even if we failed to add suspend/resume */
2303 printk(KERN_ERR PREFIX "Could not register bus type\n");
2306 acpi_pci_root_init();
2307 acpi_pci_link_init();
2308 acpi_processor_init();
2310 acpi_cmos_rtc_init();
2311 acpi_container_init();
2312 acpi_memory_hotplug_init();
2315 mutex_lock(&acpi_scan_lock);
2317 * Enumerate devices in the ACPI namespace.
2319 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2323 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2327 /* Fixed feature devices do not exist on HW-reduced platform */
2328 if (!acpi_gbl_reduced_hardware) {
2329 result = acpi_bus_scan_fixed();
2331 acpi_detach_data(acpi_root->handle,
2332 acpi_scan_drop_device);
2333 acpi_device_del(acpi_root);
2334 put_device(&acpi_root->dev);
2339 acpi_update_all_gpes();
2342 mutex_unlock(&acpi_scan_lock);