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->hotplug.demand_offline && !acpi_force_hot_remove) {
357 if (!acpi_scan_is_offline(device, true))
360 int error = acpi_scan_try_to_offline(device);
365 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
366 "Hot-removing device %s...\n", dev_name(&device->dev)));
368 acpi_bus_trim(device);
370 acpi_evaluate_lck(handle, 0);
374 status = acpi_evaluate_ej0(handle);
375 if (status == AE_NOT_FOUND)
377 else if (ACPI_FAILURE(status))
381 * Verify if eject was indeed successful. If not, log an error
382 * message. No need to call _OST since _EJ0 call was made OK.
384 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
385 if (ACPI_FAILURE(status)) {
386 acpi_handle_warn(handle,
387 "Status check after eject failed (0x%x)\n", status);
388 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
389 acpi_handle_warn(handle,
390 "Eject incomplete - status 0x%llx\n", sta);
396 static int acpi_scan_device_not_present(struct acpi_device *adev)
398 if (!acpi_device_enumerated(adev)) {
399 dev_warn(&adev->dev, "Still not present\n");
406 static int acpi_scan_device_check(struct acpi_device *adev)
410 acpi_bus_get_status(adev);
411 if (adev->status.present || adev->status.functional) {
413 * This function is only called for device objects for which
414 * matching scan handlers exist. The only situation in which
415 * the scan handler is not attached to this device object yet
416 * is when the device has just appeared (either it wasn't
417 * present at all before or it was removed and then added
421 dev_warn(&adev->dev, "Already enumerated\n");
424 error = acpi_bus_scan(adev->handle);
426 dev_warn(&adev->dev, "Namespace scan failure\n");
429 if (!adev->handler) {
430 dev_warn(&adev->dev, "Enumeration failure\n");
434 error = acpi_scan_device_not_present(adev);
439 static int acpi_scan_bus_check(struct acpi_device *adev)
441 struct acpi_scan_handler *handler = adev->handler;
442 struct acpi_device *child;
445 acpi_bus_get_status(adev);
446 if (!(adev->status.present || adev->status.functional)) {
447 acpi_scan_device_not_present(adev);
450 if (handler && handler->hotplug.scan_dependent)
451 return handler->hotplug.scan_dependent(adev);
453 error = acpi_bus_scan(adev->handle);
455 dev_warn(&adev->dev, "Namespace scan failure\n");
458 list_for_each_entry(child, &adev->children, node) {
459 error = acpi_scan_bus_check(child);
466 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
469 case ACPI_NOTIFY_BUS_CHECK:
470 return acpi_scan_bus_check(adev);
471 case ACPI_NOTIFY_DEVICE_CHECK:
472 return acpi_scan_device_check(adev);
473 case ACPI_NOTIFY_EJECT_REQUEST:
474 case ACPI_OST_EC_OSPM_EJECT:
475 if (adev->handler && !adev->handler->hotplug.enabled) {
476 dev_info(&adev->dev, "Eject disabled\n");
479 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
480 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
481 return acpi_scan_hot_remove(adev);
486 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
488 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
491 lock_device_hotplug();
492 mutex_lock(&acpi_scan_lock);
495 * The device object's ACPI handle cannot become invalid as long as we
496 * are holding acpi_scan_lock, but it might have become invalid before
497 * that lock was acquired.
499 if (adev->handle == INVALID_ACPI_HANDLE)
502 if (adev->flags.is_dock_station) {
503 error = dock_notify(adev, src);
504 } else if (adev->flags.hotplug_notify) {
505 error = acpi_generic_hotplug_event(adev, src);
506 if (error == -EPERM) {
507 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
511 int (*notify)(struct acpi_device *, u32);
513 acpi_lock_hp_context();
514 notify = adev->hp ? adev->hp->notify : NULL;
515 acpi_unlock_hp_context();
517 * There may be additional notify handlers for device objects
518 * without the .event() callback, so ignore them here.
521 error = notify(adev, src);
526 ost_code = ACPI_OST_SC_SUCCESS;
529 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
532 acpi_bus_put_acpi_device(adev);
533 mutex_unlock(&acpi_scan_lock);
534 unlock_device_hotplug();
537 static ssize_t real_power_state_show(struct device *dev,
538 struct device_attribute *attr, char *buf)
540 struct acpi_device *adev = to_acpi_device(dev);
544 ret = acpi_device_get_power(adev, &state);
548 return sprintf(buf, "%s\n", acpi_power_state_string(state));
551 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
553 static ssize_t power_state_show(struct device *dev,
554 struct device_attribute *attr, char *buf)
556 struct acpi_device *adev = to_acpi_device(dev);
558 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
561 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
564 acpi_eject_store(struct device *d, struct device_attribute *attr,
565 const char *buf, size_t count)
567 struct acpi_device *acpi_device = to_acpi_device(d);
568 acpi_object_type not_used;
571 if (!count || buf[0] != '1')
574 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
575 && !acpi_device->driver)
578 status = acpi_get_type(acpi_device->handle, ¬_used);
579 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
582 get_device(&acpi_device->dev);
583 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
584 if (ACPI_SUCCESS(status))
587 put_device(&acpi_device->dev);
588 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
589 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
590 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
593 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
596 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
597 struct acpi_device *acpi_dev = to_acpi_device(dev);
599 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
601 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
603 static ssize_t acpi_device_uid_show(struct device *dev,
604 struct device_attribute *attr, char *buf)
606 struct acpi_device *acpi_dev = to_acpi_device(dev);
608 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
610 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
612 static ssize_t acpi_device_adr_show(struct device *dev,
613 struct device_attribute *attr, char *buf)
615 struct acpi_device *acpi_dev = to_acpi_device(dev);
617 return sprintf(buf, "0x%08x\n",
618 (unsigned int)(acpi_dev->pnp.bus_address));
620 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
623 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
624 struct acpi_device *acpi_dev = to_acpi_device(dev);
625 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
628 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
632 result = sprintf(buf, "%s\n", (char*)path.pointer);
637 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
639 /* sysfs file that shows description text from the ACPI _STR method */
640 static ssize_t description_show(struct device *dev,
641 struct device_attribute *attr,
643 struct acpi_device *acpi_dev = to_acpi_device(dev);
646 if (acpi_dev->pnp.str_obj == NULL)
650 * The _STR object contains a Unicode identifier for a device.
651 * We need to convert to utf-8 so it can be displayed.
653 result = utf16s_to_utf8s(
654 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
655 acpi_dev->pnp.str_obj->buffer.length,
656 UTF16_LITTLE_ENDIAN, buf,
659 buf[result++] = '\n';
663 static DEVICE_ATTR(description, 0444, description_show, NULL);
666 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
668 struct acpi_device *acpi_dev = to_acpi_device(dev);
670 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
672 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
674 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
676 struct acpi_device *acpi_dev = to_acpi_device(dev);
678 unsigned long long sta;
680 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
681 if (ACPI_FAILURE(status))
684 return sprintf(buf, "%llu\n", sta);
686 static DEVICE_ATTR_RO(status);
688 static int acpi_device_setup_files(struct acpi_device *dev)
690 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
692 unsigned long long sun;
696 * Devices gotten from FADT don't have a "path" attribute
699 result = device_create_file(&dev->dev, &dev_attr_path);
704 if (!list_empty(&dev->pnp.ids)) {
705 result = device_create_file(&dev->dev, &dev_attr_hid);
709 result = device_create_file(&dev->dev, &dev_attr_modalias);
715 * If device has _STR, 'description' file is created
717 if (acpi_has_method(dev->handle, "_STR")) {
718 status = acpi_evaluate_object(dev->handle, "_STR",
720 if (ACPI_FAILURE(status))
721 buffer.pointer = NULL;
722 dev->pnp.str_obj = buffer.pointer;
723 result = device_create_file(&dev->dev, &dev_attr_description);
728 if (dev->pnp.type.bus_address)
729 result = device_create_file(&dev->dev, &dev_attr_adr);
730 if (dev->pnp.unique_id)
731 result = device_create_file(&dev->dev, &dev_attr_uid);
733 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
734 if (ACPI_SUCCESS(status)) {
735 dev->pnp.sun = (unsigned long)sun;
736 result = device_create_file(&dev->dev, &dev_attr_sun);
740 dev->pnp.sun = (unsigned long)-1;
743 if (acpi_has_method(dev->handle, "_STA")) {
744 result = device_create_file(&dev->dev, &dev_attr_status);
750 * If device has _EJ0, 'eject' file is created that is used to trigger
751 * hot-removal function from userland.
753 if (acpi_has_method(dev->handle, "_EJ0")) {
754 result = device_create_file(&dev->dev, &dev_attr_eject);
759 if (dev->flags.power_manageable) {
760 result = device_create_file(&dev->dev, &dev_attr_power_state);
764 if (dev->power.flags.power_resources)
765 result = device_create_file(&dev->dev,
766 &dev_attr_real_power_state);
773 static void acpi_device_remove_files(struct acpi_device *dev)
775 if (dev->flags.power_manageable) {
776 device_remove_file(&dev->dev, &dev_attr_power_state);
777 if (dev->power.flags.power_resources)
778 device_remove_file(&dev->dev,
779 &dev_attr_real_power_state);
783 * If device has _STR, remove 'description' file
785 if (acpi_has_method(dev->handle, "_STR")) {
786 kfree(dev->pnp.str_obj);
787 device_remove_file(&dev->dev, &dev_attr_description);
790 * If device has _EJ0, remove 'eject' file.
792 if (acpi_has_method(dev->handle, "_EJ0"))
793 device_remove_file(&dev->dev, &dev_attr_eject);
795 if (acpi_has_method(dev->handle, "_SUN"))
796 device_remove_file(&dev->dev, &dev_attr_sun);
798 if (dev->pnp.unique_id)
799 device_remove_file(&dev->dev, &dev_attr_uid);
800 if (dev->pnp.type.bus_address)
801 device_remove_file(&dev->dev, &dev_attr_adr);
802 device_remove_file(&dev->dev, &dev_attr_modalias);
803 device_remove_file(&dev->dev, &dev_attr_hid);
804 if (acpi_has_method(dev->handle, "_STA"))
805 device_remove_file(&dev->dev, &dev_attr_status);
807 device_remove_file(&dev->dev, &dev_attr_path);
809 /* --------------------------------------------------------------------------
811 -------------------------------------------------------------------------- */
813 static const struct acpi_device_id *__acpi_match_device(
814 struct acpi_device *device, const struct acpi_device_id *ids)
816 const struct acpi_device_id *id;
817 struct acpi_hardware_id *hwid;
820 * If the device is not present, it is unnecessary to load device
823 if (!device->status.present)
826 for (id = ids; id->id[0]; id++)
827 list_for_each_entry(hwid, &device->pnp.ids, list)
828 if (!strcmp((char *) id->id, hwid->id))
835 * acpi_match_device - Match a struct device against a given list of ACPI IDs
836 * @ids: Array of struct acpi_device_id object to match against.
837 * @dev: The device structure to match.
839 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
840 * object for that handle and use that object to match against a given list of
843 * Return a pointer to the first matching ID on success or %NULL on failure.
845 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
846 const struct device *dev)
848 struct acpi_device *adev;
849 acpi_handle handle = ACPI_HANDLE(dev);
851 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
854 return __acpi_match_device(adev, ids);
856 EXPORT_SYMBOL_GPL(acpi_match_device);
858 int acpi_match_device_ids(struct acpi_device *device,
859 const struct acpi_device_id *ids)
861 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
863 EXPORT_SYMBOL(acpi_match_device_ids);
865 static void acpi_free_power_resources_lists(struct acpi_device *device)
869 if (device->wakeup.flags.valid)
870 acpi_power_resources_list_free(&device->wakeup.resources);
872 if (!device->flags.power_manageable)
875 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
876 struct acpi_device_power_state *ps = &device->power.states[i];
877 acpi_power_resources_list_free(&ps->resources);
881 static void acpi_device_release(struct device *dev)
883 struct acpi_device *acpi_dev = to_acpi_device(dev);
885 acpi_free_pnp_ids(&acpi_dev->pnp);
886 acpi_free_power_resources_lists(acpi_dev);
890 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
892 struct acpi_device *acpi_dev = to_acpi_device(dev);
893 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
895 return acpi_dev->flags.match_driver
896 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
899 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
901 struct acpi_device *acpi_dev = to_acpi_device(dev);
904 if (list_empty(&acpi_dev->pnp.ids))
907 if (add_uevent_var(env, "MODALIAS="))
909 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
910 sizeof(env->buf) - env->buflen);
917 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
919 struct acpi_device *device = data;
921 device->driver->ops.notify(device, event);
924 static acpi_status acpi_device_notify_fixed(void *data)
926 struct acpi_device *device = data;
928 /* Fixed hardware devices have no handles */
929 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
933 static int acpi_device_install_notify_handler(struct acpi_device *device)
937 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
939 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
940 acpi_device_notify_fixed,
942 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
944 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
945 acpi_device_notify_fixed,
948 status = acpi_install_notify_handler(device->handle,
953 if (ACPI_FAILURE(status))
958 static void acpi_device_remove_notify_handler(struct acpi_device *device)
960 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
961 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
962 acpi_device_notify_fixed);
963 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
964 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
965 acpi_device_notify_fixed);
967 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
971 static int acpi_device_probe(struct device *dev)
973 struct acpi_device *acpi_dev = to_acpi_device(dev);
974 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
977 if (acpi_dev->handler)
980 if (!acpi_drv->ops.add)
983 ret = acpi_drv->ops.add(acpi_dev);
987 acpi_dev->driver = acpi_drv;
988 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
989 "Driver [%s] successfully bound to device [%s]\n",
990 acpi_drv->name, acpi_dev->pnp.bus_id));
992 if (acpi_drv->ops.notify) {
993 ret = acpi_device_install_notify_handler(acpi_dev);
995 if (acpi_drv->ops.remove)
996 acpi_drv->ops.remove(acpi_dev);
998 acpi_dev->driver = NULL;
999 acpi_dev->driver_data = NULL;
1004 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1005 acpi_drv->name, acpi_dev->pnp.bus_id));
1010 static int acpi_device_remove(struct device * dev)
1012 struct acpi_device *acpi_dev = to_acpi_device(dev);
1013 struct acpi_driver *acpi_drv = acpi_dev->driver;
1016 if (acpi_drv->ops.notify)
1017 acpi_device_remove_notify_handler(acpi_dev);
1018 if (acpi_drv->ops.remove)
1019 acpi_drv->ops.remove(acpi_dev);
1021 acpi_dev->driver = NULL;
1022 acpi_dev->driver_data = NULL;
1028 struct bus_type acpi_bus_type = {
1030 .match = acpi_bus_match,
1031 .probe = acpi_device_probe,
1032 .remove = acpi_device_remove,
1033 .uevent = acpi_device_uevent,
1036 static void acpi_device_del(struct acpi_device *device)
1038 mutex_lock(&acpi_device_lock);
1040 list_del(&device->node);
1042 list_del(&device->wakeup_list);
1043 mutex_unlock(&acpi_device_lock);
1045 acpi_power_add_remove_device(device, false);
1046 acpi_device_remove_files(device);
1048 device->remove(device);
1050 device_del(&device->dev);
1053 static LIST_HEAD(acpi_device_del_list);
1054 static DEFINE_MUTEX(acpi_device_del_lock);
1056 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1059 struct acpi_device *adev;
1061 mutex_lock(&acpi_device_del_lock);
1063 if (list_empty(&acpi_device_del_list)) {
1064 mutex_unlock(&acpi_device_del_lock);
1067 adev = list_first_entry(&acpi_device_del_list,
1068 struct acpi_device, del_list);
1069 list_del(&adev->del_list);
1071 mutex_unlock(&acpi_device_del_lock);
1073 acpi_device_del(adev);
1075 * Drop references to all power resources that might have been
1076 * used by the device.
1078 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1079 put_device(&adev->dev);
1084 * acpi_scan_drop_device - Drop an ACPI device object.
1085 * @handle: Handle of an ACPI namespace node, not used.
1086 * @context: Address of the ACPI device object to drop.
1088 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1089 * namespace node the device object pointed to by @context is attached to.
1091 * The unregistration is carried out asynchronously to avoid running
1092 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1093 * ensure the correct ordering (the device objects must be unregistered in the
1094 * same order in which the corresponding namespace nodes are deleted).
1096 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1098 static DECLARE_WORK(work, acpi_device_del_work_fn);
1099 struct acpi_device *adev = context;
1101 mutex_lock(&acpi_device_del_lock);
1104 * Use the ACPI hotplug workqueue which is ordered, so this work item
1105 * won't run after any hotplug work items submitted subsequently. That
1106 * prevents attempts to register device objects identical to those being
1107 * deleted from happening concurrently (such attempts result from
1108 * hotplug events handled via the ACPI hotplug workqueue). It also will
1109 * run after all of the work items submitted previosuly, which helps
1110 * those work items to ensure that they are not accessing stale device
1113 if (list_empty(&acpi_device_del_list))
1114 acpi_queue_hotplug_work(&work);
1116 list_add_tail(&adev->del_list, &acpi_device_del_list);
1117 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1118 adev->handle = INVALID_ACPI_HANDLE;
1120 mutex_unlock(&acpi_device_del_lock);
1123 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1124 void (*callback)(void *))
1131 status = acpi_get_data_full(handle, acpi_scan_drop_device,
1132 (void **)device, callback);
1133 if (ACPI_FAILURE(status) || !*device) {
1134 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1141 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1143 return acpi_get_device_data(handle, device, NULL);
1145 EXPORT_SYMBOL(acpi_bus_get_device);
1147 static void get_acpi_device(void *dev)
1150 get_device(&((struct acpi_device *)dev)->dev);
1153 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1155 struct acpi_device *adev = NULL;
1157 acpi_get_device_data(handle, &adev, get_acpi_device);
1161 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1163 put_device(&adev->dev);
1166 int acpi_device_add(struct acpi_device *device,
1167 void (*release)(struct device *))
1170 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1173 if (device->handle) {
1176 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1178 if (ACPI_FAILURE(status)) {
1179 acpi_handle_err(device->handle,
1180 "Unable to attach device data\n");
1188 * Link this device to its parent and siblings.
1190 INIT_LIST_HEAD(&device->children);
1191 INIT_LIST_HEAD(&device->node);
1192 INIT_LIST_HEAD(&device->wakeup_list);
1193 INIT_LIST_HEAD(&device->physical_node_list);
1194 INIT_LIST_HEAD(&device->del_list);
1195 mutex_init(&device->physical_node_lock);
1197 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1199 pr_err(PREFIX "Memory allocation error\n");
1204 mutex_lock(&acpi_device_lock);
1206 * Find suitable bus_id and instance number in acpi_bus_id_list
1207 * If failed, create one and link it into acpi_bus_id_list
1209 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1210 if (!strcmp(acpi_device_bus_id->bus_id,
1211 acpi_device_hid(device))) {
1212 acpi_device_bus_id->instance_no++;
1219 acpi_device_bus_id = new_bus_id;
1220 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1221 acpi_device_bus_id->instance_no = 0;
1222 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1224 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1227 list_add_tail(&device->node, &device->parent->children);
1229 if (device->wakeup.flags.valid)
1230 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1231 mutex_unlock(&acpi_device_lock);
1234 device->dev.parent = &device->parent->dev;
1235 device->dev.bus = &acpi_bus_type;
1236 device->dev.release = release;
1237 result = device_add(&device->dev);
1239 dev_err(&device->dev, "Error registering device\n");
1243 result = acpi_device_setup_files(device);
1245 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1246 dev_name(&device->dev));
1251 mutex_lock(&acpi_device_lock);
1253 list_del(&device->node);
1254 list_del(&device->wakeup_list);
1255 mutex_unlock(&acpi_device_lock);
1258 acpi_detach_data(device->handle, acpi_scan_drop_device);
1262 /* --------------------------------------------------------------------------
1264 -------------------------------------------------------------------------- */
1266 * acpi_bus_register_driver - register a driver with the ACPI bus
1267 * @driver: driver being registered
1269 * Registers a driver with the ACPI bus. Searches the namespace for all
1270 * devices that match the driver's criteria and binds. Returns zero for
1271 * success or a negative error status for failure.
1273 int acpi_bus_register_driver(struct acpi_driver *driver)
1279 driver->drv.name = driver->name;
1280 driver->drv.bus = &acpi_bus_type;
1281 driver->drv.owner = driver->owner;
1283 ret = driver_register(&driver->drv);
1287 EXPORT_SYMBOL(acpi_bus_register_driver);
1290 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1291 * @driver: driver to unregister
1293 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1294 * devices that match the driver's criteria and unbinds.
1296 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1298 driver_unregister(&driver->drv);
1301 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1303 /* --------------------------------------------------------------------------
1305 -------------------------------------------------------------------------- */
1306 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1308 struct acpi_device *device = NULL;
1312 * Fixed hardware devices do not appear in the namespace and do not
1313 * have handles, but we fabricate acpi_devices for them, so we have
1314 * to deal with them specially.
1320 status = acpi_get_parent(handle, &handle);
1321 if (ACPI_FAILURE(status))
1322 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1323 } while (acpi_bus_get_device(handle, &device));
1328 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1332 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1333 union acpi_object *obj;
1335 status = acpi_get_handle(handle, "_EJD", &tmp);
1336 if (ACPI_FAILURE(status))
1339 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1340 if (ACPI_SUCCESS(status)) {
1341 obj = buffer.pointer;
1342 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1344 kfree(buffer.pointer);
1348 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1350 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1351 struct acpi_device_wakeup *wakeup)
1353 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1354 union acpi_object *package = NULL;
1355 union acpi_object *element = NULL;
1362 INIT_LIST_HEAD(&wakeup->resources);
1365 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1366 if (ACPI_FAILURE(status)) {
1367 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1371 package = (union acpi_object *)buffer.pointer;
1373 if (!package || package->package.count < 2)
1376 element = &(package->package.elements[0]);
1380 if (element->type == ACPI_TYPE_PACKAGE) {
1381 if ((element->package.count < 2) ||
1382 (element->package.elements[0].type !=
1383 ACPI_TYPE_LOCAL_REFERENCE)
1384 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1387 wakeup->gpe_device =
1388 element->package.elements[0].reference.handle;
1389 wakeup->gpe_number =
1390 (u32) element->package.elements[1].integer.value;
1391 } else if (element->type == ACPI_TYPE_INTEGER) {
1392 wakeup->gpe_device = NULL;
1393 wakeup->gpe_number = element->integer.value;
1398 element = &(package->package.elements[1]);
1399 if (element->type != ACPI_TYPE_INTEGER)
1402 wakeup->sleep_state = element->integer.value;
1404 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1408 if (!list_empty(&wakeup->resources)) {
1411 err = acpi_power_wakeup_list_init(&wakeup->resources,
1414 acpi_handle_warn(handle, "Retrieving current states "
1415 "of wakeup power resources failed\n");
1416 acpi_power_resources_list_free(&wakeup->resources);
1419 if (sleep_state < wakeup->sleep_state) {
1420 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1421 "(S%d) by S%d from power resources\n",
1422 (int)wakeup->sleep_state, sleep_state);
1423 wakeup->sleep_state = sleep_state;
1428 kfree(buffer.pointer);
1432 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1434 struct acpi_device_id button_device_ids[] = {
1440 struct acpi_device_wakeup *wakeup = &device->wakeup;
1442 acpi_event_status event_status;
1444 wakeup->flags.notifier_present = 0;
1446 /* Power button, Lid switch always enable wakeup */
1447 if (!acpi_match_device_ids(device, button_device_ids)) {
1448 wakeup->flags.run_wake = 1;
1449 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1450 /* Do not use Lid/sleep button for S5 wakeup */
1451 if (wakeup->sleep_state == ACPI_STATE_S5)
1452 wakeup->sleep_state = ACPI_STATE_S4;
1454 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1455 device_set_wakeup_capable(&device->dev, true);
1459 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1460 wakeup->gpe_number);
1461 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1463 if (ACPI_FAILURE(status))
1466 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1469 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1473 /* Presence of _PRW indicates wake capable */
1474 if (!acpi_has_method(device->handle, "_PRW"))
1477 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1480 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1484 device->wakeup.flags.valid = 1;
1485 device->wakeup.prepare_count = 0;
1486 acpi_wakeup_gpe_init(device);
1487 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1488 * system for the ACPI device with the _PRW object.
1489 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1490 * So it is necessary to call _DSW object first. Only when it is not
1491 * present will the _PSW object used.
1493 err = acpi_device_sleep_wake(device, 0, 0, 0);
1495 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1496 "error in _DSW or _PSW evaluation\n"));
1499 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1501 struct acpi_device_power_state *ps = &device->power.states[state];
1502 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1503 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1506 INIT_LIST_HEAD(&ps->resources);
1508 /* Evaluate "_PRx" to get referenced power resources */
1509 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1510 if (ACPI_SUCCESS(status)) {
1511 union acpi_object *package = buffer.pointer;
1513 if (buffer.length && package
1514 && package->type == ACPI_TYPE_PACKAGE
1515 && package->package.count) {
1516 int err = acpi_extract_power_resources(package, 0,
1519 device->power.flags.power_resources = 1;
1521 ACPI_FREE(buffer.pointer);
1524 /* Evaluate "_PSx" to see if we can do explicit sets */
1526 if (acpi_has_method(device->handle, pathname))
1527 ps->flags.explicit_set = 1;
1530 * State is valid if there are means to put the device into it.
1531 * D3hot is only valid if _PR3 present.
1533 if (!list_empty(&ps->resources)
1534 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1535 ps->flags.valid = 1;
1536 ps->flags.os_accessible = 1;
1539 ps->power = -1; /* Unknown - driver assigned */
1540 ps->latency = -1; /* Unknown - driver assigned */
1543 static void acpi_bus_get_power_flags(struct acpi_device *device)
1547 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1548 if (!acpi_has_method(device->handle, "_PS0") &&
1549 !acpi_has_method(device->handle, "_PR0"))
1552 device->flags.power_manageable = 1;
1555 * Power Management Flags
1557 if (acpi_has_method(device->handle, "_PSC"))
1558 device->power.flags.explicit_get = 1;
1560 if (acpi_has_method(device->handle, "_IRC"))
1561 device->power.flags.inrush_current = 1;
1563 if (acpi_has_method(device->handle, "_DSW"))
1564 device->power.flags.dsw_present = 1;
1567 * Enumerate supported power management states
1569 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1570 acpi_bus_init_power_state(device, i);
1572 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1574 /* Set defaults for D0 and D3 states (always valid) */
1575 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1576 device->power.states[ACPI_STATE_D0].power = 100;
1577 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1578 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1580 /* Set D3cold's explicit_set flag if _PS3 exists. */
1581 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1582 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1584 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1585 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1586 device->power.flags.power_resources)
1587 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1589 if (acpi_bus_init_power(device)) {
1590 acpi_free_power_resources_lists(device);
1591 device->flags.power_manageable = 0;
1595 static void acpi_bus_get_flags(struct acpi_device *device)
1597 /* Presence of _STA indicates 'dynamic_status' */
1598 if (acpi_has_method(device->handle, "_STA"))
1599 device->flags.dynamic_status = 1;
1601 /* Presence of _RMV indicates 'removable' */
1602 if (acpi_has_method(device->handle, "_RMV"))
1603 device->flags.removable = 1;
1605 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1606 if (acpi_has_method(device->handle, "_EJD") ||
1607 acpi_has_method(device->handle, "_EJ0"))
1608 device->flags.ejectable = 1;
1611 static void acpi_device_get_busid(struct acpi_device *device)
1613 char bus_id[5] = { '?', 0 };
1614 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1620 * The device's Bus ID is simply the object name.
1621 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1623 if (ACPI_IS_ROOT_DEVICE(device)) {
1624 strcpy(device->pnp.bus_id, "ACPI");
1628 switch (device->device_type) {
1629 case ACPI_BUS_TYPE_POWER_BUTTON:
1630 strcpy(device->pnp.bus_id, "PWRF");
1632 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1633 strcpy(device->pnp.bus_id, "SLPF");
1636 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1637 /* Clean up trailing underscores (if any) */
1638 for (i = 3; i > 1; i--) {
1639 if (bus_id[i] == '_')
1644 strcpy(device->pnp.bus_id, bus_id);
1650 * acpi_ata_match - see if an acpi object is an ATA device
1652 * If an acpi object has one of the ACPI ATA methods defined,
1653 * then we can safely call it an ATA device.
1655 bool acpi_ata_match(acpi_handle handle)
1657 return acpi_has_method(handle, "_GTF") ||
1658 acpi_has_method(handle, "_GTM") ||
1659 acpi_has_method(handle, "_STM") ||
1660 acpi_has_method(handle, "_SDD");
1664 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1666 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1667 * then we can safely call it an ejectable drive bay
1669 bool acpi_bay_match(acpi_handle handle)
1671 acpi_handle phandle;
1673 if (!acpi_has_method(handle, "_EJ0"))
1675 if (acpi_ata_match(handle))
1677 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1680 return acpi_ata_match(phandle);
1683 bool acpi_device_is_battery(struct acpi_device *adev)
1685 struct acpi_hardware_id *hwid;
1687 list_for_each_entry(hwid, &adev->pnp.ids, list)
1688 if (!strcmp("PNP0C0A", hwid->id))
1694 static bool is_ejectable_bay(struct acpi_device *adev)
1696 acpi_handle handle = adev->handle;
1698 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1701 return acpi_bay_match(handle);
1705 * acpi_dock_match - see if an acpi object has a _DCK method
1707 bool acpi_dock_match(acpi_handle handle)
1709 return acpi_has_method(handle, "_DCK");
1712 const char *acpi_device_hid(struct acpi_device *device)
1714 struct acpi_hardware_id *hid;
1716 if (list_empty(&device->pnp.ids))
1719 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1722 EXPORT_SYMBOL(acpi_device_hid);
1724 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1726 struct acpi_hardware_id *id;
1728 id = kmalloc(sizeof(*id), GFP_KERNEL);
1732 id->id = kstrdup(dev_id, GFP_KERNEL);
1738 list_add_tail(&id->list, &pnp->ids);
1739 pnp->type.hardware_id = 1;
1743 * Old IBM workstations have a DSDT bug wherein the SMBus object
1744 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1745 * prefix. Work around this.
1747 static bool acpi_ibm_smbus_match(acpi_handle handle)
1749 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1750 struct acpi_buffer path = { sizeof(node_name), node_name };
1752 if (!dmi_name_in_vendors("IBM"))
1755 /* Look for SMBS object */
1756 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1757 strcmp("SMBS", path.pointer))
1760 /* Does it have the necessary (but misnamed) methods? */
1761 if (acpi_has_method(handle, "SBI") &&
1762 acpi_has_method(handle, "SBR") &&
1763 acpi_has_method(handle, "SBW"))
1769 static bool acpi_object_is_system_bus(acpi_handle handle)
1773 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1776 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1783 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1787 struct acpi_device_info *info;
1788 struct acpi_pnp_device_id_list *cid_list;
1791 switch (device_type) {
1792 case ACPI_BUS_TYPE_DEVICE:
1793 if (handle == ACPI_ROOT_OBJECT) {
1794 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1798 status = acpi_get_object_info(handle, &info);
1799 if (ACPI_FAILURE(status)) {
1800 pr_err(PREFIX "%s: Error reading device info\n",
1805 if (info->valid & ACPI_VALID_HID) {
1806 acpi_add_id(pnp, info->hardware_id.string);
1807 pnp->type.platform_id = 1;
1809 if (info->valid & ACPI_VALID_CID) {
1810 cid_list = &info->compatible_id_list;
1811 for (i = 0; i < cid_list->count; i++)
1812 acpi_add_id(pnp, cid_list->ids[i].string);
1814 if (info->valid & ACPI_VALID_ADR) {
1815 pnp->bus_address = info->address;
1816 pnp->type.bus_address = 1;
1818 if (info->valid & ACPI_VALID_UID)
1819 pnp->unique_id = kstrdup(info->unique_id.string,
1825 * Some devices don't reliably have _HIDs & _CIDs, so add
1826 * synthetic HIDs to make sure drivers can find them.
1828 if (acpi_is_video_device(handle))
1829 acpi_add_id(pnp, ACPI_VIDEO_HID);
1830 else if (acpi_bay_match(handle))
1831 acpi_add_id(pnp, ACPI_BAY_HID);
1832 else if (acpi_dock_match(handle))
1833 acpi_add_id(pnp, ACPI_DOCK_HID);
1834 else if (acpi_ibm_smbus_match(handle))
1835 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1836 else if (list_empty(&pnp->ids) &&
1837 acpi_object_is_system_bus(handle)) {
1838 /* \_SB, \_TZ, LNXSYBUS */
1839 acpi_add_id(pnp, ACPI_BUS_HID);
1840 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1841 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1845 case ACPI_BUS_TYPE_POWER:
1846 acpi_add_id(pnp, ACPI_POWER_HID);
1848 case ACPI_BUS_TYPE_PROCESSOR:
1849 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1851 case ACPI_BUS_TYPE_THERMAL:
1852 acpi_add_id(pnp, ACPI_THERMAL_HID);
1854 case ACPI_BUS_TYPE_POWER_BUTTON:
1855 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1857 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1858 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1863 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1865 struct acpi_hardware_id *id, *tmp;
1867 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1871 kfree(pnp->unique_id);
1874 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1875 int type, unsigned long long sta)
1877 INIT_LIST_HEAD(&device->pnp.ids);
1878 device->device_type = type;
1879 device->handle = handle;
1880 device->parent = acpi_bus_get_parent(handle);
1881 acpi_set_device_status(device, sta);
1882 acpi_device_get_busid(device);
1883 acpi_set_pnp_ids(handle, &device->pnp, type);
1884 acpi_bus_get_flags(device);
1885 device->flags.match_driver = false;
1886 device->flags.initialized = true;
1887 device->flags.visited = false;
1888 device_initialize(&device->dev);
1889 dev_set_uevent_suppress(&device->dev, true);
1892 void acpi_device_add_finalize(struct acpi_device *device)
1894 dev_set_uevent_suppress(&device->dev, false);
1895 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1898 static int acpi_add_single_object(struct acpi_device **child,
1899 acpi_handle handle, int type,
1900 unsigned long long sta)
1903 struct acpi_device *device;
1904 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1906 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1908 printk(KERN_ERR PREFIX "Memory allocation error\n");
1912 acpi_init_device_object(device, handle, type, sta);
1913 acpi_bus_get_power_flags(device);
1914 acpi_bus_get_wakeup_device_flags(device);
1916 result = acpi_device_add(device, acpi_device_release);
1918 acpi_device_release(&device->dev);
1922 acpi_power_add_remove_device(device, true);
1923 acpi_device_add_finalize(device);
1924 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1925 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1926 dev_name(&device->dev), (char *) buffer.pointer,
1927 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1928 kfree(buffer.pointer);
1933 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1934 unsigned long long *sta)
1937 acpi_object_type acpi_type;
1939 status = acpi_get_type(handle, &acpi_type);
1940 if (ACPI_FAILURE(status))
1943 switch (acpi_type) {
1944 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1945 case ACPI_TYPE_DEVICE:
1946 *type = ACPI_BUS_TYPE_DEVICE;
1947 status = acpi_bus_get_status_handle(handle, sta);
1948 if (ACPI_FAILURE(status))
1951 case ACPI_TYPE_PROCESSOR:
1952 *type = ACPI_BUS_TYPE_PROCESSOR;
1953 status = acpi_bus_get_status_handle(handle, sta);
1954 if (ACPI_FAILURE(status))
1957 case ACPI_TYPE_THERMAL:
1958 *type = ACPI_BUS_TYPE_THERMAL;
1959 *sta = ACPI_STA_DEFAULT;
1961 case ACPI_TYPE_POWER:
1962 *type = ACPI_BUS_TYPE_POWER;
1963 *sta = ACPI_STA_DEFAULT;
1972 bool acpi_device_is_present(struct acpi_device *adev)
1974 if (adev->status.present || adev->status.functional)
1977 adev->flags.initialized = false;
1981 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1983 const struct acpi_device_id **matchid)
1985 const struct acpi_device_id *devid;
1988 return handler->match(idstr, matchid);
1990 for (devid = handler->ids; devid->id[0]; devid++)
1991 if (!strcmp((char *)devid->id, idstr)) {
2001 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2002 const struct acpi_device_id **matchid)
2004 struct acpi_scan_handler *handler;
2006 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2007 if (acpi_scan_handler_matching(handler, idstr, matchid))
2013 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2015 if (!!hotplug->enabled == !!val)
2018 mutex_lock(&acpi_scan_lock);
2020 hotplug->enabled = val;
2022 mutex_unlock(&acpi_scan_lock);
2025 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2027 struct acpi_hardware_id *hwid;
2029 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2030 acpi_dock_add(adev);
2033 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2034 struct acpi_scan_handler *handler;
2036 handler = acpi_scan_match_handler(hwid->id, NULL);
2038 adev->flags.hotplug_notify = true;
2044 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2045 void *not_used, void **return_value)
2047 struct acpi_device *device = NULL;
2049 unsigned long long sta;
2052 acpi_bus_get_device(handle, &device);
2056 result = acpi_bus_type_and_status(handle, &type, &sta);
2060 if (type == ACPI_BUS_TYPE_POWER) {
2061 acpi_add_power_resource(handle);
2065 acpi_add_single_object(&device, handle, type, sta);
2067 return AE_CTRL_DEPTH;
2069 acpi_scan_init_hotplug(device);
2073 *return_value = device;
2078 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2080 bool *is_spi_i2c_slave_p = data;
2082 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2086 * devices that are connected to UART still need to be enumerated to
2089 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2090 *is_spi_i2c_slave_p = true;
2092 /* no need to do more checking */
2096 static void acpi_default_enumeration(struct acpi_device *device)
2098 struct list_head resource_list;
2099 bool is_spi_i2c_slave = false;
2101 if (!device->pnp.type.platform_id || device->handler)
2105 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2106 * respective parents.
2108 INIT_LIST_HEAD(&resource_list);
2109 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2111 acpi_dev_free_resource_list(&resource_list);
2112 if (!is_spi_i2c_slave)
2113 acpi_create_platform_device(device);
2116 static int acpi_scan_attach_handler(struct acpi_device *device)
2118 struct acpi_hardware_id *hwid;
2121 list_for_each_entry(hwid, &device->pnp.ids, list) {
2122 const struct acpi_device_id *devid;
2123 struct acpi_scan_handler *handler;
2125 handler = acpi_scan_match_handler(hwid->id, &devid);
2127 if (!handler->attach) {
2128 device->pnp.type.platform_id = 0;
2131 device->handler = handler;
2132 ret = handler->attach(device, devid);
2136 device->handler = NULL;
2142 acpi_default_enumeration(device);
2147 static void acpi_bus_attach(struct acpi_device *device)
2149 struct acpi_device *child;
2153 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2154 register_dock_dependent_device(device, ejd);
2156 acpi_bus_get_status(device);
2157 /* Skip devices that are not present. */
2158 if (!acpi_device_is_present(device)) {
2159 device->flags.visited = false;
2162 if (device->handler)
2165 if (!device->flags.initialized) {
2166 acpi_bus_update_power(device, NULL);
2167 device->flags.initialized = true;
2169 device->flags.visited = false;
2170 ret = acpi_scan_attach_handler(device);
2174 device->flags.match_driver = true;
2176 ret = device_attach(&device->dev);
2180 device->flags.visited = true;
2183 list_for_each_entry(child, &device->children, node)
2184 acpi_bus_attach(child);
2188 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2189 * @handle: Root of the namespace scope to scan.
2191 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2194 * If no devices were found, -ENODEV is returned, but it does not mean that
2195 * there has been a real error. There just have been no suitable ACPI objects
2196 * in the table trunk from which the kernel could create a device and add an
2197 * appropriate driver.
2199 * Must be called under acpi_scan_lock.
2201 int acpi_bus_scan(acpi_handle handle)
2203 void *device = NULL;
2205 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2206 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2207 acpi_bus_check_add, NULL, NULL, &device);
2210 acpi_bus_attach(device);
2215 EXPORT_SYMBOL(acpi_bus_scan);
2218 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2219 * @adev: Root of the ACPI namespace scope to walk.
2221 * Must be called under acpi_scan_lock.
2223 void acpi_bus_trim(struct acpi_device *adev)
2225 struct acpi_scan_handler *handler = adev->handler;
2226 struct acpi_device *child;
2228 list_for_each_entry_reverse(child, &adev->children, node)
2229 acpi_bus_trim(child);
2231 adev->flags.match_driver = false;
2233 if (handler->detach)
2234 handler->detach(adev);
2236 adev->handler = NULL;
2238 device_release_driver(&adev->dev);
2241 * Most likely, the device is going away, so put it into D3cold before
2244 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2245 adev->flags.initialized = false;
2246 adev->flags.visited = false;
2248 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2250 static int acpi_bus_scan_fixed(void)
2255 * Enumerate all fixed-feature devices.
2257 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2258 struct acpi_device *device = NULL;
2260 result = acpi_add_single_object(&device, NULL,
2261 ACPI_BUS_TYPE_POWER_BUTTON,
2266 device->flags.match_driver = true;
2267 result = device_attach(&device->dev);
2271 device_init_wakeup(&device->dev, true);
2274 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2275 struct acpi_device *device = NULL;
2277 result = acpi_add_single_object(&device, NULL,
2278 ACPI_BUS_TYPE_SLEEP_BUTTON,
2283 device->flags.match_driver = true;
2284 result = device_attach(&device->dev);
2287 return result < 0 ? result : 0;
2290 int __init acpi_scan_init(void)
2294 result = bus_register(&acpi_bus_type);
2296 /* We don't want to quit even if we failed to add suspend/resume */
2297 printk(KERN_ERR PREFIX "Could not register bus type\n");
2300 acpi_pci_root_init();
2301 acpi_pci_link_init();
2302 acpi_processor_init();
2304 acpi_cmos_rtc_init();
2305 acpi_container_init();
2306 acpi_memory_hotplug_init();
2309 mutex_lock(&acpi_scan_lock);
2311 * Enumerate devices in the ACPI namespace.
2313 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2317 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2321 /* Fixed feature devices do not exist on HW-reduced platform */
2322 if (!acpi_gbl_reduced_hardware) {
2323 result = acpi_bus_scan_fixed();
2325 acpi_detach_data(acpi_root->handle,
2326 acpi_scan_drop_device);
2327 acpi_device_del(acpi_root);
2328 put_device(&acpi_root->dev);
2333 acpi_update_all_gpes();
2336 mutex_unlock(&acpi_scan_lock);