2 * scan.c - support for transforming the ACPI namespace into individual objects
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
15 #include <acpi/acpi_drivers.h>
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 #define STRUCT_TO_INT(s) (*((int*)&s))
22 extern struct acpi_device *acpi_root;
24 #define ACPI_BUS_CLASS "system_bus"
25 #define ACPI_BUS_HID "LNXSYBUS"
26 #define ACPI_BUS_DEVICE_NAME "System Bus"
28 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
31 * If set, devices will be hot-removed even if they cannot be put offline
32 * gracefully (from the kernel's standpoint).
34 bool acpi_force_hot_remove;
36 static const char *dummy_hid = "device";
38 static LIST_HEAD(acpi_device_list);
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);
45 struct acpi_device_bus_id{
47 unsigned int instance_no;
48 struct list_head node;
51 void acpi_scan_lock_acquire(void)
53 mutex_lock(&acpi_scan_lock);
55 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
57 void acpi_scan_lock_release(void)
59 mutex_unlock(&acpi_scan_lock);
61 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
63 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
65 if (!handler || !handler->attach)
68 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
72 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
73 const char *hotplug_profile_name)
77 error = acpi_scan_add_handler(handler);
81 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
86 * Creates hid/cid(s) string needed for modalias and uevent
87 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
88 * char *modalias: "acpi:IBM0001:ACPI0001"
90 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
95 struct acpi_hardware_id *id;
97 if (list_empty(&acpi_dev->pnp.ids))
100 len = snprintf(modalias, size, "acpi:");
103 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
104 count = snprintf(&modalias[len], size, "%s:", id->id);
105 if (count < 0 || count >= size)
111 modalias[len] = '\0';
116 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
117 struct acpi_device *acpi_dev = to_acpi_device(dev);
120 /* Device has no HID and no CID or string is >1024 */
121 len = create_modalias(acpi_dev, buf, 1024);
127 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
129 static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl,
130 void *data, void **ret_p)
132 struct acpi_device *device = NULL;
133 struct acpi_device_physical_node *pn;
134 bool second_pass = (bool)data;
135 acpi_status status = AE_OK;
137 if (acpi_bus_get_device(handle, &device))
140 mutex_lock(&device->physical_node_lock);
142 list_for_each_entry(pn, &device->physical_node_list, node) {
146 /* Skip devices offlined by the first pass. */
150 pn->put_online = false;
152 ret = device_offline(pn->dev);
153 if (acpi_force_hot_remove)
157 pn->put_online = !ret;
167 mutex_unlock(&device->physical_node_lock);
172 static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
173 void *data, void **ret_p)
175 struct acpi_device *device = NULL;
176 struct acpi_device_physical_node *pn;
178 if (acpi_bus_get_device(handle, &device))
181 mutex_lock(&device->physical_node_lock);
183 list_for_each_entry(pn, &device->physical_node_list, node)
184 if (pn->put_online) {
185 device_online(pn->dev);
186 pn->put_online = false;
189 mutex_unlock(&device->physical_node_lock);
194 static int acpi_scan_hot_remove(struct acpi_device *device)
196 acpi_handle handle = device->handle;
197 acpi_handle not_used;
198 struct acpi_object_list arg_list;
199 union acpi_object arg;
200 struct device *errdev;
202 unsigned long long sta;
204 /* If there is no handle, the device node has been unregistered. */
206 dev_dbg(&device->dev, "ACPI handle missing\n");
207 put_device(&device->dev);
211 lock_device_hotplug();
214 * Carry out two passes here and ignore errors in the first pass,
215 * because if the devices in question are memory blocks and
216 * CONFIG_MEMCG is set, one of the blocks may hold data structures
217 * that the other blocks depend on, but it is not known in advance which
220 * If the first pass is successful, the second one isn't needed, though.
223 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
224 NULL, acpi_bus_offline_companions,
225 (void *)false, (void **)&errdev);
226 acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
229 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
230 NULL, acpi_bus_offline_companions,
231 (void *)true , (void **)&errdev);
232 if (!errdev || acpi_force_hot_remove)
233 acpi_bus_offline_companions(handle, 0, (void *)true,
236 if (errdev && !acpi_force_hot_remove) {
237 dev_warn(errdev, "Offline failed.\n");
238 acpi_bus_online_companions(handle, 0, NULL, NULL);
239 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
241 acpi_bus_online_companions, NULL,
244 unlock_device_hotplug();
246 put_device(&device->dev);
251 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
252 "Hot-removing device %s...\n", dev_name(&device->dev)));
254 acpi_bus_trim(device);
256 unlock_device_hotplug();
258 /* Device node has been unregistered. */
259 put_device(&device->dev);
262 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", ¬_used))) {
264 arg_list.pointer = &arg;
265 arg.type = ACPI_TYPE_INTEGER;
266 arg.integer.value = 0;
267 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
271 arg_list.pointer = &arg;
272 arg.type = ACPI_TYPE_INTEGER;
273 arg.integer.value = 1;
278 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
279 if (ACPI_FAILURE(status)) {
280 if (status == AE_NOT_FOUND) {
283 acpi_handle_warn(handle, "Eject failed (0x%x)\n",
290 * Verify if eject was indeed successful. If not, log an error
291 * message. No need to call _OST since _EJ0 call was made OK.
293 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
294 if (ACPI_FAILURE(status)) {
295 acpi_handle_warn(handle,
296 "Status check after eject failed (0x%x)\n", status);
297 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
298 acpi_handle_warn(handle,
299 "Eject incomplete - status 0x%llx\n", sta);
305 static void acpi_bus_device_eject(void *context)
307 acpi_handle handle = context;
308 struct acpi_device *device = NULL;
309 struct acpi_scan_handler *handler;
310 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
312 mutex_lock(&acpi_scan_lock);
314 acpi_bus_get_device(handle, &device);
318 handler = device->handler;
319 if (!handler || !handler->hotplug.enabled) {
320 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
323 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
324 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
325 if (handler->hotplug.mode == AHM_CONTAINER) {
326 device->flags.eject_pending = true;
327 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
331 get_device(&device->dev);
332 error = acpi_scan_hot_remove(device);
338 mutex_unlock(&acpi_scan_lock);
342 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
347 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
349 struct acpi_device *device = NULL;
350 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
353 mutex_lock(&acpi_scan_lock);
354 lock_device_hotplug();
356 acpi_bus_get_device(handle, &device);
358 dev_warn(&device->dev, "Attempt to re-insert\n");
361 acpi_evaluate_hotplug_ost(handle, ost_source,
362 ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
363 error = acpi_bus_scan(handle);
365 acpi_handle_warn(handle, "Namespace scan failure\n");
368 error = acpi_bus_get_device(handle, &device);
370 acpi_handle_warn(handle, "Missing device node object\n");
373 ost_code = ACPI_OST_SC_SUCCESS;
374 if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
375 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
378 unlock_device_hotplug();
379 acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
380 mutex_unlock(&acpi_scan_lock);
383 static void acpi_scan_bus_check(void *context)
385 acpi_scan_bus_device_check((acpi_handle)context,
386 ACPI_NOTIFY_BUS_CHECK);
389 static void acpi_scan_device_check(void *context)
391 acpi_scan_bus_device_check((acpi_handle)context,
392 ACPI_NOTIFY_DEVICE_CHECK);
395 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
400 case ACPI_NOTIFY_BUS_CHECK:
401 acpi_handle_debug(handle,
402 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
403 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
405 case ACPI_NOTIFY_DEVICE_CHECK:
406 acpi_handle_debug(handle,
407 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
408 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
410 case ACPI_NOTIFY_EJECT_REQUEST:
411 acpi_handle_debug(handle,
412 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
413 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
416 /* non-hotplug event; possibly handled by other handler */
420 acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
423 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
425 acpi_osd_exec_callback callback;
426 struct acpi_scan_handler *handler = data;
429 if (!handler->hotplug.enabled)
430 return acpi_hotplug_unsupported(handle, type);
433 case ACPI_NOTIFY_BUS_CHECK:
434 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
435 callback = acpi_scan_bus_check;
437 case ACPI_NOTIFY_DEVICE_CHECK:
438 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
439 callback = acpi_scan_device_check;
441 case ACPI_NOTIFY_EJECT_REQUEST:
442 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
443 callback = acpi_bus_device_eject;
446 /* non-hotplug event; possibly handled by other handler */
449 status = acpi_os_hotplug_execute(callback, handle);
450 if (ACPI_FAILURE(status))
451 acpi_evaluate_hotplug_ost(handle, type,
452 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
457 * acpi_bus_hot_remove_device: hot-remove a device and its children
458 * @context: struct acpi_eject_event pointer (freed in this func)
460 * Hot-remove a device and its children. This function frees up the
461 * memory space passed by arg context, so that the caller may call
462 * this function asynchronously through acpi_os_hotplug_execute().
464 void acpi_bus_hot_remove_device(void *context)
466 struct acpi_eject_event *ej_event = context;
467 struct acpi_device *device = ej_event->device;
468 acpi_handle handle = device->handle;
471 mutex_lock(&acpi_scan_lock);
473 error = acpi_scan_hot_remove(device);
475 acpi_evaluate_hotplug_ost(handle, ej_event->event,
476 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
479 mutex_unlock(&acpi_scan_lock);
482 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
484 static ssize_t real_power_state_show(struct device *dev,
485 struct device_attribute *attr, char *buf)
487 struct acpi_device *adev = to_acpi_device(dev);
491 ret = acpi_device_get_power(adev, &state);
495 return sprintf(buf, "%s\n", acpi_power_state_string(state));
498 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
500 static ssize_t power_state_show(struct device *dev,
501 struct device_attribute *attr, char *buf)
503 struct acpi_device *adev = to_acpi_device(dev);
505 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
508 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
511 acpi_eject_store(struct device *d, struct device_attribute *attr,
512 const char *buf, size_t count)
514 struct acpi_device *acpi_device = to_acpi_device(d);
515 struct acpi_eject_event *ej_event;
516 acpi_object_type not_used;
521 if (!count || buf[0] != '1')
524 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
525 && !acpi_device->driver)
528 status = acpi_get_type(acpi_device->handle, ¬_used);
529 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
532 mutex_lock(&acpi_scan_lock);
534 if (acpi_device->flags.eject_pending) {
535 /* ACPI eject notification event. */
536 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
537 acpi_device->flags.eject_pending = 0;
539 /* Eject initiated by user space. */
540 ost_source = ACPI_OST_EC_OSPM_EJECT;
542 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
547 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
548 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
549 ej_event->device = acpi_device;
550 ej_event->event = ost_source;
551 get_device(&acpi_device->dev);
552 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
553 if (ACPI_FAILURE(status)) {
554 put_device(&acpi_device->dev);
556 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
562 mutex_unlock(&acpi_scan_lock);
566 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
567 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
571 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
574 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
575 struct acpi_device *acpi_dev = to_acpi_device(dev);
577 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
579 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
581 static ssize_t acpi_device_uid_show(struct device *dev,
582 struct device_attribute *attr, char *buf)
584 struct acpi_device *acpi_dev = to_acpi_device(dev);
586 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
588 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
590 static ssize_t acpi_device_adr_show(struct device *dev,
591 struct device_attribute *attr, char *buf)
593 struct acpi_device *acpi_dev = to_acpi_device(dev);
595 return sprintf(buf, "0x%08x\n",
596 (unsigned int)(acpi_dev->pnp.bus_address));
598 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
601 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
602 struct acpi_device *acpi_dev = to_acpi_device(dev);
603 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
606 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
610 result = sprintf(buf, "%s\n", (char*)path.pointer);
615 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
617 /* sysfs file that shows description text from the ACPI _STR method */
618 static ssize_t description_show(struct device *dev,
619 struct device_attribute *attr,
621 struct acpi_device *acpi_dev = to_acpi_device(dev);
624 if (acpi_dev->pnp.str_obj == NULL)
628 * The _STR object contains a Unicode identifier for a device.
629 * We need to convert to utf-8 so it can be displayed.
631 result = utf16s_to_utf8s(
632 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
633 acpi_dev->pnp.str_obj->buffer.length,
634 UTF16_LITTLE_ENDIAN, buf,
637 buf[result++] = '\n';
641 static DEVICE_ATTR(description, 0444, description_show, NULL);
644 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
646 struct acpi_device *acpi_dev = to_acpi_device(dev);
648 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
650 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
652 static int acpi_device_setup_files(struct acpi_device *dev)
654 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
657 unsigned long long sun;
661 * Devices gotten from FADT don't have a "path" attribute
664 result = device_create_file(&dev->dev, &dev_attr_path);
669 if (!list_empty(&dev->pnp.ids)) {
670 result = device_create_file(&dev->dev, &dev_attr_hid);
674 result = device_create_file(&dev->dev, &dev_attr_modalias);
680 * If device has _STR, 'description' file is created
682 status = acpi_get_handle(dev->handle, "_STR", &temp);
683 if (ACPI_SUCCESS(status)) {
684 status = acpi_evaluate_object(dev->handle, "_STR",
686 if (ACPI_FAILURE(status))
687 buffer.pointer = NULL;
688 dev->pnp.str_obj = buffer.pointer;
689 result = device_create_file(&dev->dev, &dev_attr_description);
694 if (dev->pnp.type.bus_address)
695 result = device_create_file(&dev->dev, &dev_attr_adr);
696 if (dev->pnp.unique_id)
697 result = device_create_file(&dev->dev, &dev_attr_uid);
699 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
700 if (ACPI_SUCCESS(status)) {
701 dev->pnp.sun = (unsigned long)sun;
702 result = device_create_file(&dev->dev, &dev_attr_sun);
706 dev->pnp.sun = (unsigned long)-1;
710 * If device has _EJ0, 'eject' file is created that is used to trigger
711 * hot-removal function from userland.
713 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
714 if (ACPI_SUCCESS(status)) {
715 result = device_create_file(&dev->dev, &dev_attr_eject);
720 if (dev->flags.power_manageable) {
721 result = device_create_file(&dev->dev, &dev_attr_power_state);
725 if (dev->power.flags.power_resources)
726 result = device_create_file(&dev->dev,
727 &dev_attr_real_power_state);
734 static void acpi_device_remove_files(struct acpi_device *dev)
739 if (dev->flags.power_manageable) {
740 device_remove_file(&dev->dev, &dev_attr_power_state);
741 if (dev->power.flags.power_resources)
742 device_remove_file(&dev->dev,
743 &dev_attr_real_power_state);
747 * If device has _STR, remove 'description' file
749 status = acpi_get_handle(dev->handle, "_STR", &temp);
750 if (ACPI_SUCCESS(status)) {
751 kfree(dev->pnp.str_obj);
752 device_remove_file(&dev->dev, &dev_attr_description);
755 * If device has _EJ0, remove 'eject' file.
757 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
758 if (ACPI_SUCCESS(status))
759 device_remove_file(&dev->dev, &dev_attr_eject);
761 status = acpi_get_handle(dev->handle, "_SUN", &temp);
762 if (ACPI_SUCCESS(status))
763 device_remove_file(&dev->dev, &dev_attr_sun);
765 if (dev->pnp.unique_id)
766 device_remove_file(&dev->dev, &dev_attr_uid);
767 if (dev->pnp.type.bus_address)
768 device_remove_file(&dev->dev, &dev_attr_adr);
769 device_remove_file(&dev->dev, &dev_attr_modalias);
770 device_remove_file(&dev->dev, &dev_attr_hid);
772 device_remove_file(&dev->dev, &dev_attr_path);
774 /* --------------------------------------------------------------------------
776 -------------------------------------------------------------------------- */
778 static const struct acpi_device_id *__acpi_match_device(
779 struct acpi_device *device, const struct acpi_device_id *ids)
781 const struct acpi_device_id *id;
782 struct acpi_hardware_id *hwid;
785 * If the device is not present, it is unnecessary to load device
788 if (!device->status.present)
791 for (id = ids; id->id[0]; id++)
792 list_for_each_entry(hwid, &device->pnp.ids, list)
793 if (!strcmp((char *) id->id, hwid->id))
800 * acpi_match_device - Match a struct device against a given list of ACPI IDs
801 * @ids: Array of struct acpi_device_id object to match against.
802 * @dev: The device structure to match.
804 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
805 * object for that handle and use that object to match against a given list of
808 * Return a pointer to the first matching ID on success or %NULL on failure.
810 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
811 const struct device *dev)
813 struct acpi_device *adev;
814 acpi_handle handle = ACPI_HANDLE(dev);
816 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
819 return __acpi_match_device(adev, ids);
821 EXPORT_SYMBOL_GPL(acpi_match_device);
823 int acpi_match_device_ids(struct acpi_device *device,
824 const struct acpi_device_id *ids)
826 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
828 EXPORT_SYMBOL(acpi_match_device_ids);
830 static void acpi_free_power_resources_lists(struct acpi_device *device)
834 if (device->wakeup.flags.valid)
835 acpi_power_resources_list_free(&device->wakeup.resources);
837 if (!device->flags.power_manageable)
840 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
841 struct acpi_device_power_state *ps = &device->power.states[i];
842 acpi_power_resources_list_free(&ps->resources);
846 static void acpi_device_release(struct device *dev)
848 struct acpi_device *acpi_dev = to_acpi_device(dev);
850 acpi_free_pnp_ids(&acpi_dev->pnp);
851 acpi_free_power_resources_lists(acpi_dev);
855 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
857 struct acpi_device *acpi_dev = to_acpi_device(dev);
858 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
860 return acpi_dev->flags.match_driver
861 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
864 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
866 struct acpi_device *acpi_dev = to_acpi_device(dev);
869 if (list_empty(&acpi_dev->pnp.ids))
872 if (add_uevent_var(env, "MODALIAS="))
874 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
875 sizeof(env->buf) - env->buflen);
876 if (len >= (sizeof(env->buf) - env->buflen))
882 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
884 struct acpi_device *device = data;
886 device->driver->ops.notify(device, event);
889 static acpi_status acpi_device_notify_fixed(void *data)
891 struct acpi_device *device = data;
893 /* Fixed hardware devices have no handles */
894 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
898 static int acpi_device_install_notify_handler(struct acpi_device *device)
902 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
904 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
905 acpi_device_notify_fixed,
907 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
909 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
910 acpi_device_notify_fixed,
913 status = acpi_install_notify_handler(device->handle,
918 if (ACPI_FAILURE(status))
923 static void acpi_device_remove_notify_handler(struct acpi_device *device)
925 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
926 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
927 acpi_device_notify_fixed);
928 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
929 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
930 acpi_device_notify_fixed);
932 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
936 static int acpi_device_probe(struct device *dev)
938 struct acpi_device *acpi_dev = to_acpi_device(dev);
939 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
942 if (acpi_dev->handler)
945 if (!acpi_drv->ops.add)
948 ret = acpi_drv->ops.add(acpi_dev);
952 acpi_dev->driver = acpi_drv;
953 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
954 "Driver [%s] successfully bound to device [%s]\n",
955 acpi_drv->name, acpi_dev->pnp.bus_id));
957 if (acpi_drv->ops.notify) {
958 ret = acpi_device_install_notify_handler(acpi_dev);
960 if (acpi_drv->ops.remove)
961 acpi_drv->ops.remove(acpi_dev);
963 acpi_dev->driver = NULL;
964 acpi_dev->driver_data = NULL;
969 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
970 acpi_drv->name, acpi_dev->pnp.bus_id));
975 static int acpi_device_remove(struct device * dev)
977 struct acpi_device *acpi_dev = to_acpi_device(dev);
978 struct acpi_driver *acpi_drv = acpi_dev->driver;
981 if (acpi_drv->ops.notify)
982 acpi_device_remove_notify_handler(acpi_dev);
983 if (acpi_drv->ops.remove)
984 acpi_drv->ops.remove(acpi_dev);
986 acpi_dev->driver = NULL;
987 acpi_dev->driver_data = NULL;
993 struct bus_type acpi_bus_type = {
995 .match = acpi_bus_match,
996 .probe = acpi_device_probe,
997 .remove = acpi_device_remove,
998 .uevent = acpi_device_uevent,
1001 int acpi_device_add(struct acpi_device *device,
1002 void (*release)(struct device *))
1005 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1008 if (device->handle) {
1011 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
1013 if (ACPI_FAILURE(status)) {
1014 acpi_handle_err(device->handle,
1015 "Unable to attach device data\n");
1023 * Link this device to its parent and siblings.
1025 INIT_LIST_HEAD(&device->children);
1026 INIT_LIST_HEAD(&device->node);
1027 INIT_LIST_HEAD(&device->wakeup_list);
1028 INIT_LIST_HEAD(&device->physical_node_list);
1029 mutex_init(&device->physical_node_lock);
1030 INIT_LIST_HEAD(&device->power_dependent);
1032 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1034 pr_err(PREFIX "Memory allocation error\n");
1039 mutex_lock(&acpi_device_lock);
1041 * Find suitable bus_id and instance number in acpi_bus_id_list
1042 * If failed, create one and link it into acpi_bus_id_list
1044 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1045 if (!strcmp(acpi_device_bus_id->bus_id,
1046 acpi_device_hid(device))) {
1047 acpi_device_bus_id->instance_no++;
1054 acpi_device_bus_id = new_bus_id;
1055 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1056 acpi_device_bus_id->instance_no = 0;
1057 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1059 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1062 list_add_tail(&device->node, &device->parent->children);
1064 if (device->wakeup.flags.valid)
1065 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1066 mutex_unlock(&acpi_device_lock);
1069 device->dev.parent = &device->parent->dev;
1070 device->dev.bus = &acpi_bus_type;
1071 device->dev.release = release;
1072 result = device_add(&device->dev);
1074 dev_err(&device->dev, "Error registering device\n");
1078 result = acpi_device_setup_files(device);
1080 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1081 dev_name(&device->dev));
1086 mutex_lock(&acpi_device_lock);
1088 list_del(&device->node);
1089 list_del(&device->wakeup_list);
1090 mutex_unlock(&acpi_device_lock);
1093 acpi_detach_data(device->handle, acpi_bus_data_handler);
1097 static void acpi_device_unregister(struct acpi_device *device)
1099 mutex_lock(&acpi_device_lock);
1101 list_del(&device->node);
1103 list_del(&device->wakeup_list);
1104 mutex_unlock(&acpi_device_lock);
1106 acpi_detach_data(device->handle, acpi_bus_data_handler);
1108 acpi_power_add_remove_device(device, false);
1109 acpi_device_remove_files(device);
1111 device->remove(device);
1113 device_del(&device->dev);
1115 * Transition the device to D3cold to drop the reference counts of all
1116 * power resources the device depends on and turn off the ones that have
1117 * no more references.
1119 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1120 device->handle = NULL;
1121 put_device(&device->dev);
1124 /* --------------------------------------------------------------------------
1126 -------------------------------------------------------------------------- */
1128 * acpi_bus_register_driver - register a driver with the ACPI bus
1129 * @driver: driver being registered
1131 * Registers a driver with the ACPI bus. Searches the namespace for all
1132 * devices that match the driver's criteria and binds. Returns zero for
1133 * success or a negative error status for failure.
1135 int acpi_bus_register_driver(struct acpi_driver *driver)
1141 driver->drv.name = driver->name;
1142 driver->drv.bus = &acpi_bus_type;
1143 driver->drv.owner = driver->owner;
1145 ret = driver_register(&driver->drv);
1149 EXPORT_SYMBOL(acpi_bus_register_driver);
1152 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1153 * @driver: driver to unregister
1155 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1156 * devices that match the driver's criteria and unbinds.
1158 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1160 driver_unregister(&driver->drv);
1163 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1165 /* --------------------------------------------------------------------------
1167 -------------------------------------------------------------------------- */
1168 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1170 struct acpi_device *device = NULL;
1174 * Fixed hardware devices do not appear in the namespace and do not
1175 * have handles, but we fabricate acpi_devices for them, so we have
1176 * to deal with them specially.
1182 status = acpi_get_parent(handle, &handle);
1183 if (ACPI_FAILURE(status))
1184 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1185 } while (acpi_bus_get_device(handle, &device));
1190 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1194 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1195 union acpi_object *obj;
1197 status = acpi_get_handle(handle, "_EJD", &tmp);
1198 if (ACPI_FAILURE(status))
1201 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1202 if (ACPI_SUCCESS(status)) {
1203 obj = buffer.pointer;
1204 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1206 kfree(buffer.pointer);
1210 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1212 void acpi_bus_data_handler(acpi_handle handle, void *context)
1220 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1221 struct acpi_device_wakeup *wakeup)
1223 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1224 union acpi_object *package = NULL;
1225 union acpi_object *element = NULL;
1232 INIT_LIST_HEAD(&wakeup->resources);
1235 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1236 if (ACPI_FAILURE(status)) {
1237 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1241 package = (union acpi_object *)buffer.pointer;
1243 if (!package || package->package.count < 2)
1246 element = &(package->package.elements[0]);
1250 if (element->type == ACPI_TYPE_PACKAGE) {
1251 if ((element->package.count < 2) ||
1252 (element->package.elements[0].type !=
1253 ACPI_TYPE_LOCAL_REFERENCE)
1254 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1257 wakeup->gpe_device =
1258 element->package.elements[0].reference.handle;
1259 wakeup->gpe_number =
1260 (u32) element->package.elements[1].integer.value;
1261 } else if (element->type == ACPI_TYPE_INTEGER) {
1262 wakeup->gpe_device = NULL;
1263 wakeup->gpe_number = element->integer.value;
1268 element = &(package->package.elements[1]);
1269 if (element->type != ACPI_TYPE_INTEGER)
1272 wakeup->sleep_state = element->integer.value;
1274 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1278 if (!list_empty(&wakeup->resources)) {
1281 err = acpi_power_wakeup_list_init(&wakeup->resources,
1284 acpi_handle_warn(handle, "Retrieving current states "
1285 "of wakeup power resources failed\n");
1286 acpi_power_resources_list_free(&wakeup->resources);
1289 if (sleep_state < wakeup->sleep_state) {
1290 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1291 "(S%d) by S%d from power resources\n",
1292 (int)wakeup->sleep_state, sleep_state);
1293 wakeup->sleep_state = sleep_state;
1296 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1299 kfree(buffer.pointer);
1303 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1305 struct acpi_device_id button_device_ids[] = {
1312 acpi_event_status event_status;
1314 device->wakeup.flags.notifier_present = 0;
1316 /* Power button, Lid switch always enable wakeup */
1317 if (!acpi_match_device_ids(device, button_device_ids)) {
1318 device->wakeup.flags.run_wake = 1;
1319 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1320 /* Do not use Lid/sleep button for S5 wakeup */
1321 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1322 device->wakeup.sleep_state = ACPI_STATE_S4;
1324 device_set_wakeup_capable(&device->dev, true);
1328 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1329 device->wakeup.gpe_number,
1331 if (status == AE_OK)
1332 device->wakeup.flags.run_wake =
1333 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1336 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1339 acpi_status status = 0;
1342 /* Presence of _PRW indicates wake capable */
1343 status = acpi_get_handle(device->handle, "_PRW", &temp);
1344 if (ACPI_FAILURE(status))
1347 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1350 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1354 device->wakeup.flags.valid = 1;
1355 device->wakeup.prepare_count = 0;
1356 acpi_bus_set_run_wake_flags(device);
1357 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1358 * system for the ACPI device with the _PRW object.
1359 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1360 * So it is necessary to call _DSW object first. Only when it is not
1361 * present will the _PSW object used.
1363 err = acpi_device_sleep_wake(device, 0, 0, 0);
1365 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1366 "error in _DSW or _PSW evaluation\n"));
1369 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1371 struct acpi_device_power_state *ps = &device->power.states[state];
1372 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1373 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1377 INIT_LIST_HEAD(&ps->resources);
1379 /* Evaluate "_PRx" to get referenced power resources */
1380 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1381 if (ACPI_SUCCESS(status)) {
1382 union acpi_object *package = buffer.pointer;
1384 if (buffer.length && package
1385 && package->type == ACPI_TYPE_PACKAGE
1386 && package->package.count) {
1387 int err = acpi_extract_power_resources(package, 0,
1390 device->power.flags.power_resources = 1;
1392 ACPI_FREE(buffer.pointer);
1395 /* Evaluate "_PSx" to see if we can do explicit sets */
1397 status = acpi_get_handle(device->handle, pathname, &handle);
1398 if (ACPI_SUCCESS(status))
1399 ps->flags.explicit_set = 1;
1402 * State is valid if there are means to put the device into it.
1403 * D3hot is only valid if _PR3 present.
1405 if (!list_empty(&ps->resources)
1406 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1407 ps->flags.valid = 1;
1408 ps->flags.os_accessible = 1;
1411 ps->power = -1; /* Unknown - driver assigned */
1412 ps->latency = -1; /* Unknown - driver assigned */
1415 static void acpi_bus_get_power_flags(struct acpi_device *device)
1421 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1422 status = acpi_get_handle(device->handle, "_PS0", &handle);
1423 if (ACPI_FAILURE(status)) {
1424 status = acpi_get_handle(device->handle, "_PR0", &handle);
1425 if (ACPI_FAILURE(status))
1429 device->flags.power_manageable = 1;
1432 * Power Management Flags
1434 status = acpi_get_handle(device->handle, "_PSC", &handle);
1435 if (ACPI_SUCCESS(status))
1436 device->power.flags.explicit_get = 1;
1437 status = acpi_get_handle(device->handle, "_IRC", &handle);
1438 if (ACPI_SUCCESS(status))
1439 device->power.flags.inrush_current = 1;
1442 * Enumerate supported power management states
1444 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1445 acpi_bus_init_power_state(device, i);
1447 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1449 /* Set defaults for D0 and D3 states (always valid) */
1450 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1451 device->power.states[ACPI_STATE_D0].power = 100;
1452 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1453 device->power.states[ACPI_STATE_D3].power = 0;
1455 /* Set D3cold's explicit_set flag if _PS3 exists. */
1456 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1457 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1459 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1460 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1461 device->power.flags.power_resources)
1462 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1464 if (acpi_bus_init_power(device)) {
1465 acpi_free_power_resources_lists(device);
1466 device->flags.power_manageable = 0;
1470 static void acpi_bus_get_flags(struct acpi_device *device)
1472 acpi_status status = AE_OK;
1473 acpi_handle temp = NULL;
1475 /* Presence of _STA indicates 'dynamic_status' */
1476 status = acpi_get_handle(device->handle, "_STA", &temp);
1477 if (ACPI_SUCCESS(status))
1478 device->flags.dynamic_status = 1;
1480 /* Presence of _RMV indicates 'removable' */
1481 status = acpi_get_handle(device->handle, "_RMV", &temp);
1482 if (ACPI_SUCCESS(status))
1483 device->flags.removable = 1;
1485 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1486 status = acpi_get_handle(device->handle, "_EJD", &temp);
1487 if (ACPI_SUCCESS(status))
1488 device->flags.ejectable = 1;
1490 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1491 if (ACPI_SUCCESS(status))
1492 device->flags.ejectable = 1;
1496 static void acpi_device_get_busid(struct acpi_device *device)
1498 char bus_id[5] = { '?', 0 };
1499 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1505 * The device's Bus ID is simply the object name.
1506 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1508 if (ACPI_IS_ROOT_DEVICE(device)) {
1509 strcpy(device->pnp.bus_id, "ACPI");
1513 switch (device->device_type) {
1514 case ACPI_BUS_TYPE_POWER_BUTTON:
1515 strcpy(device->pnp.bus_id, "PWRF");
1517 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1518 strcpy(device->pnp.bus_id, "SLPF");
1521 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1522 /* Clean up trailing underscores (if any) */
1523 for (i = 3; i > 1; i--) {
1524 if (bus_id[i] == '_')
1529 strcpy(device->pnp.bus_id, bus_id);
1535 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1537 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1538 * then we can safely call it an ejectable drive bay
1540 static int acpi_bay_match(acpi_handle handle)
1544 acpi_handle phandle;
1546 status = acpi_get_handle(handle, "_EJ0", &tmp);
1547 if (ACPI_FAILURE(status))
1550 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1551 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1552 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1553 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1556 if (acpi_get_parent(handle, &phandle))
1559 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1560 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1561 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1562 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1569 * acpi_dock_match - see if an acpi object has a _DCK method
1571 static int acpi_dock_match(acpi_handle handle)
1574 return acpi_get_handle(handle, "_DCK", &tmp);
1577 const char *acpi_device_hid(struct acpi_device *device)
1579 struct acpi_hardware_id *hid;
1581 if (list_empty(&device->pnp.ids))
1584 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1587 EXPORT_SYMBOL(acpi_device_hid);
1589 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1591 struct acpi_hardware_id *id;
1593 id = kmalloc(sizeof(*id), GFP_KERNEL);
1597 id->id = kstrdup(dev_id, GFP_KERNEL);
1603 list_add_tail(&id->list, &pnp->ids);
1604 pnp->type.hardware_id = 1;
1608 * Old IBM workstations have a DSDT bug wherein the SMBus object
1609 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1610 * prefix. Work around this.
1612 static int acpi_ibm_smbus_match(acpi_handle handle)
1614 acpi_handle h_dummy;
1615 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1618 if (!dmi_name_in_vendors("IBM"))
1621 /* Look for SMBS object */
1622 result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1626 if (strcmp("SMBS", path.pointer)) {
1631 /* Does it have the necessary (but misnamed) methods? */
1633 if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1634 ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1635 ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1638 kfree(path.pointer);
1642 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1646 struct acpi_device_info *info;
1647 struct acpi_pnp_device_id_list *cid_list;
1650 switch (device_type) {
1651 case ACPI_BUS_TYPE_DEVICE:
1652 if (handle == ACPI_ROOT_OBJECT) {
1653 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1657 status = acpi_get_object_info(handle, &info);
1658 if (ACPI_FAILURE(status)) {
1659 pr_err(PREFIX "%s: Error reading device info\n",
1664 if (info->valid & ACPI_VALID_HID)
1665 acpi_add_id(pnp, info->hardware_id.string);
1666 if (info->valid & ACPI_VALID_CID) {
1667 cid_list = &info->compatible_id_list;
1668 for (i = 0; i < cid_list->count; i++)
1669 acpi_add_id(pnp, cid_list->ids[i].string);
1671 if (info->valid & ACPI_VALID_ADR) {
1672 pnp->bus_address = info->address;
1673 pnp->type.bus_address = 1;
1675 if (info->valid & ACPI_VALID_UID)
1676 pnp->unique_id = kstrdup(info->unique_id.string,
1682 * Some devices don't reliably have _HIDs & _CIDs, so add
1683 * synthetic HIDs to make sure drivers can find them.
1685 if (acpi_is_video_device(handle))
1686 acpi_add_id(pnp, ACPI_VIDEO_HID);
1687 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1688 acpi_add_id(pnp, ACPI_BAY_HID);
1689 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1690 acpi_add_id(pnp, ACPI_DOCK_HID);
1691 else if (!acpi_ibm_smbus_match(handle))
1692 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1693 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1694 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1695 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1696 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1700 case ACPI_BUS_TYPE_POWER:
1701 acpi_add_id(pnp, ACPI_POWER_HID);
1703 case ACPI_BUS_TYPE_PROCESSOR:
1704 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1706 case ACPI_BUS_TYPE_THERMAL:
1707 acpi_add_id(pnp, ACPI_THERMAL_HID);
1709 case ACPI_BUS_TYPE_POWER_BUTTON:
1710 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1712 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1713 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1718 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1720 struct acpi_hardware_id *id, *tmp;
1722 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1726 kfree(pnp->unique_id);
1729 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1730 int type, unsigned long long sta)
1732 INIT_LIST_HEAD(&device->pnp.ids);
1733 device->device_type = type;
1734 device->handle = handle;
1735 device->parent = acpi_bus_get_parent(handle);
1736 STRUCT_TO_INT(device->status) = sta;
1737 acpi_device_get_busid(device);
1738 acpi_set_pnp_ids(handle, &device->pnp, type);
1739 acpi_bus_get_flags(device);
1740 device->flags.match_driver = false;
1741 device_initialize(&device->dev);
1742 dev_set_uevent_suppress(&device->dev, true);
1745 void acpi_device_add_finalize(struct acpi_device *device)
1747 device->flags.match_driver = true;
1748 dev_set_uevent_suppress(&device->dev, false);
1749 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1752 static int acpi_add_single_object(struct acpi_device **child,
1753 acpi_handle handle, int type,
1754 unsigned long long sta)
1757 struct acpi_device *device;
1758 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1760 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1762 printk(KERN_ERR PREFIX "Memory allocation error\n");
1766 acpi_init_device_object(device, handle, type, sta);
1767 acpi_bus_get_power_flags(device);
1768 acpi_bus_get_wakeup_device_flags(device);
1770 result = acpi_device_add(device, acpi_device_release);
1772 acpi_device_release(&device->dev);
1776 acpi_power_add_remove_device(device, true);
1777 acpi_device_add_finalize(device);
1778 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1779 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1780 dev_name(&device->dev), (char *) buffer.pointer,
1781 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1782 kfree(buffer.pointer);
1787 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1788 unsigned long long *sta)
1791 acpi_object_type acpi_type;
1793 status = acpi_get_type(handle, &acpi_type);
1794 if (ACPI_FAILURE(status))
1797 switch (acpi_type) {
1798 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1799 case ACPI_TYPE_DEVICE:
1800 *type = ACPI_BUS_TYPE_DEVICE;
1801 status = acpi_bus_get_status_handle(handle, sta);
1802 if (ACPI_FAILURE(status))
1805 case ACPI_TYPE_PROCESSOR:
1806 *type = ACPI_BUS_TYPE_PROCESSOR;
1807 status = acpi_bus_get_status_handle(handle, sta);
1808 if (ACPI_FAILURE(status))
1811 case ACPI_TYPE_THERMAL:
1812 *type = ACPI_BUS_TYPE_THERMAL;
1813 *sta = ACPI_STA_DEFAULT;
1815 case ACPI_TYPE_POWER:
1816 *type = ACPI_BUS_TYPE_POWER;
1817 *sta = ACPI_STA_DEFAULT;
1826 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1828 const struct acpi_device_id **matchid)
1830 const struct acpi_device_id *devid;
1832 for (devid = handler->ids; devid->id[0]; devid++)
1833 if (!strcmp((char *)devid->id, idstr)) {
1843 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1844 const struct acpi_device_id **matchid)
1846 struct acpi_scan_handler *handler;
1848 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1849 if (acpi_scan_handler_matching(handler, idstr, matchid))
1855 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1857 if (!!hotplug->enabled == !!val)
1860 mutex_lock(&acpi_scan_lock);
1862 hotplug->enabled = val;
1864 mutex_unlock(&acpi_scan_lock);
1867 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1869 struct acpi_device_pnp pnp = {};
1870 struct acpi_hardware_id *hwid;
1871 struct acpi_scan_handler *handler;
1873 INIT_LIST_HEAD(&pnp.ids);
1874 acpi_set_pnp_ids(handle, &pnp, type);
1876 if (!pnp.type.hardware_id)
1880 * This relies on the fact that acpi_install_notify_handler() will not
1881 * install the same notify handler routine twice for the same handle.
1883 list_for_each_entry(hwid, &pnp.ids, list) {
1884 handler = acpi_scan_match_handler(hwid->id, NULL);
1886 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1887 acpi_hotplug_notify_cb, handler);
1893 acpi_free_pnp_ids(&pnp);
1896 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1897 void *not_used, void **return_value)
1899 struct acpi_device *device = NULL;
1901 unsigned long long sta;
1905 acpi_bus_get_device(handle, &device);
1909 result = acpi_bus_type_and_status(handle, &type, &sta);
1913 if (type == ACPI_BUS_TYPE_POWER) {
1914 acpi_add_power_resource(handle);
1918 acpi_scan_init_hotplug(handle, type);
1920 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1921 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1922 struct acpi_device_wakeup wakeup;
1925 status = acpi_get_handle(handle, "_PRW", &temp);
1926 if (ACPI_SUCCESS(status)) {
1927 acpi_bus_extract_wakeup_device_power_package(handle,
1929 acpi_power_resources_list_free(&wakeup.resources);
1931 return AE_CTRL_DEPTH;
1934 acpi_add_single_object(&device, handle, type, sta);
1936 return AE_CTRL_DEPTH;
1940 *return_value = device;
1945 static int acpi_scan_attach_handler(struct acpi_device *device)
1947 struct acpi_hardware_id *hwid;
1950 list_for_each_entry(hwid, &device->pnp.ids, list) {
1951 const struct acpi_device_id *devid;
1952 struct acpi_scan_handler *handler;
1954 handler = acpi_scan_match_handler(hwid->id, &devid);
1956 ret = handler->attach(device, devid);
1958 device->handler = handler;
1960 } else if (ret < 0) {
1968 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1969 void *not_used, void **ret_not_used)
1971 struct acpi_device *device;
1972 unsigned long long sta_not_used;
1976 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1977 * namespace walks prematurely.
1979 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1982 if (acpi_bus_get_device(handle, &device))
1983 return AE_CTRL_DEPTH;
1985 ret = acpi_scan_attach_handler(device);
1987 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1989 ret = device_attach(&device->dev);
1990 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1994 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1995 * @handle: Root of the namespace scope to scan.
1997 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2000 * If no devices were found, -ENODEV is returned, but it does not mean that
2001 * there has been a real error. There just have been no suitable ACPI objects
2002 * in the table trunk from which the kernel could create a device and add an
2003 * appropriate driver.
2005 * Must be called under acpi_scan_lock.
2007 int acpi_bus_scan(acpi_handle handle)
2009 void *device = NULL;
2012 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2013 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2014 acpi_bus_check_add, NULL, NULL, &device);
2018 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
2019 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2020 acpi_bus_device_attach, NULL, NULL, NULL);
2024 EXPORT_SYMBOL(acpi_bus_scan);
2026 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
2027 void *not_used, void **ret_not_used)
2029 struct acpi_device *device = NULL;
2031 if (!acpi_bus_get_device(handle, &device)) {
2032 struct acpi_scan_handler *dev_handler = device->handler;
2035 if (dev_handler->detach)
2036 dev_handler->detach(device);
2038 device->handler = NULL;
2040 device_release_driver(&device->dev);
2046 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
2047 void *not_used, void **ret_not_used)
2049 struct acpi_device *device = NULL;
2051 if (!acpi_bus_get_device(handle, &device))
2052 acpi_device_unregister(device);
2058 * acpi_bus_trim - Remove ACPI device node and all of its descendants
2059 * @start: Root of the ACPI device nodes subtree to remove.
2061 * Must be called under acpi_scan_lock.
2063 void acpi_bus_trim(struct acpi_device *start)
2066 * Execute acpi_bus_device_detach() as a post-order callback to detach
2067 * all ACPI drivers from the device nodes being removed.
2069 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2070 acpi_bus_device_detach, NULL, NULL);
2071 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2073 * Execute acpi_bus_remove() as a post-order callback to remove device
2074 * nodes in the given namespace scope.
2076 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2077 acpi_bus_remove, NULL, NULL);
2078 acpi_bus_remove(start->handle, 0, NULL, NULL);
2080 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2082 static int acpi_bus_scan_fixed(void)
2087 * Enumerate all fixed-feature devices.
2089 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2090 struct acpi_device *device = NULL;
2092 result = acpi_add_single_object(&device, NULL,
2093 ACPI_BUS_TYPE_POWER_BUTTON,
2098 result = device_attach(&device->dev);
2102 device_init_wakeup(&device->dev, true);
2105 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2106 struct acpi_device *device = NULL;
2108 result = acpi_add_single_object(&device, NULL,
2109 ACPI_BUS_TYPE_SLEEP_BUTTON,
2114 result = device_attach(&device->dev);
2117 return result < 0 ? result : 0;
2120 int __init acpi_scan_init(void)
2124 result = bus_register(&acpi_bus_type);
2126 /* We don't want to quit even if we failed to add suspend/resume */
2127 printk(KERN_ERR PREFIX "Could not register bus type\n");
2130 acpi_pci_root_init();
2131 acpi_pci_link_init();
2132 acpi_processor_init();
2133 acpi_platform_init();
2135 acpi_cmos_rtc_init();
2136 acpi_container_init();
2137 acpi_memory_hotplug_init();
2140 mutex_lock(&acpi_scan_lock);
2142 * Enumerate devices in the ACPI namespace.
2144 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2148 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2152 result = acpi_bus_scan_fixed();
2154 acpi_device_unregister(acpi_root);
2158 acpi_update_all_gpes();
2160 acpi_pci_root_hp_init();
2163 mutex_unlock(&acpi_scan_lock);