2 * scan.c - support for transforming the ACPI namespace into individual objects
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
15 #include <acpi/acpi_drivers.h>
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 #define STRUCT_TO_INT(s) (*((int*)&s))
22 extern struct acpi_device *acpi_root;
24 #define ACPI_BUS_CLASS "system_bus"
25 #define ACPI_BUS_HID "LNXSYBUS"
26 #define ACPI_BUS_DEVICE_NAME "System Bus"
28 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
31 * If set, devices will be hot-removed even if they cannot be put offline
32 * gracefully (from the kernel's standpoint).
34 bool acpi_force_hot_remove;
36 static const char *dummy_hid = "device";
38 static LIST_HEAD(acpi_bus_id_list);
39 static DEFINE_MUTEX(acpi_scan_lock);
40 static LIST_HEAD(acpi_scan_handlers_list);
41 DEFINE_MUTEX(acpi_device_lock);
42 LIST_HEAD(acpi_wakeup_device_list);
44 struct acpi_device_bus_id{
46 unsigned int instance_no;
47 struct list_head node;
50 void acpi_scan_lock_acquire(void)
52 mutex_lock(&acpi_scan_lock);
54 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
56 void acpi_scan_lock_release(void)
58 mutex_unlock(&acpi_scan_lock);
60 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
62 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
64 if (!handler || !handler->attach)
67 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
71 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
72 const char *hotplug_profile_name)
76 error = acpi_scan_add_handler(handler);
80 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
85 * Creates hid/cid(s) string needed for modalias and uevent
86 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
87 * char *modalias: "acpi:IBM0001:ACPI0001"
89 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
94 struct acpi_hardware_id *id;
96 if (list_empty(&acpi_dev->pnp.ids))
99 len = snprintf(modalias, size, "acpi:");
102 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
103 count = snprintf(&modalias[len], size, "%s:", id->id);
104 if (count < 0 || count >= size)
110 modalias[len] = '\0';
115 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
116 struct acpi_device *acpi_dev = to_acpi_device(dev);
119 /* Device has no HID and no CID or string is >1024 */
120 len = create_modalias(acpi_dev, buf, 1024);
126 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
128 static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl,
129 void *data, void **ret_p)
131 struct acpi_device *device = NULL;
132 struct acpi_device_physical_node *pn;
133 bool second_pass = (bool)data;
134 acpi_status status = AE_OK;
136 if (acpi_bus_get_device(handle, &device))
139 mutex_lock(&device->physical_node_lock);
141 list_for_each_entry(pn, &device->physical_node_list, node) {
145 /* Skip devices offlined by the first pass. */
149 pn->put_online = false;
151 ret = device_offline(pn->dev);
152 if (acpi_force_hot_remove)
156 pn->put_online = !ret;
166 mutex_unlock(&device->physical_node_lock);
171 static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
172 void *data, void **ret_p)
174 struct acpi_device *device = NULL;
175 struct acpi_device_physical_node *pn;
177 if (acpi_bus_get_device(handle, &device))
180 mutex_lock(&device->physical_node_lock);
182 list_for_each_entry(pn, &device->physical_node_list, node)
183 if (pn->put_online) {
184 device_online(pn->dev);
185 pn->put_online = false;
188 mutex_unlock(&device->physical_node_lock);
193 static int acpi_scan_hot_remove(struct acpi_device *device)
195 acpi_handle handle = device->handle;
196 struct acpi_object_list arg_list;
197 union acpi_object arg;
198 struct device *errdev;
200 unsigned long long sta;
202 /* If there is no handle, the device node has been unregistered. */
204 dev_dbg(&device->dev, "ACPI handle missing\n");
205 put_device(&device->dev);
209 lock_device_hotplug();
212 * Carry out two passes here and ignore errors in the first pass,
213 * because if the devices in question are memory blocks and
214 * CONFIG_MEMCG is set, one of the blocks may hold data structures
215 * that the other blocks depend on, but it is not known in advance which
218 * If the first pass is successful, the second one isn't needed, though.
221 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
222 NULL, acpi_bus_offline_companions,
223 (void *)false, (void **)&errdev);
224 acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
227 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
228 NULL, acpi_bus_offline_companions,
229 (void *)true , (void **)&errdev);
230 if (!errdev || acpi_force_hot_remove)
231 acpi_bus_offline_companions(handle, 0, (void *)true,
234 if (errdev && !acpi_force_hot_remove) {
235 dev_warn(errdev, "Offline failed.\n");
236 acpi_bus_online_companions(handle, 0, NULL, NULL);
237 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
239 acpi_bus_online_companions, NULL,
242 unlock_device_hotplug();
244 put_device(&device->dev);
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
250 "Hot-removing device %s...\n", dev_name(&device->dev)));
252 acpi_bus_trim(device);
254 unlock_device_hotplug();
256 /* Device node has been unregistered. */
257 put_device(&device->dev);
260 if (acpi_has_method(handle, "_LCK")) {
262 arg_list.pointer = &arg;
263 arg.type = ACPI_TYPE_INTEGER;
264 arg.integer.value = 0;
265 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
269 arg_list.pointer = &arg;
270 arg.type = ACPI_TYPE_INTEGER;
271 arg.integer.value = 1;
276 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
277 if (ACPI_FAILURE(status)) {
278 if (status == AE_NOT_FOUND) {
281 acpi_handle_warn(handle, "Eject failed (0x%x)\n",
288 * Verify if eject was indeed successful. If not, log an error
289 * message. No need to call _OST since _EJ0 call was made OK.
291 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
292 if (ACPI_FAILURE(status)) {
293 acpi_handle_warn(handle,
294 "Status check after eject failed (0x%x)\n", status);
295 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
296 acpi_handle_warn(handle,
297 "Eject incomplete - status 0x%llx\n", sta);
303 static void acpi_bus_device_eject(void *context)
305 acpi_handle handle = context;
306 struct acpi_device *device = NULL;
307 struct acpi_scan_handler *handler;
308 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
310 mutex_lock(&acpi_scan_lock);
312 acpi_bus_get_device(handle, &device);
316 handler = device->handler;
317 if (!handler || !handler->hotplug.enabled) {
318 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
321 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
322 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
323 if (handler->hotplug.mode == AHM_CONTAINER) {
324 device->flags.eject_pending = true;
325 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
329 get_device(&device->dev);
330 error = acpi_scan_hot_remove(device);
336 mutex_unlock(&acpi_scan_lock);
340 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
345 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
347 struct acpi_device *device = NULL;
348 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
351 mutex_lock(&acpi_scan_lock);
352 lock_device_hotplug();
354 acpi_bus_get_device(handle, &device);
356 dev_warn(&device->dev, "Attempt to re-insert\n");
359 acpi_evaluate_hotplug_ost(handle, ost_source,
360 ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
361 error = acpi_bus_scan(handle);
363 acpi_handle_warn(handle, "Namespace scan failure\n");
366 error = acpi_bus_get_device(handle, &device);
368 acpi_handle_warn(handle, "Missing device node object\n");
371 ost_code = ACPI_OST_SC_SUCCESS;
372 if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
373 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
376 unlock_device_hotplug();
377 acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
378 mutex_unlock(&acpi_scan_lock);
381 static void acpi_scan_bus_check(void *context)
383 acpi_scan_bus_device_check((acpi_handle)context,
384 ACPI_NOTIFY_BUS_CHECK);
387 static void acpi_scan_device_check(void *context)
389 acpi_scan_bus_device_check((acpi_handle)context,
390 ACPI_NOTIFY_DEVICE_CHECK);
393 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
398 case ACPI_NOTIFY_BUS_CHECK:
399 acpi_handle_debug(handle,
400 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
401 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
403 case ACPI_NOTIFY_DEVICE_CHECK:
404 acpi_handle_debug(handle,
405 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
406 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
408 case ACPI_NOTIFY_EJECT_REQUEST:
409 acpi_handle_debug(handle,
410 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
411 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
414 /* non-hotplug event; possibly handled by other handler */
418 acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
421 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
423 acpi_osd_exec_callback callback;
424 struct acpi_scan_handler *handler = data;
427 if (!handler->hotplug.enabled)
428 return acpi_hotplug_unsupported(handle, type);
431 case ACPI_NOTIFY_BUS_CHECK:
432 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
433 callback = acpi_scan_bus_check;
435 case ACPI_NOTIFY_DEVICE_CHECK:
436 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
437 callback = acpi_scan_device_check;
439 case ACPI_NOTIFY_EJECT_REQUEST:
440 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
441 callback = acpi_bus_device_eject;
444 /* non-hotplug event; possibly handled by other handler */
447 status = acpi_os_hotplug_execute(callback, handle);
448 if (ACPI_FAILURE(status))
449 acpi_evaluate_hotplug_ost(handle, type,
450 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
455 * acpi_bus_hot_remove_device: hot-remove a device and its children
456 * @context: struct acpi_eject_event pointer (freed in this func)
458 * Hot-remove a device and its children. This function frees up the
459 * memory space passed by arg context, so that the caller may call
460 * this function asynchronously through acpi_os_hotplug_execute().
462 void acpi_bus_hot_remove_device(void *context)
464 struct acpi_eject_event *ej_event = context;
465 struct acpi_device *device = ej_event->device;
466 acpi_handle handle = device->handle;
469 mutex_lock(&acpi_scan_lock);
471 error = acpi_scan_hot_remove(device);
473 acpi_evaluate_hotplug_ost(handle, ej_event->event,
474 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
477 mutex_unlock(&acpi_scan_lock);
480 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
482 static ssize_t real_power_state_show(struct device *dev,
483 struct device_attribute *attr, char *buf)
485 struct acpi_device *adev = to_acpi_device(dev);
489 ret = acpi_device_get_power(adev, &state);
493 return sprintf(buf, "%s\n", acpi_power_state_string(state));
496 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
498 static ssize_t power_state_show(struct device *dev,
499 struct device_attribute *attr, char *buf)
501 struct acpi_device *adev = to_acpi_device(dev);
503 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
506 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
509 acpi_eject_store(struct device *d, struct device_attribute *attr,
510 const char *buf, size_t count)
512 struct acpi_device *acpi_device = to_acpi_device(d);
513 struct acpi_eject_event *ej_event;
514 acpi_object_type not_used;
519 if (!count || buf[0] != '1')
522 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
523 && !acpi_device->driver)
526 status = acpi_get_type(acpi_device->handle, ¬_used);
527 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
530 mutex_lock(&acpi_scan_lock);
532 if (acpi_device->flags.eject_pending) {
533 /* ACPI eject notification event. */
534 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
535 acpi_device->flags.eject_pending = 0;
537 /* Eject initiated by user space. */
538 ost_source = ACPI_OST_EC_OSPM_EJECT;
540 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
545 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
546 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
547 ej_event->device = acpi_device;
548 ej_event->event = ost_source;
549 get_device(&acpi_device->dev);
550 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
551 if (ACPI_FAILURE(status)) {
552 put_device(&acpi_device->dev);
554 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
560 mutex_unlock(&acpi_scan_lock);
564 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
565 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
569 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
572 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
573 struct acpi_device *acpi_dev = to_acpi_device(dev);
575 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
577 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
579 static ssize_t acpi_device_uid_show(struct device *dev,
580 struct device_attribute *attr, char *buf)
582 struct acpi_device *acpi_dev = to_acpi_device(dev);
584 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
586 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
588 static ssize_t acpi_device_adr_show(struct device *dev,
589 struct device_attribute *attr, char *buf)
591 struct acpi_device *acpi_dev = to_acpi_device(dev);
593 return sprintf(buf, "0x%08x\n",
594 (unsigned int)(acpi_dev->pnp.bus_address));
596 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
599 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
600 struct acpi_device *acpi_dev = to_acpi_device(dev);
601 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
604 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
608 result = sprintf(buf, "%s\n", (char*)path.pointer);
613 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
615 /* sysfs file that shows description text from the ACPI _STR method */
616 static ssize_t description_show(struct device *dev,
617 struct device_attribute *attr,
619 struct acpi_device *acpi_dev = to_acpi_device(dev);
622 if (acpi_dev->pnp.str_obj == NULL)
626 * The _STR object contains a Unicode identifier for a device.
627 * We need to convert to utf-8 so it can be displayed.
629 result = utf16s_to_utf8s(
630 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
631 acpi_dev->pnp.str_obj->buffer.length,
632 UTF16_LITTLE_ENDIAN, buf,
635 buf[result++] = '\n';
639 static DEVICE_ATTR(description, 0444, description_show, NULL);
642 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
644 struct acpi_device *acpi_dev = to_acpi_device(dev);
646 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
648 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
650 static int acpi_device_setup_files(struct acpi_device *dev)
652 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
654 unsigned long long sun;
658 * Devices gotten from FADT don't have a "path" attribute
661 result = device_create_file(&dev->dev, &dev_attr_path);
666 if (!list_empty(&dev->pnp.ids)) {
667 result = device_create_file(&dev->dev, &dev_attr_hid);
671 result = device_create_file(&dev->dev, &dev_attr_modalias);
677 * If device has _STR, 'description' file is created
679 if (acpi_has_method(dev->handle, "_STR")) {
680 status = acpi_evaluate_object(dev->handle, "_STR",
682 if (ACPI_FAILURE(status))
683 buffer.pointer = NULL;
684 dev->pnp.str_obj = buffer.pointer;
685 result = device_create_file(&dev->dev, &dev_attr_description);
690 if (dev->pnp.type.bus_address)
691 result = device_create_file(&dev->dev, &dev_attr_adr);
692 if (dev->pnp.unique_id)
693 result = device_create_file(&dev->dev, &dev_attr_uid);
695 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
696 if (ACPI_SUCCESS(status)) {
697 dev->pnp.sun = (unsigned long)sun;
698 result = device_create_file(&dev->dev, &dev_attr_sun);
702 dev->pnp.sun = (unsigned long)-1;
706 * If device has _EJ0, 'eject' file is created that is used to trigger
707 * hot-removal function from userland.
709 if (acpi_has_method(dev->handle, "_EJ0")) {
710 result = device_create_file(&dev->dev, &dev_attr_eject);
715 if (dev->flags.power_manageable) {
716 result = device_create_file(&dev->dev, &dev_attr_power_state);
720 if (dev->power.flags.power_resources)
721 result = device_create_file(&dev->dev,
722 &dev_attr_real_power_state);
729 static void acpi_device_remove_files(struct acpi_device *dev)
731 if (dev->flags.power_manageable) {
732 device_remove_file(&dev->dev, &dev_attr_power_state);
733 if (dev->power.flags.power_resources)
734 device_remove_file(&dev->dev,
735 &dev_attr_real_power_state);
739 * If device has _STR, remove 'description' file
741 if (acpi_has_method(dev->handle, "_STR")) {
742 kfree(dev->pnp.str_obj);
743 device_remove_file(&dev->dev, &dev_attr_description);
746 * If device has _EJ0, remove 'eject' file.
748 if (acpi_has_method(dev->handle, "_EJ0"))
749 device_remove_file(&dev->dev, &dev_attr_eject);
751 if (acpi_has_method(dev->handle, "_SUN"))
752 device_remove_file(&dev->dev, &dev_attr_sun);
754 if (dev->pnp.unique_id)
755 device_remove_file(&dev->dev, &dev_attr_uid);
756 if (dev->pnp.type.bus_address)
757 device_remove_file(&dev->dev, &dev_attr_adr);
758 device_remove_file(&dev->dev, &dev_attr_modalias);
759 device_remove_file(&dev->dev, &dev_attr_hid);
761 device_remove_file(&dev->dev, &dev_attr_path);
763 /* --------------------------------------------------------------------------
765 -------------------------------------------------------------------------- */
767 static const struct acpi_device_id *__acpi_match_device(
768 struct acpi_device *device, const struct acpi_device_id *ids)
770 const struct acpi_device_id *id;
771 struct acpi_hardware_id *hwid;
774 * If the device is not present, it is unnecessary to load device
777 if (!device->status.present)
780 for (id = ids; id->id[0]; id++)
781 list_for_each_entry(hwid, &device->pnp.ids, list)
782 if (!strcmp((char *) id->id, hwid->id))
789 * acpi_match_device - Match a struct device against a given list of ACPI IDs
790 * @ids: Array of struct acpi_device_id object to match against.
791 * @dev: The device structure to match.
793 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
794 * object for that handle and use that object to match against a given list of
797 * Return a pointer to the first matching ID on success or %NULL on failure.
799 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
800 const struct device *dev)
802 struct acpi_device *adev;
803 acpi_handle handle = ACPI_HANDLE(dev);
805 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
808 return __acpi_match_device(adev, ids);
810 EXPORT_SYMBOL_GPL(acpi_match_device);
812 int acpi_match_device_ids(struct acpi_device *device,
813 const struct acpi_device_id *ids)
815 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
817 EXPORT_SYMBOL(acpi_match_device_ids);
819 static void acpi_free_power_resources_lists(struct acpi_device *device)
823 if (device->wakeup.flags.valid)
824 acpi_power_resources_list_free(&device->wakeup.resources);
826 if (!device->flags.power_manageable)
829 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
830 struct acpi_device_power_state *ps = &device->power.states[i];
831 acpi_power_resources_list_free(&ps->resources);
835 static void acpi_device_release(struct device *dev)
837 struct acpi_device *acpi_dev = to_acpi_device(dev);
839 acpi_free_pnp_ids(&acpi_dev->pnp);
840 acpi_free_power_resources_lists(acpi_dev);
844 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
846 struct acpi_device *acpi_dev = to_acpi_device(dev);
847 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
849 return acpi_dev->flags.match_driver
850 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
853 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
855 struct acpi_device *acpi_dev = to_acpi_device(dev);
858 if (list_empty(&acpi_dev->pnp.ids))
861 if (add_uevent_var(env, "MODALIAS="))
863 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
864 sizeof(env->buf) - env->buflen);
865 if (len >= (sizeof(env->buf) - env->buflen))
871 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
873 struct acpi_device *device = data;
875 device->driver->ops.notify(device, event);
878 static acpi_status acpi_device_notify_fixed(void *data)
880 struct acpi_device *device = data;
882 /* Fixed hardware devices have no handles */
883 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
887 static int acpi_device_install_notify_handler(struct acpi_device *device)
891 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
893 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
894 acpi_device_notify_fixed,
896 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
898 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
899 acpi_device_notify_fixed,
902 status = acpi_install_notify_handler(device->handle,
907 if (ACPI_FAILURE(status))
912 static void acpi_device_remove_notify_handler(struct acpi_device *device)
914 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
915 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
916 acpi_device_notify_fixed);
917 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
918 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
919 acpi_device_notify_fixed);
921 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
925 static int acpi_device_probe(struct device *dev)
927 struct acpi_device *acpi_dev = to_acpi_device(dev);
928 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
931 if (acpi_dev->handler)
934 if (!acpi_drv->ops.add)
937 ret = acpi_drv->ops.add(acpi_dev);
941 acpi_dev->driver = acpi_drv;
942 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
943 "Driver [%s] successfully bound to device [%s]\n",
944 acpi_drv->name, acpi_dev->pnp.bus_id));
946 if (acpi_drv->ops.notify) {
947 ret = acpi_device_install_notify_handler(acpi_dev);
949 if (acpi_drv->ops.remove)
950 acpi_drv->ops.remove(acpi_dev);
952 acpi_dev->driver = NULL;
953 acpi_dev->driver_data = NULL;
958 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
959 acpi_drv->name, acpi_dev->pnp.bus_id));
964 static int acpi_device_remove(struct device * dev)
966 struct acpi_device *acpi_dev = to_acpi_device(dev);
967 struct acpi_driver *acpi_drv = acpi_dev->driver;
970 if (acpi_drv->ops.notify)
971 acpi_device_remove_notify_handler(acpi_dev);
972 if (acpi_drv->ops.remove)
973 acpi_drv->ops.remove(acpi_dev);
975 acpi_dev->driver = NULL;
976 acpi_dev->driver_data = NULL;
982 struct bus_type acpi_bus_type = {
984 .match = acpi_bus_match,
985 .probe = acpi_device_probe,
986 .remove = acpi_device_remove,
987 .uevent = acpi_device_uevent,
990 int acpi_device_add(struct acpi_device *device,
991 void (*release)(struct device *))
994 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
997 if (device->handle) {
1000 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
1002 if (ACPI_FAILURE(status)) {
1003 acpi_handle_err(device->handle,
1004 "Unable to attach device data\n");
1012 * Link this device to its parent and siblings.
1014 INIT_LIST_HEAD(&device->children);
1015 INIT_LIST_HEAD(&device->node);
1016 INIT_LIST_HEAD(&device->wakeup_list);
1017 INIT_LIST_HEAD(&device->physical_node_list);
1018 mutex_init(&device->physical_node_lock);
1019 INIT_LIST_HEAD(&device->power_dependent);
1021 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1023 pr_err(PREFIX "Memory allocation error\n");
1028 mutex_lock(&acpi_device_lock);
1030 * Find suitable bus_id and instance number in acpi_bus_id_list
1031 * If failed, create one and link it into acpi_bus_id_list
1033 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1034 if (!strcmp(acpi_device_bus_id->bus_id,
1035 acpi_device_hid(device))) {
1036 acpi_device_bus_id->instance_no++;
1043 acpi_device_bus_id = new_bus_id;
1044 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1045 acpi_device_bus_id->instance_no = 0;
1046 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1048 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1051 list_add_tail(&device->node, &device->parent->children);
1053 if (device->wakeup.flags.valid)
1054 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1055 mutex_unlock(&acpi_device_lock);
1058 device->dev.parent = &device->parent->dev;
1059 device->dev.bus = &acpi_bus_type;
1060 device->dev.release = release;
1061 result = device_add(&device->dev);
1063 dev_err(&device->dev, "Error registering device\n");
1067 result = acpi_device_setup_files(device);
1069 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1070 dev_name(&device->dev));
1075 mutex_lock(&acpi_device_lock);
1077 list_del(&device->node);
1078 list_del(&device->wakeup_list);
1079 mutex_unlock(&acpi_device_lock);
1082 acpi_detach_data(device->handle, acpi_bus_data_handler);
1086 static void acpi_device_unregister(struct acpi_device *device)
1088 mutex_lock(&acpi_device_lock);
1090 list_del(&device->node);
1092 list_del(&device->wakeup_list);
1093 mutex_unlock(&acpi_device_lock);
1095 acpi_detach_data(device->handle, acpi_bus_data_handler);
1097 acpi_power_add_remove_device(device, false);
1098 acpi_device_remove_files(device);
1100 device->remove(device);
1102 device_del(&device->dev);
1104 * Transition the device to D3cold to drop the reference counts of all
1105 * power resources the device depends on and turn off the ones that have
1106 * no more references.
1108 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1109 device->handle = NULL;
1110 put_device(&device->dev);
1113 /* --------------------------------------------------------------------------
1115 -------------------------------------------------------------------------- */
1117 * acpi_bus_register_driver - register a driver with the ACPI bus
1118 * @driver: driver being registered
1120 * Registers a driver with the ACPI bus. Searches the namespace for all
1121 * devices that match the driver's criteria and binds. Returns zero for
1122 * success or a negative error status for failure.
1124 int acpi_bus_register_driver(struct acpi_driver *driver)
1130 driver->drv.name = driver->name;
1131 driver->drv.bus = &acpi_bus_type;
1132 driver->drv.owner = driver->owner;
1134 ret = driver_register(&driver->drv);
1138 EXPORT_SYMBOL(acpi_bus_register_driver);
1141 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1142 * @driver: driver to unregister
1144 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1145 * devices that match the driver's criteria and unbinds.
1147 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1149 driver_unregister(&driver->drv);
1152 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1154 /* --------------------------------------------------------------------------
1156 -------------------------------------------------------------------------- */
1157 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1159 struct acpi_device *device = NULL;
1163 * Fixed hardware devices do not appear in the namespace and do not
1164 * have handles, but we fabricate acpi_devices for them, so we have
1165 * to deal with them specially.
1171 status = acpi_get_parent(handle, &handle);
1172 if (ACPI_FAILURE(status))
1173 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1174 } while (acpi_bus_get_device(handle, &device));
1179 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1183 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1184 union acpi_object *obj;
1186 status = acpi_get_handle(handle, "_EJD", &tmp);
1187 if (ACPI_FAILURE(status))
1190 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1191 if (ACPI_SUCCESS(status)) {
1192 obj = buffer.pointer;
1193 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1195 kfree(buffer.pointer);
1199 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1201 void acpi_bus_data_handler(acpi_handle handle, void *context)
1209 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1210 struct acpi_device_wakeup *wakeup)
1212 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1213 union acpi_object *package = NULL;
1214 union acpi_object *element = NULL;
1221 INIT_LIST_HEAD(&wakeup->resources);
1224 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1225 if (ACPI_FAILURE(status)) {
1226 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1230 package = (union acpi_object *)buffer.pointer;
1232 if (!package || package->package.count < 2)
1235 element = &(package->package.elements[0]);
1239 if (element->type == ACPI_TYPE_PACKAGE) {
1240 if ((element->package.count < 2) ||
1241 (element->package.elements[0].type !=
1242 ACPI_TYPE_LOCAL_REFERENCE)
1243 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1246 wakeup->gpe_device =
1247 element->package.elements[0].reference.handle;
1248 wakeup->gpe_number =
1249 (u32) element->package.elements[1].integer.value;
1250 } else if (element->type == ACPI_TYPE_INTEGER) {
1251 wakeup->gpe_device = NULL;
1252 wakeup->gpe_number = element->integer.value;
1257 element = &(package->package.elements[1]);
1258 if (element->type != ACPI_TYPE_INTEGER)
1261 wakeup->sleep_state = element->integer.value;
1263 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1267 if (!list_empty(&wakeup->resources)) {
1270 err = acpi_power_wakeup_list_init(&wakeup->resources,
1273 acpi_handle_warn(handle, "Retrieving current states "
1274 "of wakeup power resources failed\n");
1275 acpi_power_resources_list_free(&wakeup->resources);
1278 if (sleep_state < wakeup->sleep_state) {
1279 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1280 "(S%d) by S%d from power resources\n",
1281 (int)wakeup->sleep_state, sleep_state);
1282 wakeup->sleep_state = sleep_state;
1285 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1288 kfree(buffer.pointer);
1292 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1294 struct acpi_device_id button_device_ids[] = {
1301 acpi_event_status event_status;
1303 device->wakeup.flags.notifier_present = 0;
1305 /* Power button, Lid switch always enable wakeup */
1306 if (!acpi_match_device_ids(device, button_device_ids)) {
1307 device->wakeup.flags.run_wake = 1;
1308 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1309 /* Do not use Lid/sleep button for S5 wakeup */
1310 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1311 device->wakeup.sleep_state = ACPI_STATE_S4;
1313 device_set_wakeup_capable(&device->dev, true);
1317 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1318 device->wakeup.gpe_number,
1320 if (status == AE_OK)
1321 device->wakeup.flags.run_wake =
1322 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1325 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1329 /* Presence of _PRW indicates wake capable */
1330 if (!acpi_has_method(device->handle, "_PRW"))
1333 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1336 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1340 device->wakeup.flags.valid = 1;
1341 device->wakeup.prepare_count = 0;
1342 acpi_bus_set_run_wake_flags(device);
1343 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1344 * system for the ACPI device with the _PRW object.
1345 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1346 * So it is necessary to call _DSW object first. Only when it is not
1347 * present will the _PSW object used.
1349 err = acpi_device_sleep_wake(device, 0, 0, 0);
1351 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1352 "error in _DSW or _PSW evaluation\n"));
1355 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1357 struct acpi_device_power_state *ps = &device->power.states[state];
1358 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1359 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1362 INIT_LIST_HEAD(&ps->resources);
1364 /* Evaluate "_PRx" to get referenced power resources */
1365 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1366 if (ACPI_SUCCESS(status)) {
1367 union acpi_object *package = buffer.pointer;
1369 if (buffer.length && package
1370 && package->type == ACPI_TYPE_PACKAGE
1371 && package->package.count) {
1372 int err = acpi_extract_power_resources(package, 0,
1375 device->power.flags.power_resources = 1;
1377 ACPI_FREE(buffer.pointer);
1380 /* Evaluate "_PSx" to see if we can do explicit sets */
1382 if (acpi_has_method(device->handle, pathname))
1383 ps->flags.explicit_set = 1;
1386 * State is valid if there are means to put the device into it.
1387 * D3hot is only valid if _PR3 present.
1389 if (!list_empty(&ps->resources)
1390 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1391 ps->flags.valid = 1;
1392 ps->flags.os_accessible = 1;
1395 ps->power = -1; /* Unknown - driver assigned */
1396 ps->latency = -1; /* Unknown - driver assigned */
1399 static void acpi_bus_get_power_flags(struct acpi_device *device)
1403 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1404 if (!acpi_has_method(device->handle, "_PS0") &&
1405 !acpi_has_method(device->handle, "_PR0"))
1408 device->flags.power_manageable = 1;
1411 * Power Management Flags
1413 if (acpi_has_method(device->handle, "_PSC"))
1414 device->power.flags.explicit_get = 1;
1415 if (acpi_has_method(device->handle, "_IRC"))
1416 device->power.flags.inrush_current = 1;
1419 * Enumerate supported power management states
1421 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1422 acpi_bus_init_power_state(device, i);
1424 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1426 /* Set defaults for D0 and D3 states (always valid) */
1427 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1428 device->power.states[ACPI_STATE_D0].power = 100;
1429 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1430 device->power.states[ACPI_STATE_D3].power = 0;
1432 /* Set D3cold's explicit_set flag if _PS3 exists. */
1433 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1434 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1436 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1437 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1438 device->power.flags.power_resources)
1439 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1441 if (acpi_bus_init_power(device)) {
1442 acpi_free_power_resources_lists(device);
1443 device->flags.power_manageable = 0;
1447 static void acpi_bus_get_flags(struct acpi_device *device)
1449 /* Presence of _STA indicates 'dynamic_status' */
1450 if (acpi_has_method(device->handle, "_STA"))
1451 device->flags.dynamic_status = 1;
1453 /* Presence of _RMV indicates 'removable' */
1454 if (acpi_has_method(device->handle, "_RMV"))
1455 device->flags.removable = 1;
1457 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1458 if (acpi_has_method(device->handle, "_EJD") ||
1459 acpi_has_method(device->handle, "_EJ0"))
1460 device->flags.ejectable = 1;
1463 static void acpi_device_get_busid(struct acpi_device *device)
1465 char bus_id[5] = { '?', 0 };
1466 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1472 * The device's Bus ID is simply the object name.
1473 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1475 if (ACPI_IS_ROOT_DEVICE(device)) {
1476 strcpy(device->pnp.bus_id, "ACPI");
1480 switch (device->device_type) {
1481 case ACPI_BUS_TYPE_POWER_BUTTON:
1482 strcpy(device->pnp.bus_id, "PWRF");
1484 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1485 strcpy(device->pnp.bus_id, "SLPF");
1488 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1489 /* Clean up trailing underscores (if any) */
1490 for (i = 3; i > 1; i--) {
1491 if (bus_id[i] == '_')
1496 strcpy(device->pnp.bus_id, bus_id);
1502 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1504 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1505 * then we can safely call it an ejectable drive bay
1507 static int acpi_bay_match(acpi_handle handle)
1509 acpi_handle phandle;
1511 if (!acpi_has_method(handle, "_EJ0"))
1514 if (acpi_has_method(handle, "_GTF") ||
1515 acpi_has_method(handle, "_GTM") ||
1516 acpi_has_method(handle, "_STM") ||
1517 acpi_has_method(handle, "_SDD"))
1520 if (acpi_get_parent(handle, &phandle))
1523 if (acpi_has_method(phandle, "_GTF") ||
1524 acpi_has_method(phandle, "_GTM") ||
1525 acpi_has_method(phandle, "_STM") ||
1526 acpi_has_method(phandle, "_SDD"))
1533 * acpi_dock_match - see if an acpi object has a _DCK method
1535 static int acpi_dock_match(acpi_handle handle)
1538 return acpi_get_handle(handle, "_DCK", &tmp);
1541 const char *acpi_device_hid(struct acpi_device *device)
1543 struct acpi_hardware_id *hid;
1545 if (list_empty(&device->pnp.ids))
1548 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1551 EXPORT_SYMBOL(acpi_device_hid);
1553 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1555 struct acpi_hardware_id *id;
1557 id = kmalloc(sizeof(*id), GFP_KERNEL);
1561 id->id = kstrdup(dev_id, GFP_KERNEL);
1567 list_add_tail(&id->list, &pnp->ids);
1568 pnp->type.hardware_id = 1;
1572 * Old IBM workstations have a DSDT bug wherein the SMBus object
1573 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1574 * prefix. Work around this.
1576 static int acpi_ibm_smbus_match(acpi_handle handle)
1578 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1581 if (!dmi_name_in_vendors("IBM"))
1584 /* Look for SMBS object */
1585 result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1589 if (strcmp("SMBS", path.pointer)) {
1594 /* Does it have the necessary (but misnamed) methods? */
1596 if (acpi_has_method(handle, "SBI") &&
1597 acpi_has_method(handle, "SBR") &&
1598 acpi_has_method(handle, "SBW"))
1601 kfree(path.pointer);
1605 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1609 struct acpi_device_info *info;
1610 struct acpi_pnp_device_id_list *cid_list;
1613 switch (device_type) {
1614 case ACPI_BUS_TYPE_DEVICE:
1615 if (handle == ACPI_ROOT_OBJECT) {
1616 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1620 status = acpi_get_object_info(handle, &info);
1621 if (ACPI_FAILURE(status)) {
1622 pr_err(PREFIX "%s: Error reading device info\n",
1627 if (info->valid & ACPI_VALID_HID)
1628 acpi_add_id(pnp, info->hardware_id.string);
1629 if (info->valid & ACPI_VALID_CID) {
1630 cid_list = &info->compatible_id_list;
1631 for (i = 0; i < cid_list->count; i++)
1632 acpi_add_id(pnp, cid_list->ids[i].string);
1634 if (info->valid & ACPI_VALID_ADR) {
1635 pnp->bus_address = info->address;
1636 pnp->type.bus_address = 1;
1638 if (info->valid & ACPI_VALID_UID)
1639 pnp->unique_id = kstrdup(info->unique_id.string,
1645 * Some devices don't reliably have _HIDs & _CIDs, so add
1646 * synthetic HIDs to make sure drivers can find them.
1648 if (acpi_is_video_device(handle))
1649 acpi_add_id(pnp, ACPI_VIDEO_HID);
1650 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1651 acpi_add_id(pnp, ACPI_BAY_HID);
1652 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1653 acpi_add_id(pnp, ACPI_DOCK_HID);
1654 else if (!acpi_ibm_smbus_match(handle))
1655 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1656 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1657 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1658 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1659 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1663 case ACPI_BUS_TYPE_POWER:
1664 acpi_add_id(pnp, ACPI_POWER_HID);
1666 case ACPI_BUS_TYPE_PROCESSOR:
1667 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1669 case ACPI_BUS_TYPE_THERMAL:
1670 acpi_add_id(pnp, ACPI_THERMAL_HID);
1672 case ACPI_BUS_TYPE_POWER_BUTTON:
1673 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1675 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1676 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1681 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1683 struct acpi_hardware_id *id, *tmp;
1685 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1689 kfree(pnp->unique_id);
1692 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1693 int type, unsigned long long sta)
1695 INIT_LIST_HEAD(&device->pnp.ids);
1696 device->device_type = type;
1697 device->handle = handle;
1698 device->parent = acpi_bus_get_parent(handle);
1699 STRUCT_TO_INT(device->status) = sta;
1700 acpi_device_get_busid(device);
1701 acpi_set_pnp_ids(handle, &device->pnp, type);
1702 acpi_bus_get_flags(device);
1703 device->flags.match_driver = false;
1704 device_initialize(&device->dev);
1705 dev_set_uevent_suppress(&device->dev, true);
1708 void acpi_device_add_finalize(struct acpi_device *device)
1710 device->flags.match_driver = true;
1711 dev_set_uevent_suppress(&device->dev, false);
1712 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1715 static int acpi_add_single_object(struct acpi_device **child,
1716 acpi_handle handle, int type,
1717 unsigned long long sta)
1720 struct acpi_device *device;
1721 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1723 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1725 printk(KERN_ERR PREFIX "Memory allocation error\n");
1729 acpi_init_device_object(device, handle, type, sta);
1730 acpi_bus_get_power_flags(device);
1731 acpi_bus_get_wakeup_device_flags(device);
1733 result = acpi_device_add(device, acpi_device_release);
1735 acpi_device_release(&device->dev);
1739 acpi_power_add_remove_device(device, true);
1740 acpi_device_add_finalize(device);
1741 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1742 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1743 dev_name(&device->dev), (char *) buffer.pointer,
1744 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1745 kfree(buffer.pointer);
1750 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1751 unsigned long long *sta)
1754 acpi_object_type acpi_type;
1756 status = acpi_get_type(handle, &acpi_type);
1757 if (ACPI_FAILURE(status))
1760 switch (acpi_type) {
1761 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1762 case ACPI_TYPE_DEVICE:
1763 *type = ACPI_BUS_TYPE_DEVICE;
1764 status = acpi_bus_get_status_handle(handle, sta);
1765 if (ACPI_FAILURE(status))
1768 case ACPI_TYPE_PROCESSOR:
1769 *type = ACPI_BUS_TYPE_PROCESSOR;
1770 status = acpi_bus_get_status_handle(handle, sta);
1771 if (ACPI_FAILURE(status))
1774 case ACPI_TYPE_THERMAL:
1775 *type = ACPI_BUS_TYPE_THERMAL;
1776 *sta = ACPI_STA_DEFAULT;
1778 case ACPI_TYPE_POWER:
1779 *type = ACPI_BUS_TYPE_POWER;
1780 *sta = ACPI_STA_DEFAULT;
1789 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1791 const struct acpi_device_id **matchid)
1793 const struct acpi_device_id *devid;
1795 for (devid = handler->ids; devid->id[0]; devid++)
1796 if (!strcmp((char *)devid->id, idstr)) {
1806 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1807 const struct acpi_device_id **matchid)
1809 struct acpi_scan_handler *handler;
1811 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1812 if (acpi_scan_handler_matching(handler, idstr, matchid))
1818 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1820 if (!!hotplug->enabled == !!val)
1823 mutex_lock(&acpi_scan_lock);
1825 hotplug->enabled = val;
1827 mutex_unlock(&acpi_scan_lock);
1830 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1832 struct acpi_device_pnp pnp = {};
1833 struct acpi_hardware_id *hwid;
1834 struct acpi_scan_handler *handler;
1836 INIT_LIST_HEAD(&pnp.ids);
1837 acpi_set_pnp_ids(handle, &pnp, type);
1839 if (!pnp.type.hardware_id)
1843 * This relies on the fact that acpi_install_notify_handler() will not
1844 * install the same notify handler routine twice for the same handle.
1846 list_for_each_entry(hwid, &pnp.ids, list) {
1847 handler = acpi_scan_match_handler(hwid->id, NULL);
1849 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1850 acpi_hotplug_notify_cb, handler);
1856 acpi_free_pnp_ids(&pnp);
1859 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1860 void *not_used, void **return_value)
1862 struct acpi_device *device = NULL;
1864 unsigned long long sta;
1867 acpi_bus_get_device(handle, &device);
1871 result = acpi_bus_type_and_status(handle, &type, &sta);
1875 if (type == ACPI_BUS_TYPE_POWER) {
1876 acpi_add_power_resource(handle);
1880 acpi_scan_init_hotplug(handle, type);
1882 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1883 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1884 struct acpi_device_wakeup wakeup;
1886 if (acpi_has_method(handle, "_PRW")) {
1887 acpi_bus_extract_wakeup_device_power_package(handle,
1889 acpi_power_resources_list_free(&wakeup.resources);
1891 return AE_CTRL_DEPTH;
1894 acpi_add_single_object(&device, handle, type, sta);
1896 return AE_CTRL_DEPTH;
1900 *return_value = device;
1905 static int acpi_scan_attach_handler(struct acpi_device *device)
1907 struct acpi_hardware_id *hwid;
1910 list_for_each_entry(hwid, &device->pnp.ids, list) {
1911 const struct acpi_device_id *devid;
1912 struct acpi_scan_handler *handler;
1914 handler = acpi_scan_match_handler(hwid->id, &devid);
1916 ret = handler->attach(device, devid);
1918 device->handler = handler;
1920 } else if (ret < 0) {
1928 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1929 void *not_used, void **ret_not_used)
1931 struct acpi_device *device;
1932 unsigned long long sta_not_used;
1936 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1937 * namespace walks prematurely.
1939 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1942 if (acpi_bus_get_device(handle, &device))
1943 return AE_CTRL_DEPTH;
1945 ret = acpi_scan_attach_handler(device);
1947 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1949 ret = device_attach(&device->dev);
1950 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1954 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1955 * @handle: Root of the namespace scope to scan.
1957 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1960 * If no devices were found, -ENODEV is returned, but it does not mean that
1961 * there has been a real error. There just have been no suitable ACPI objects
1962 * in the table trunk from which the kernel could create a device and add an
1963 * appropriate driver.
1965 * Must be called under acpi_scan_lock.
1967 int acpi_bus_scan(acpi_handle handle)
1969 void *device = NULL;
1972 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1973 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1974 acpi_bus_check_add, NULL, NULL, &device);
1978 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1979 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1980 acpi_bus_device_attach, NULL, NULL, NULL);
1984 EXPORT_SYMBOL(acpi_bus_scan);
1986 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1987 void *not_used, void **ret_not_used)
1989 struct acpi_device *device = NULL;
1991 if (!acpi_bus_get_device(handle, &device)) {
1992 struct acpi_scan_handler *dev_handler = device->handler;
1995 if (dev_handler->detach)
1996 dev_handler->detach(device);
1998 device->handler = NULL;
2000 device_release_driver(&device->dev);
2006 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
2007 void *not_used, void **ret_not_used)
2009 struct acpi_device *device = NULL;
2011 if (!acpi_bus_get_device(handle, &device))
2012 acpi_device_unregister(device);
2018 * acpi_bus_trim - Remove ACPI device node and all of its descendants
2019 * @start: Root of the ACPI device nodes subtree to remove.
2021 * Must be called under acpi_scan_lock.
2023 void acpi_bus_trim(struct acpi_device *start)
2026 * Execute acpi_bus_device_detach() as a post-order callback to detach
2027 * all ACPI drivers from the device nodes being removed.
2029 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2030 acpi_bus_device_detach, NULL, NULL);
2031 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2033 * Execute acpi_bus_remove() as a post-order callback to remove device
2034 * nodes in the given namespace scope.
2036 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2037 acpi_bus_remove, NULL, NULL);
2038 acpi_bus_remove(start->handle, 0, NULL, NULL);
2040 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2042 static int acpi_bus_scan_fixed(void)
2047 * Enumerate all fixed-feature devices.
2049 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2050 struct acpi_device *device = NULL;
2052 result = acpi_add_single_object(&device, NULL,
2053 ACPI_BUS_TYPE_POWER_BUTTON,
2058 result = device_attach(&device->dev);
2062 device_init_wakeup(&device->dev, true);
2065 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2066 struct acpi_device *device = NULL;
2068 result = acpi_add_single_object(&device, NULL,
2069 ACPI_BUS_TYPE_SLEEP_BUTTON,
2074 result = device_attach(&device->dev);
2077 return result < 0 ? result : 0;
2080 int __init acpi_scan_init(void)
2084 result = bus_register(&acpi_bus_type);
2086 /* We don't want to quit even if we failed to add suspend/resume */
2087 printk(KERN_ERR PREFIX "Could not register bus type\n");
2090 acpi_pci_root_init();
2091 acpi_pci_link_init();
2092 acpi_processor_init();
2093 acpi_platform_init();
2095 acpi_cmos_rtc_init();
2096 acpi_container_init();
2097 acpi_memory_hotplug_init();
2100 mutex_lock(&acpi_scan_lock);
2102 * Enumerate devices in the ACPI namespace.
2104 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2108 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2112 result = acpi_bus_scan_fixed();
2114 acpi_device_unregister(acpi_root);
2118 acpi_update_all_gpes();
2120 acpi_pci_root_hp_init();
2123 mutex_unlock(&acpi_scan_lock);