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)
30 static const char *dummy_hid = "device";
32 static LIST_HEAD(acpi_device_list);
33 static LIST_HEAD(acpi_bus_id_list);
34 static DEFINE_MUTEX(acpi_scan_lock);
35 static LIST_HEAD(acpi_scan_handlers_list);
36 DEFINE_MUTEX(acpi_device_lock);
37 LIST_HEAD(acpi_wakeup_device_list);
39 struct acpi_device_bus_id{
41 unsigned int instance_no;
42 struct list_head node;
45 void acpi_scan_lock_acquire(void)
47 mutex_lock(&acpi_scan_lock);
49 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
51 void acpi_scan_lock_release(void)
53 mutex_unlock(&acpi_scan_lock);
55 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
57 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
59 if (!handler || !handler->attach)
62 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
66 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
67 const char *hotplug_profile_name)
71 error = acpi_scan_add_handler(handler);
75 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
80 * Creates hid/cid(s) string needed for modalias and uevent
81 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
82 * char *modalias: "acpi:IBM0001:ACPI0001"
84 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
89 struct acpi_hardware_id *id;
91 if (list_empty(&acpi_dev->pnp.ids))
94 len = snprintf(modalias, size, "acpi:");
97 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
98 count = snprintf(&modalias[len], size, "%s:", id->id);
99 if (count < 0 || count >= size)
105 modalias[len] = '\0';
110 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
111 struct acpi_device *acpi_dev = to_acpi_device(dev);
114 /* Device has no HID and no CID or string is >1024 */
115 len = create_modalias(acpi_dev, buf, 1024);
121 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
123 static int acpi_scan_hot_remove(struct acpi_device *device)
125 acpi_handle handle = device->handle;
126 acpi_handle not_used;
127 struct acpi_object_list arg_list;
128 union acpi_object arg;
130 unsigned long long sta;
132 /* If there is no handle, the device node has been unregistered. */
134 dev_dbg(&device->dev, "ACPI handle missing\n");
135 put_device(&device->dev);
139 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
140 "Hot-removing device %s...\n", dev_name(&device->dev)));
142 acpi_bus_trim(device);
143 /* Device node has been unregistered. */
144 put_device(&device->dev);
147 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", ¬_used))) {
149 arg_list.pointer = &arg;
150 arg.type = ACPI_TYPE_INTEGER;
151 arg.integer.value = 0;
152 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
156 arg_list.pointer = &arg;
157 arg.type = ACPI_TYPE_INTEGER;
158 arg.integer.value = 1;
163 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
164 if (ACPI_FAILURE(status)) {
165 if (status == AE_NOT_FOUND) {
168 acpi_handle_warn(handle, "Eject failed (0x%x)\n",
175 * Verify if eject was indeed successful. If not, log an error
176 * message. No need to call _OST since _EJ0 call was made OK.
178 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
179 if (ACPI_FAILURE(status)) {
180 acpi_handle_warn(handle,
181 "Status check after eject failed (0x%x)\n", status);
182 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
183 acpi_handle_warn(handle,
184 "Eject incomplete - status 0x%llx\n", sta);
190 static void acpi_bus_device_eject(void *context)
192 acpi_handle handle = context;
193 struct acpi_device *device = NULL;
194 struct acpi_scan_handler *handler;
195 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
197 mutex_lock(&acpi_scan_lock);
199 acpi_bus_get_device(handle, &device);
203 handler = device->handler;
204 if (!handler || !handler->hotplug.enabled) {
205 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
208 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
209 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
210 if (handler->hotplug.mode == AHM_CONTAINER) {
211 device->flags.eject_pending = true;
212 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
216 get_device(&device->dev);
217 error = acpi_scan_hot_remove(device);
223 mutex_unlock(&acpi_scan_lock);
227 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
232 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
234 struct acpi_device *device = NULL;
235 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
238 mutex_lock(&acpi_scan_lock);
240 if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
241 acpi_bus_get_device(handle, &device);
243 dev_warn(&device->dev, "Attempt to re-insert\n");
247 acpi_evaluate_hotplug_ost(handle, ost_source,
248 ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
249 error = acpi_bus_scan(handle);
251 acpi_handle_warn(handle, "Namespace scan failure\n");
254 error = acpi_bus_get_device(handle, &device);
256 acpi_handle_warn(handle, "Missing device node object\n");
259 ost_code = ACPI_OST_SC_SUCCESS;
260 if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
261 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
264 acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
265 mutex_unlock(&acpi_scan_lock);
268 static void acpi_scan_bus_check(void *context)
270 acpi_scan_bus_device_check((acpi_handle)context,
271 ACPI_NOTIFY_BUS_CHECK);
274 static void acpi_scan_device_check(void *context)
276 acpi_scan_bus_device_check((acpi_handle)context,
277 ACPI_NOTIFY_DEVICE_CHECK);
280 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
285 case ACPI_NOTIFY_BUS_CHECK:
286 acpi_handle_debug(handle,
287 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
288 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
290 case ACPI_NOTIFY_DEVICE_CHECK:
291 acpi_handle_debug(handle,
292 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
293 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
295 case ACPI_NOTIFY_EJECT_REQUEST:
296 acpi_handle_debug(handle,
297 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
298 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
301 /* non-hotplug event; possibly handled by other handler */
305 acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
308 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
310 acpi_osd_exec_callback callback;
311 struct acpi_scan_handler *handler = data;
314 if (!handler->hotplug.enabled)
315 return acpi_hotplug_unsupported(handle, type);
318 case ACPI_NOTIFY_BUS_CHECK:
319 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
320 callback = acpi_scan_bus_check;
322 case ACPI_NOTIFY_DEVICE_CHECK:
323 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
324 callback = acpi_scan_device_check;
326 case ACPI_NOTIFY_EJECT_REQUEST:
327 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
328 callback = acpi_bus_device_eject;
331 /* non-hotplug event; possibly handled by other handler */
334 status = acpi_os_hotplug_execute(callback, handle);
335 if (ACPI_FAILURE(status))
336 acpi_evaluate_hotplug_ost(handle, type,
337 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
342 * acpi_bus_hot_remove_device: hot-remove a device and its children
343 * @context: struct acpi_eject_event pointer (freed in this func)
345 * Hot-remove a device and its children. This function frees up the
346 * memory space passed by arg context, so that the caller may call
347 * this function asynchronously through acpi_os_hotplug_execute().
349 void acpi_bus_hot_remove_device(void *context)
351 struct acpi_eject_event *ej_event = context;
352 struct acpi_device *device = ej_event->device;
353 acpi_handle handle = device->handle;
356 mutex_lock(&acpi_scan_lock);
358 error = acpi_scan_hot_remove(device);
360 acpi_evaluate_hotplug_ost(handle, ej_event->event,
361 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
364 mutex_unlock(&acpi_scan_lock);
367 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
369 static ssize_t real_power_state_show(struct device *dev,
370 struct device_attribute *attr, char *buf)
372 struct acpi_device *adev = to_acpi_device(dev);
376 ret = acpi_device_get_power(adev, &state);
380 return sprintf(buf, "%s\n", acpi_power_state_string(state));
383 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
385 static ssize_t power_state_show(struct device *dev,
386 struct device_attribute *attr, char *buf)
388 struct acpi_device *adev = to_acpi_device(dev);
390 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
393 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
396 acpi_eject_store(struct device *d, struct device_attribute *attr,
397 const char *buf, size_t count)
399 struct acpi_device *acpi_device = to_acpi_device(d);
400 struct acpi_eject_event *ej_event;
401 acpi_object_type not_used;
406 if (!count || buf[0] != '1')
409 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
410 && !acpi_device->driver)
413 status = acpi_get_type(acpi_device->handle, ¬_used);
414 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
417 mutex_lock(&acpi_scan_lock);
419 if (acpi_device->flags.eject_pending) {
420 /* ACPI eject notification event. */
421 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
422 acpi_device->flags.eject_pending = 0;
424 /* Eject initiated by user space. */
425 ost_source = ACPI_OST_EC_OSPM_EJECT;
427 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
432 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
433 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
434 ej_event->device = acpi_device;
435 ej_event->event = ost_source;
436 get_device(&acpi_device->dev);
437 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
438 if (ACPI_FAILURE(status)) {
439 put_device(&acpi_device->dev);
441 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
447 mutex_unlock(&acpi_scan_lock);
451 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
452 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
456 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
459 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
460 struct acpi_device *acpi_dev = to_acpi_device(dev);
462 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
464 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
466 static ssize_t acpi_device_uid_show(struct device *dev,
467 struct device_attribute *attr, char *buf)
469 struct acpi_device *acpi_dev = to_acpi_device(dev);
471 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
473 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
475 static ssize_t acpi_device_adr_show(struct device *dev,
476 struct device_attribute *attr, char *buf)
478 struct acpi_device *acpi_dev = to_acpi_device(dev);
480 return sprintf(buf, "0x%08x\n",
481 (unsigned int)(acpi_dev->pnp.bus_address));
483 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
486 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
487 struct acpi_device *acpi_dev = to_acpi_device(dev);
488 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
491 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
495 result = sprintf(buf, "%s\n", (char*)path.pointer);
500 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
502 /* sysfs file that shows description text from the ACPI _STR method */
503 static ssize_t description_show(struct device *dev,
504 struct device_attribute *attr,
506 struct acpi_device *acpi_dev = to_acpi_device(dev);
509 if (acpi_dev->pnp.str_obj == NULL)
513 * The _STR object contains a Unicode identifier for a device.
514 * We need to convert to utf-8 so it can be displayed.
516 result = utf16s_to_utf8s(
517 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
518 acpi_dev->pnp.str_obj->buffer.length,
519 UTF16_LITTLE_ENDIAN, buf,
522 buf[result++] = '\n';
526 static DEVICE_ATTR(description, 0444, description_show, NULL);
529 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
531 struct acpi_device *acpi_dev = to_acpi_device(dev);
533 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
535 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
537 static int acpi_device_setup_files(struct acpi_device *dev)
539 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
542 unsigned long long sun;
546 * Devices gotten from FADT don't have a "path" attribute
549 result = device_create_file(&dev->dev, &dev_attr_path);
554 if (!list_empty(&dev->pnp.ids)) {
555 result = device_create_file(&dev->dev, &dev_attr_hid);
559 result = device_create_file(&dev->dev, &dev_attr_modalias);
565 * If device has _STR, 'description' file is created
567 status = acpi_get_handle(dev->handle, "_STR", &temp);
568 if (ACPI_SUCCESS(status)) {
569 status = acpi_evaluate_object(dev->handle, "_STR",
571 if (ACPI_FAILURE(status))
572 buffer.pointer = NULL;
573 dev->pnp.str_obj = buffer.pointer;
574 result = device_create_file(&dev->dev, &dev_attr_description);
579 if (dev->pnp.type.bus_address)
580 result = device_create_file(&dev->dev, &dev_attr_adr);
581 if (dev->pnp.unique_id)
582 result = device_create_file(&dev->dev, &dev_attr_uid);
584 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
585 if (ACPI_SUCCESS(status)) {
586 dev->pnp.sun = (unsigned long)sun;
587 result = device_create_file(&dev->dev, &dev_attr_sun);
591 dev->pnp.sun = (unsigned long)-1;
595 * If device has _EJ0, 'eject' file is created that is used to trigger
596 * hot-removal function from userland.
598 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
599 if (ACPI_SUCCESS(status)) {
600 result = device_create_file(&dev->dev, &dev_attr_eject);
605 if (dev->flags.power_manageable) {
606 result = device_create_file(&dev->dev, &dev_attr_power_state);
610 if (dev->power.flags.power_resources)
611 result = device_create_file(&dev->dev,
612 &dev_attr_real_power_state);
619 static void acpi_device_remove_files(struct acpi_device *dev)
624 if (dev->flags.power_manageable) {
625 device_remove_file(&dev->dev, &dev_attr_power_state);
626 if (dev->power.flags.power_resources)
627 device_remove_file(&dev->dev,
628 &dev_attr_real_power_state);
632 * If device has _STR, remove 'description' file
634 status = acpi_get_handle(dev->handle, "_STR", &temp);
635 if (ACPI_SUCCESS(status)) {
636 kfree(dev->pnp.str_obj);
637 device_remove_file(&dev->dev, &dev_attr_description);
640 * If device has _EJ0, remove 'eject' file.
642 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
643 if (ACPI_SUCCESS(status))
644 device_remove_file(&dev->dev, &dev_attr_eject);
646 status = acpi_get_handle(dev->handle, "_SUN", &temp);
647 if (ACPI_SUCCESS(status))
648 device_remove_file(&dev->dev, &dev_attr_sun);
650 if (dev->pnp.unique_id)
651 device_remove_file(&dev->dev, &dev_attr_uid);
652 if (dev->pnp.type.bus_address)
653 device_remove_file(&dev->dev, &dev_attr_adr);
654 device_remove_file(&dev->dev, &dev_attr_modalias);
655 device_remove_file(&dev->dev, &dev_attr_hid);
657 device_remove_file(&dev->dev, &dev_attr_path);
659 /* --------------------------------------------------------------------------
661 -------------------------------------------------------------------------- */
663 static const struct acpi_device_id *__acpi_match_device(
664 struct acpi_device *device, const struct acpi_device_id *ids)
666 const struct acpi_device_id *id;
667 struct acpi_hardware_id *hwid;
670 * If the device is not present, it is unnecessary to load device
673 if (!device->status.present)
676 for (id = ids; id->id[0]; id++)
677 list_for_each_entry(hwid, &device->pnp.ids, list)
678 if (!strcmp((char *) id->id, hwid->id))
685 * acpi_match_device - Match a struct device against a given list of ACPI IDs
686 * @ids: Array of struct acpi_device_id object to match against.
687 * @dev: The device structure to match.
689 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
690 * object for that handle and use that object to match against a given list of
693 * Return a pointer to the first matching ID on success or %NULL on failure.
695 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
696 const struct device *dev)
698 struct acpi_device *adev;
699 acpi_handle handle = ACPI_HANDLE(dev);
701 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
704 return __acpi_match_device(adev, ids);
706 EXPORT_SYMBOL_GPL(acpi_match_device);
708 int acpi_match_device_ids(struct acpi_device *device,
709 const struct acpi_device_id *ids)
711 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
713 EXPORT_SYMBOL(acpi_match_device_ids);
715 static void acpi_free_power_resources_lists(struct acpi_device *device)
719 if (device->wakeup.flags.valid)
720 acpi_power_resources_list_free(&device->wakeup.resources);
722 if (!device->flags.power_manageable)
725 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
726 struct acpi_device_power_state *ps = &device->power.states[i];
727 acpi_power_resources_list_free(&ps->resources);
731 static void acpi_device_release(struct device *dev)
733 struct acpi_device *acpi_dev = to_acpi_device(dev);
735 acpi_free_pnp_ids(&acpi_dev->pnp);
736 acpi_free_power_resources_lists(acpi_dev);
740 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
742 struct acpi_device *acpi_dev = to_acpi_device(dev);
743 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
745 return acpi_dev->flags.match_driver
746 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
749 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
751 struct acpi_device *acpi_dev = to_acpi_device(dev);
754 if (list_empty(&acpi_dev->pnp.ids))
757 if (add_uevent_var(env, "MODALIAS="))
759 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
760 sizeof(env->buf) - env->buflen);
761 if (len >= (sizeof(env->buf) - env->buflen))
767 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
769 struct acpi_device *device = data;
771 device->driver->ops.notify(device, event);
774 static acpi_status acpi_device_notify_fixed(void *data)
776 struct acpi_device *device = data;
778 /* Fixed hardware devices have no handles */
779 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
783 static int acpi_device_install_notify_handler(struct acpi_device *device)
787 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
789 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
790 acpi_device_notify_fixed,
792 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
794 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
795 acpi_device_notify_fixed,
798 status = acpi_install_notify_handler(device->handle,
803 if (ACPI_FAILURE(status))
808 static void acpi_device_remove_notify_handler(struct acpi_device *device)
810 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
811 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
812 acpi_device_notify_fixed);
813 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
814 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
815 acpi_device_notify_fixed);
817 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
821 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
822 static int acpi_device_probe(struct device * dev)
824 struct acpi_device *acpi_dev = to_acpi_device(dev);
825 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
828 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
830 if (acpi_drv->ops.notify) {
831 ret = acpi_device_install_notify_handler(acpi_dev);
833 if (acpi_drv->ops.remove)
834 acpi_drv->ops.remove(acpi_dev);
835 acpi_dev->driver = NULL;
836 acpi_dev->driver_data = NULL;
841 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
842 "Found driver [%s] for device [%s]\n",
843 acpi_drv->name, acpi_dev->pnp.bus_id));
849 static int acpi_device_remove(struct device * dev)
851 struct acpi_device *acpi_dev = to_acpi_device(dev);
852 struct acpi_driver *acpi_drv = acpi_dev->driver;
855 if (acpi_drv->ops.notify)
856 acpi_device_remove_notify_handler(acpi_dev);
857 if (acpi_drv->ops.remove)
858 acpi_drv->ops.remove(acpi_dev);
860 acpi_dev->driver = NULL;
861 acpi_dev->driver_data = NULL;
867 struct bus_type acpi_bus_type = {
869 .match = acpi_bus_match,
870 .probe = acpi_device_probe,
871 .remove = acpi_device_remove,
872 .uevent = acpi_device_uevent,
875 int acpi_device_add(struct acpi_device *device,
876 void (*release)(struct device *))
879 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
882 if (device->handle) {
885 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
887 if (ACPI_FAILURE(status)) {
888 acpi_handle_err(device->handle,
889 "Unable to attach device data\n");
897 * Link this device to its parent and siblings.
899 INIT_LIST_HEAD(&device->children);
900 INIT_LIST_HEAD(&device->node);
901 INIT_LIST_HEAD(&device->wakeup_list);
902 INIT_LIST_HEAD(&device->physical_node_list);
903 mutex_init(&device->physical_node_lock);
904 INIT_LIST_HEAD(&device->power_dependent);
906 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
908 pr_err(PREFIX "Memory allocation error\n");
913 mutex_lock(&acpi_device_lock);
915 * Find suitable bus_id and instance number in acpi_bus_id_list
916 * If failed, create one and link it into acpi_bus_id_list
918 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
919 if (!strcmp(acpi_device_bus_id->bus_id,
920 acpi_device_hid(device))) {
921 acpi_device_bus_id->instance_no++;
928 acpi_device_bus_id = new_bus_id;
929 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
930 acpi_device_bus_id->instance_no = 0;
931 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
933 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
936 list_add_tail(&device->node, &device->parent->children);
938 if (device->wakeup.flags.valid)
939 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
940 mutex_unlock(&acpi_device_lock);
943 device->dev.parent = &device->parent->dev;
944 device->dev.bus = &acpi_bus_type;
945 device->dev.release = release;
946 result = device_add(&device->dev);
948 dev_err(&device->dev, "Error registering device\n");
952 result = acpi_device_setup_files(device);
954 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
955 dev_name(&device->dev));
957 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
961 mutex_lock(&acpi_device_lock);
963 list_del(&device->node);
964 list_del(&device->wakeup_list);
965 mutex_unlock(&acpi_device_lock);
968 acpi_detach_data(device->handle, acpi_bus_data_handler);
972 static void acpi_device_unregister(struct acpi_device *device)
974 mutex_lock(&acpi_device_lock);
976 list_del(&device->node);
978 list_del(&device->wakeup_list);
979 mutex_unlock(&acpi_device_lock);
981 acpi_detach_data(device->handle, acpi_bus_data_handler);
983 acpi_power_add_remove_device(device, false);
984 acpi_device_remove_files(device);
986 device->remove(device);
988 device_del(&device->dev);
990 * Transition the device to D3cold to drop the reference counts of all
991 * power resources the device depends on and turn off the ones that have
992 * no more references.
994 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
995 device->handle = NULL;
996 put_device(&device->dev);
999 /* --------------------------------------------------------------------------
1001 -------------------------------------------------------------------------- */
1003 * acpi_bus_driver_init - add a device to a driver
1004 * @device: the device to add and initialize
1005 * @driver: driver for the device
1007 * Used to initialize a device via its device driver. Called whenever a
1008 * driver is bound to a device. Invokes the driver's add() ops.
1011 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
1015 if (!device || !driver)
1018 if (!driver->ops.add)
1021 result = driver->ops.add(device);
1025 device->driver = driver;
1028 * TBD - Configuration Management: Assign resources to device based
1029 * upon possible configuration and currently allocated resources.
1032 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1033 "Driver successfully bound to device\n"));
1038 * acpi_bus_register_driver - register a driver with the ACPI bus
1039 * @driver: driver being registered
1041 * Registers a driver with the ACPI bus. Searches the namespace for all
1042 * devices that match the driver's criteria and binds. Returns zero for
1043 * success or a negative error status for failure.
1045 int acpi_bus_register_driver(struct acpi_driver *driver)
1051 driver->drv.name = driver->name;
1052 driver->drv.bus = &acpi_bus_type;
1053 driver->drv.owner = driver->owner;
1055 ret = driver_register(&driver->drv);
1059 EXPORT_SYMBOL(acpi_bus_register_driver);
1062 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1063 * @driver: driver to unregister
1065 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1066 * devices that match the driver's criteria and unbinds.
1068 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1070 driver_unregister(&driver->drv);
1073 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1075 /* --------------------------------------------------------------------------
1077 -------------------------------------------------------------------------- */
1078 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1080 struct acpi_device *device = NULL;
1084 * Fixed hardware devices do not appear in the namespace and do not
1085 * have handles, but we fabricate acpi_devices for them, so we have
1086 * to deal with them specially.
1092 status = acpi_get_parent(handle, &handle);
1093 if (ACPI_FAILURE(status))
1094 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1095 } while (acpi_bus_get_device(handle, &device));
1100 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1104 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1105 union acpi_object *obj;
1107 status = acpi_get_handle(handle, "_EJD", &tmp);
1108 if (ACPI_FAILURE(status))
1111 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1112 if (ACPI_SUCCESS(status)) {
1113 obj = buffer.pointer;
1114 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1116 kfree(buffer.pointer);
1120 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1122 void acpi_bus_data_handler(acpi_handle handle, void *context)
1130 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1131 struct acpi_device_wakeup *wakeup)
1133 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1134 union acpi_object *package = NULL;
1135 union acpi_object *element = NULL;
1142 INIT_LIST_HEAD(&wakeup->resources);
1145 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1146 if (ACPI_FAILURE(status)) {
1147 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1151 package = (union acpi_object *)buffer.pointer;
1153 if (!package || package->package.count < 2)
1156 element = &(package->package.elements[0]);
1160 if (element->type == ACPI_TYPE_PACKAGE) {
1161 if ((element->package.count < 2) ||
1162 (element->package.elements[0].type !=
1163 ACPI_TYPE_LOCAL_REFERENCE)
1164 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1167 wakeup->gpe_device =
1168 element->package.elements[0].reference.handle;
1169 wakeup->gpe_number =
1170 (u32) element->package.elements[1].integer.value;
1171 } else if (element->type == ACPI_TYPE_INTEGER) {
1172 wakeup->gpe_device = NULL;
1173 wakeup->gpe_number = element->integer.value;
1178 element = &(package->package.elements[1]);
1179 if (element->type != ACPI_TYPE_INTEGER)
1182 wakeup->sleep_state = element->integer.value;
1184 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1188 if (!list_empty(&wakeup->resources)) {
1191 err = acpi_power_wakeup_list_init(&wakeup->resources,
1194 acpi_handle_warn(handle, "Retrieving current states "
1195 "of wakeup power resources failed\n");
1196 acpi_power_resources_list_free(&wakeup->resources);
1199 if (sleep_state < wakeup->sleep_state) {
1200 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1201 "(S%d) by S%d from power resources\n",
1202 (int)wakeup->sleep_state, sleep_state);
1203 wakeup->sleep_state = sleep_state;
1206 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1209 kfree(buffer.pointer);
1213 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1215 struct acpi_device_id button_device_ids[] = {
1222 acpi_event_status event_status;
1224 device->wakeup.flags.notifier_present = 0;
1226 /* Power button, Lid switch always enable wakeup */
1227 if (!acpi_match_device_ids(device, button_device_ids)) {
1228 device->wakeup.flags.run_wake = 1;
1229 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1230 /* Do not use Lid/sleep button for S5 wakeup */
1231 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1232 device->wakeup.sleep_state = ACPI_STATE_S4;
1234 device_set_wakeup_capable(&device->dev, true);
1238 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1239 device->wakeup.gpe_number,
1241 if (status == AE_OK)
1242 device->wakeup.flags.run_wake =
1243 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1246 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1249 acpi_status status = 0;
1252 /* Presence of _PRW indicates wake capable */
1253 status = acpi_get_handle(device->handle, "_PRW", &temp);
1254 if (ACPI_FAILURE(status))
1257 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1260 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1264 device->wakeup.flags.valid = 1;
1265 device->wakeup.prepare_count = 0;
1266 acpi_bus_set_run_wake_flags(device);
1267 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1268 * system for the ACPI device with the _PRW object.
1269 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1270 * So it is necessary to call _DSW object first. Only when it is not
1271 * present will the _PSW object used.
1273 err = acpi_device_sleep_wake(device, 0, 0, 0);
1275 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1276 "error in _DSW or _PSW evaluation\n"));
1279 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1281 struct acpi_device_power_state *ps = &device->power.states[state];
1282 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1283 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1287 INIT_LIST_HEAD(&ps->resources);
1289 /* Evaluate "_PRx" to get referenced power resources */
1290 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1291 if (ACPI_SUCCESS(status)) {
1292 union acpi_object *package = buffer.pointer;
1294 if (buffer.length && package
1295 && package->type == ACPI_TYPE_PACKAGE
1296 && package->package.count) {
1297 int err = acpi_extract_power_resources(package, 0,
1300 device->power.flags.power_resources = 1;
1302 ACPI_FREE(buffer.pointer);
1305 /* Evaluate "_PSx" to see if we can do explicit sets */
1307 status = acpi_get_handle(device->handle, pathname, &handle);
1308 if (ACPI_SUCCESS(status))
1309 ps->flags.explicit_set = 1;
1312 * State is valid if there are means to put the device into it.
1313 * D3hot is only valid if _PR3 present.
1315 if (!list_empty(&ps->resources)
1316 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1317 ps->flags.valid = 1;
1318 ps->flags.os_accessible = 1;
1321 ps->power = -1; /* Unknown - driver assigned */
1322 ps->latency = -1; /* Unknown - driver assigned */
1325 static void acpi_bus_get_power_flags(struct acpi_device *device)
1331 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1332 status = acpi_get_handle(device->handle, "_PS0", &handle);
1333 if (ACPI_FAILURE(status)) {
1334 status = acpi_get_handle(device->handle, "_PR0", &handle);
1335 if (ACPI_FAILURE(status))
1339 device->flags.power_manageable = 1;
1342 * Power Management Flags
1344 status = acpi_get_handle(device->handle, "_PSC", &handle);
1345 if (ACPI_SUCCESS(status))
1346 device->power.flags.explicit_get = 1;
1347 status = acpi_get_handle(device->handle, "_IRC", &handle);
1348 if (ACPI_SUCCESS(status))
1349 device->power.flags.inrush_current = 1;
1352 * Enumerate supported power management states
1354 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1355 acpi_bus_init_power_state(device, i);
1357 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1359 /* Set defaults for D0 and D3 states (always valid) */
1360 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1361 device->power.states[ACPI_STATE_D0].power = 100;
1362 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1363 device->power.states[ACPI_STATE_D3].power = 0;
1365 /* Set D3cold's explicit_set flag if _PS3 exists. */
1366 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1367 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1369 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1370 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1371 device->power.flags.power_resources)
1372 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1374 if (acpi_bus_init_power(device)) {
1375 acpi_free_power_resources_lists(device);
1376 device->flags.power_manageable = 0;
1380 static void acpi_bus_get_flags(struct acpi_device *device)
1382 acpi_status status = AE_OK;
1383 acpi_handle temp = NULL;
1385 /* Presence of _STA indicates 'dynamic_status' */
1386 status = acpi_get_handle(device->handle, "_STA", &temp);
1387 if (ACPI_SUCCESS(status))
1388 device->flags.dynamic_status = 1;
1390 /* Presence of _RMV indicates 'removable' */
1391 status = acpi_get_handle(device->handle, "_RMV", &temp);
1392 if (ACPI_SUCCESS(status))
1393 device->flags.removable = 1;
1395 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1396 status = acpi_get_handle(device->handle, "_EJD", &temp);
1397 if (ACPI_SUCCESS(status))
1398 device->flags.ejectable = 1;
1400 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1401 if (ACPI_SUCCESS(status))
1402 device->flags.ejectable = 1;
1406 static void acpi_device_get_busid(struct acpi_device *device)
1408 char bus_id[5] = { '?', 0 };
1409 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1415 * The device's Bus ID is simply the object name.
1416 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1418 if (ACPI_IS_ROOT_DEVICE(device)) {
1419 strcpy(device->pnp.bus_id, "ACPI");
1423 switch (device->device_type) {
1424 case ACPI_BUS_TYPE_POWER_BUTTON:
1425 strcpy(device->pnp.bus_id, "PWRF");
1427 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1428 strcpy(device->pnp.bus_id, "SLPF");
1431 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1432 /* Clean up trailing underscores (if any) */
1433 for (i = 3; i > 1; i--) {
1434 if (bus_id[i] == '_')
1439 strcpy(device->pnp.bus_id, bus_id);
1445 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1447 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1448 * then we can safely call it an ejectable drive bay
1450 static int acpi_bay_match(acpi_handle handle)
1454 acpi_handle phandle;
1456 status = acpi_get_handle(handle, "_EJ0", &tmp);
1457 if (ACPI_FAILURE(status))
1460 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1461 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1462 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1463 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1466 if (acpi_get_parent(handle, &phandle))
1469 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1470 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1471 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1472 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1479 * acpi_dock_match - see if an acpi object has a _DCK method
1481 static int acpi_dock_match(acpi_handle handle)
1484 return acpi_get_handle(handle, "_DCK", &tmp);
1487 const char *acpi_device_hid(struct acpi_device *device)
1489 struct acpi_hardware_id *hid;
1491 if (list_empty(&device->pnp.ids))
1494 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1497 EXPORT_SYMBOL(acpi_device_hid);
1499 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1501 struct acpi_hardware_id *id;
1503 id = kmalloc(sizeof(*id), GFP_KERNEL);
1507 id->id = kstrdup(dev_id, GFP_KERNEL);
1513 list_add_tail(&id->list, &pnp->ids);
1514 pnp->type.hardware_id = 1;
1518 * Old IBM workstations have a DSDT bug wherein the SMBus object
1519 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1520 * prefix. Work around this.
1522 static int acpi_ibm_smbus_match(acpi_handle handle)
1524 acpi_handle h_dummy;
1525 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1528 if (!dmi_name_in_vendors("IBM"))
1531 /* Look for SMBS object */
1532 result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1536 if (strcmp("SMBS", path.pointer)) {
1541 /* Does it have the necessary (but misnamed) methods? */
1543 if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1544 ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1545 ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1548 kfree(path.pointer);
1552 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1556 struct acpi_device_info *info;
1557 struct acpi_pnp_device_id_list *cid_list;
1560 switch (device_type) {
1561 case ACPI_BUS_TYPE_DEVICE:
1562 if (handle == ACPI_ROOT_OBJECT) {
1563 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1567 status = acpi_get_object_info(handle, &info);
1568 if (ACPI_FAILURE(status)) {
1569 pr_err(PREFIX "%s: Error reading device info\n",
1574 if (info->valid & ACPI_VALID_HID)
1575 acpi_add_id(pnp, info->hardware_id.string);
1576 if (info->valid & ACPI_VALID_CID) {
1577 cid_list = &info->compatible_id_list;
1578 for (i = 0; i < cid_list->count; i++)
1579 acpi_add_id(pnp, cid_list->ids[i].string);
1581 if (info->valid & ACPI_VALID_ADR) {
1582 pnp->bus_address = info->address;
1583 pnp->type.bus_address = 1;
1585 if (info->valid & ACPI_VALID_UID)
1586 pnp->unique_id = kstrdup(info->unique_id.string,
1592 * Some devices don't reliably have _HIDs & _CIDs, so add
1593 * synthetic HIDs to make sure drivers can find them.
1595 if (acpi_is_video_device(handle))
1596 acpi_add_id(pnp, ACPI_VIDEO_HID);
1597 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1598 acpi_add_id(pnp, ACPI_BAY_HID);
1599 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1600 acpi_add_id(pnp, ACPI_DOCK_HID);
1601 else if (!acpi_ibm_smbus_match(handle))
1602 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1603 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1604 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1605 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1606 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1610 case ACPI_BUS_TYPE_POWER:
1611 acpi_add_id(pnp, ACPI_POWER_HID);
1613 case ACPI_BUS_TYPE_PROCESSOR:
1614 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1616 case ACPI_BUS_TYPE_THERMAL:
1617 acpi_add_id(pnp, ACPI_THERMAL_HID);
1619 case ACPI_BUS_TYPE_POWER_BUTTON:
1620 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1622 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1623 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1628 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1630 struct acpi_hardware_id *id, *tmp;
1632 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1636 kfree(pnp->unique_id);
1639 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1640 int type, unsigned long long sta)
1642 INIT_LIST_HEAD(&device->pnp.ids);
1643 device->device_type = type;
1644 device->handle = handle;
1645 device->parent = acpi_bus_get_parent(handle);
1646 STRUCT_TO_INT(device->status) = sta;
1647 acpi_device_get_busid(device);
1648 acpi_set_pnp_ids(handle, &device->pnp, type);
1649 acpi_bus_get_flags(device);
1650 device->flags.match_driver = false;
1651 device_initialize(&device->dev);
1652 dev_set_uevent_suppress(&device->dev, true);
1655 void acpi_device_add_finalize(struct acpi_device *device)
1657 device->flags.match_driver = true;
1658 dev_set_uevent_suppress(&device->dev, false);
1659 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1662 static int acpi_add_single_object(struct acpi_device **child,
1663 acpi_handle handle, int type,
1664 unsigned long long sta)
1667 struct acpi_device *device;
1668 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1670 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1672 printk(KERN_ERR PREFIX "Memory allocation error\n");
1676 acpi_init_device_object(device, handle, type, sta);
1677 acpi_bus_get_power_flags(device);
1678 acpi_bus_get_wakeup_device_flags(device);
1680 result = acpi_device_add(device, acpi_device_release);
1682 acpi_device_release(&device->dev);
1686 acpi_power_add_remove_device(device, true);
1687 acpi_device_add_finalize(device);
1688 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1689 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1690 dev_name(&device->dev), (char *) buffer.pointer,
1691 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1692 kfree(buffer.pointer);
1697 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1698 unsigned long long *sta)
1701 acpi_object_type acpi_type;
1703 status = acpi_get_type(handle, &acpi_type);
1704 if (ACPI_FAILURE(status))
1707 switch (acpi_type) {
1708 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1709 case ACPI_TYPE_DEVICE:
1710 *type = ACPI_BUS_TYPE_DEVICE;
1711 status = acpi_bus_get_status_handle(handle, sta);
1712 if (ACPI_FAILURE(status))
1715 case ACPI_TYPE_PROCESSOR:
1716 *type = ACPI_BUS_TYPE_PROCESSOR;
1717 status = acpi_bus_get_status_handle(handle, sta);
1718 if (ACPI_FAILURE(status))
1721 case ACPI_TYPE_THERMAL:
1722 *type = ACPI_BUS_TYPE_THERMAL;
1723 *sta = ACPI_STA_DEFAULT;
1725 case ACPI_TYPE_POWER:
1726 *type = ACPI_BUS_TYPE_POWER;
1727 *sta = ACPI_STA_DEFAULT;
1736 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1738 const struct acpi_device_id **matchid)
1740 const struct acpi_device_id *devid;
1742 for (devid = handler->ids; devid->id[0]; devid++)
1743 if (!strcmp((char *)devid->id, idstr)) {
1753 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1754 const struct acpi_device_id **matchid)
1756 struct acpi_scan_handler *handler;
1758 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1759 if (acpi_scan_handler_matching(handler, idstr, matchid))
1765 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1767 if (!!hotplug->enabled == !!val)
1770 mutex_lock(&acpi_scan_lock);
1772 hotplug->enabled = val;
1774 mutex_unlock(&acpi_scan_lock);
1777 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1779 struct acpi_device_pnp pnp = {};
1780 struct acpi_hardware_id *hwid;
1781 struct acpi_scan_handler *handler;
1783 INIT_LIST_HEAD(&pnp.ids);
1784 acpi_set_pnp_ids(handle, &pnp, type);
1786 if (!pnp.type.hardware_id)
1790 * This relies on the fact that acpi_install_notify_handler() will not
1791 * install the same notify handler routine twice for the same handle.
1793 list_for_each_entry(hwid, &pnp.ids, list) {
1794 handler = acpi_scan_match_handler(hwid->id, NULL);
1796 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1797 acpi_hotplug_notify_cb, handler);
1803 acpi_free_pnp_ids(&pnp);
1806 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1807 void *not_used, void **return_value)
1809 struct acpi_device *device = NULL;
1811 unsigned long long sta;
1815 acpi_bus_get_device(handle, &device);
1819 result = acpi_bus_type_and_status(handle, &type, &sta);
1823 if (type == ACPI_BUS_TYPE_POWER) {
1824 acpi_add_power_resource(handle);
1828 acpi_scan_init_hotplug(handle, type);
1830 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1831 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1832 struct acpi_device_wakeup wakeup;
1835 status = acpi_get_handle(handle, "_PRW", &temp);
1836 if (ACPI_SUCCESS(status)) {
1837 acpi_bus_extract_wakeup_device_power_package(handle,
1839 acpi_power_resources_list_free(&wakeup.resources);
1841 return AE_CTRL_DEPTH;
1844 acpi_add_single_object(&device, handle, type, sta);
1846 return AE_CTRL_DEPTH;
1850 *return_value = device;
1855 static int acpi_scan_attach_handler(struct acpi_device *device)
1857 struct acpi_hardware_id *hwid;
1860 list_for_each_entry(hwid, &device->pnp.ids, list) {
1861 const struct acpi_device_id *devid;
1862 struct acpi_scan_handler *handler;
1864 handler = acpi_scan_match_handler(hwid->id, &devid);
1866 ret = handler->attach(device, devid);
1868 device->handler = handler;
1870 } else if (ret < 0) {
1878 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1879 void *not_used, void **ret_not_used)
1881 struct acpi_device *device;
1882 unsigned long long sta_not_used;
1886 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1887 * namespace walks prematurely.
1889 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1892 if (acpi_bus_get_device(handle, &device))
1893 return AE_CTRL_DEPTH;
1895 if (device->handler)
1898 ret = acpi_scan_attach_handler(device);
1900 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1902 ret = device_attach(&device->dev);
1903 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1907 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1908 * @handle: Root of the namespace scope to scan.
1910 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1913 * If no devices were found, -ENODEV is returned, but it does not mean that
1914 * there has been a real error. There just have been no suitable ACPI objects
1915 * in the table trunk from which the kernel could create a device and add an
1916 * appropriate driver.
1918 * Must be called under acpi_scan_lock.
1920 int acpi_bus_scan(acpi_handle handle)
1922 void *device = NULL;
1925 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1926 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1927 acpi_bus_check_add, NULL, NULL, &device);
1931 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1932 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1933 acpi_bus_device_attach, NULL, NULL, NULL);
1937 EXPORT_SYMBOL(acpi_bus_scan);
1939 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1940 void *not_used, void **ret_not_used)
1942 struct acpi_device *device = NULL;
1944 if (!acpi_bus_get_device(handle, &device)) {
1945 struct acpi_scan_handler *dev_handler = device->handler;
1947 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1949 if (dev_handler->detach)
1950 dev_handler->detach(device);
1952 device->handler = NULL;
1954 device_release_driver(&device->dev);
1960 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1961 void *not_used, void **ret_not_used)
1963 struct acpi_device *device = NULL;
1965 if (!acpi_bus_get_device(handle, &device))
1966 acpi_device_unregister(device);
1972 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1973 * @start: Root of the ACPI device nodes subtree to remove.
1975 * Must be called under acpi_scan_lock.
1977 void acpi_bus_trim(struct acpi_device *start)
1980 * Execute acpi_bus_device_detach() as a post-order callback to detach
1981 * all ACPI drivers from the device nodes being removed.
1983 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1984 acpi_bus_device_detach, NULL, NULL);
1985 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1987 * Execute acpi_bus_remove() as a post-order callback to remove device
1988 * nodes in the given namespace scope.
1990 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1991 acpi_bus_remove, NULL, NULL);
1992 acpi_bus_remove(start->handle, 0, NULL, NULL);
1994 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1996 static int acpi_bus_scan_fixed(void)
2001 * Enumerate all fixed-feature devices.
2003 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2004 struct acpi_device *device = NULL;
2006 result = acpi_add_single_object(&device, NULL,
2007 ACPI_BUS_TYPE_POWER_BUTTON,
2012 result = device_attach(&device->dev);
2016 device_init_wakeup(&device->dev, true);
2019 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2020 struct acpi_device *device = NULL;
2022 result = acpi_add_single_object(&device, NULL,
2023 ACPI_BUS_TYPE_SLEEP_BUTTON,
2028 result = device_attach(&device->dev);
2031 return result < 0 ? result : 0;
2034 int __init acpi_scan_init(void)
2038 result = bus_register(&acpi_bus_type);
2040 /* We don't want to quit even if we failed to add suspend/resume */
2041 printk(KERN_ERR PREFIX "Could not register bus type\n");
2044 acpi_pci_root_init();
2045 acpi_pci_link_init();
2046 acpi_platform_init();
2048 acpi_cmos_rtc_init();
2049 acpi_container_init();
2050 acpi_memory_hotplug_init();
2053 mutex_lock(&acpi_scan_lock);
2055 * Enumerate devices in the ACPI namespace.
2057 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2061 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2065 result = acpi_bus_scan_fixed();
2067 acpi_device_unregister(acpi_root);
2071 acpi_update_all_gpes();
2073 acpi_pci_root_hp_init();
2076 mutex_unlock(&acpi_scan_lock);