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 DEFINE_MUTEX(acpi_device_lock);
35 LIST_HEAD(acpi_wakeup_device_list);
37 struct acpi_device_bus_id{
39 unsigned int instance_no;
40 struct list_head node;
44 * Creates hid/cid(s) string needed for modalias and uevent
45 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
46 * char *modalias: "acpi:IBM0001:ACPI0001"
48 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
53 struct acpi_hardware_id *id;
55 if (list_empty(&acpi_dev->pnp.ids))
58 len = snprintf(modalias, size, "acpi:");
61 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
62 count = snprintf(&modalias[len], size, "%s:", id->id);
63 if (count < 0 || count >= size)
74 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
75 struct acpi_device *acpi_dev = to_acpi_device(dev);
78 /* Device has no HID and no CID or string is >1024 */
79 len = create_modalias(acpi_dev, buf, 1024);
85 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
88 * acpi_bus_hot_remove_device: hot-remove a device and its children
89 * @context: struct acpi_eject_event pointer (freed in this func)
91 * Hot-remove a device and its children. This function frees up the
92 * memory space passed by arg context, so that the caller may call
93 * this function asynchronously through acpi_os_hotplug_execute().
95 void acpi_bus_hot_remove_device(void *context)
97 struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
98 struct acpi_device *device;
99 acpi_handle handle = ej_event->handle;
100 struct acpi_object_list arg_list;
101 union acpi_object arg;
102 acpi_status status = AE_OK;
103 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
105 if (acpi_bus_get_device(handle, &device))
111 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
112 "Hot-removing device %s...\n", dev_name(&device->dev)));
114 if (acpi_bus_trim(device, 1)) {
115 printk(KERN_ERR PREFIX
116 "Removing device failed\n");
120 /* power off device */
121 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
122 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
123 printk(KERN_WARNING PREFIX
124 "Power-off device failed\n");
126 if (device->flags.lockable) {
128 arg_list.pointer = &arg;
129 arg.type = ACPI_TYPE_INTEGER;
130 arg.integer.value = 0;
131 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
135 arg_list.pointer = &arg;
136 arg.type = ACPI_TYPE_INTEGER;
137 arg.integer.value = 1;
142 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
143 if (ACPI_FAILURE(status)) {
144 if (status != AE_NOT_FOUND)
145 printk(KERN_WARNING PREFIX
146 "Eject device failed\n");
154 /* Inform firmware the hot-remove operation has completed w/ error */
155 (void) acpi_evaluate_hotplug_ost(handle,
156 ej_event->event, ost_code, NULL);
162 acpi_eject_store(struct device *d, struct device_attribute *attr,
163 const char *buf, size_t count)
167 acpi_object_type type = 0;
168 struct acpi_device *acpi_device = to_acpi_device(d);
169 struct acpi_eject_event *ej_event;
171 if ((!count) || (buf[0] != '1')) {
175 if (acpi_device->driver == NULL) {
180 status = acpi_get_type(acpi_device->handle, &type);
181 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
186 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
192 ej_event->handle = acpi_device->handle;
193 if (acpi_device->flags.eject_pending) {
194 /* event originated from ACPI eject notification */
195 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
196 acpi_device->flags.eject_pending = 0;
198 /* event originated from user */
199 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
200 (void) acpi_evaluate_hotplug_ost(ej_event->handle,
201 ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
204 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
209 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
212 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
213 struct acpi_device *acpi_dev = to_acpi_device(dev);
215 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
217 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
220 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
221 struct acpi_device *acpi_dev = to_acpi_device(dev);
222 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
225 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
229 result = sprintf(buf, "%s\n", (char*)path.pointer);
234 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
236 /* sysfs file that shows description text from the ACPI _STR method */
237 static ssize_t description_show(struct device *dev,
238 struct device_attribute *attr,
240 struct acpi_device *acpi_dev = to_acpi_device(dev);
243 if (acpi_dev->pnp.str_obj == NULL)
247 * The _STR object contains a Unicode identifier for a device.
248 * We need to convert to utf-8 so it can be displayed.
250 result = utf16s_to_utf8s(
251 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
252 acpi_dev->pnp.str_obj->buffer.length,
253 UTF16_LITTLE_ENDIAN, buf,
256 buf[result++] = '\n';
260 static DEVICE_ATTR(description, 0444, description_show, NULL);
262 static int acpi_device_setup_files(struct acpi_device *dev)
264 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
270 * Devices gotten from FADT don't have a "path" attribute
273 result = device_create_file(&dev->dev, &dev_attr_path);
278 if (!list_empty(&dev->pnp.ids)) {
279 result = device_create_file(&dev->dev, &dev_attr_hid);
283 result = device_create_file(&dev->dev, &dev_attr_modalias);
289 * If device has _STR, 'description' file is created
291 status = acpi_get_handle(dev->handle, "_STR", &temp);
292 if (ACPI_SUCCESS(status)) {
293 status = acpi_evaluate_object(dev->handle, "_STR",
295 if (ACPI_FAILURE(status))
296 buffer.pointer = NULL;
297 dev->pnp.str_obj = buffer.pointer;
298 result = device_create_file(&dev->dev, &dev_attr_description);
304 * If device has _EJ0, 'eject' file is created that is used to trigger
305 * hot-removal function from userland.
307 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
308 if (ACPI_SUCCESS(status))
309 result = device_create_file(&dev->dev, &dev_attr_eject);
314 static void acpi_device_remove_files(struct acpi_device *dev)
320 * If device has _STR, remove 'description' file
322 status = acpi_get_handle(dev->handle, "_STR", &temp);
323 if (ACPI_SUCCESS(status)) {
324 kfree(dev->pnp.str_obj);
325 device_remove_file(&dev->dev, &dev_attr_description);
328 * If device has _EJ0, remove 'eject' file.
330 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
331 if (ACPI_SUCCESS(status))
332 device_remove_file(&dev->dev, &dev_attr_eject);
334 device_remove_file(&dev->dev, &dev_attr_modalias);
335 device_remove_file(&dev->dev, &dev_attr_hid);
337 device_remove_file(&dev->dev, &dev_attr_path);
339 /* --------------------------------------------------------------------------
341 -------------------------------------------------------------------------- */
343 int acpi_match_device_ids(struct acpi_device *device,
344 const struct acpi_device_id *ids)
346 const struct acpi_device_id *id;
347 struct acpi_hardware_id *hwid;
350 * If the device is not present, it is unnecessary to load device
353 if (!device->status.present)
356 for (id = ids; id->id[0]; id++)
357 list_for_each_entry(hwid, &device->pnp.ids, list)
358 if (!strcmp((char *) id->id, hwid->id))
363 EXPORT_SYMBOL(acpi_match_device_ids);
365 static void acpi_free_ids(struct acpi_device *device)
367 struct acpi_hardware_id *id, *tmp;
369 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
375 static void acpi_device_release(struct device *dev)
377 struct acpi_device *acpi_dev = to_acpi_device(dev);
379 acpi_free_ids(acpi_dev);
383 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
385 struct acpi_device *acpi_dev = to_acpi_device(dev);
386 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
388 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
391 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
393 struct acpi_device *acpi_dev = to_acpi_device(dev);
396 if (list_empty(&acpi_dev->pnp.ids))
399 if (add_uevent_var(env, "MODALIAS="))
401 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
402 sizeof(env->buf) - env->buflen);
403 if (len >= (sizeof(env->buf) - env->buflen))
409 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
411 struct acpi_device *device = data;
413 device->driver->ops.notify(device, event);
416 static acpi_status acpi_device_notify_fixed(void *data)
418 struct acpi_device *device = data;
420 /* Fixed hardware devices have no handles */
421 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
425 static int acpi_device_install_notify_handler(struct acpi_device *device)
429 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
431 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
432 acpi_device_notify_fixed,
434 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
436 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
437 acpi_device_notify_fixed,
440 status = acpi_install_notify_handler(device->handle,
445 if (ACPI_FAILURE(status))
450 static void acpi_device_remove_notify_handler(struct acpi_device *device)
452 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
453 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
454 acpi_device_notify_fixed);
455 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
456 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
457 acpi_device_notify_fixed);
459 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
463 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
464 static int acpi_start_single_object(struct acpi_device *);
465 static int acpi_device_probe(struct device * dev)
467 struct acpi_device *acpi_dev = to_acpi_device(dev);
468 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
471 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
473 if (acpi_dev->bus_ops.acpi_op_start)
474 acpi_start_single_object(acpi_dev);
476 if (acpi_drv->ops.notify) {
477 ret = acpi_device_install_notify_handler(acpi_dev);
479 if (acpi_drv->ops.remove)
480 acpi_drv->ops.remove(acpi_dev,
481 acpi_dev->removal_type);
486 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
487 "Found driver [%s] for device [%s]\n",
488 acpi_drv->name, acpi_dev->pnp.bus_id));
494 static int acpi_device_remove(struct device * dev)
496 struct acpi_device *acpi_dev = to_acpi_device(dev);
497 struct acpi_driver *acpi_drv = acpi_dev->driver;
500 if (acpi_drv->ops.notify)
501 acpi_device_remove_notify_handler(acpi_dev);
502 if (acpi_drv->ops.remove)
503 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
505 acpi_dev->driver = NULL;
506 acpi_dev->driver_data = NULL;
512 struct bus_type acpi_bus_type = {
514 .match = acpi_bus_match,
515 .probe = acpi_device_probe,
516 .remove = acpi_device_remove,
517 .uevent = acpi_device_uevent,
520 static int acpi_device_register(struct acpi_device *device)
523 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
529 * Link this device to its parent and siblings.
531 INIT_LIST_HEAD(&device->children);
532 INIT_LIST_HEAD(&device->node);
533 INIT_LIST_HEAD(&device->wakeup_list);
534 INIT_LIST_HEAD(&device->physical_node_list);
535 mutex_init(&device->physical_node_lock);
537 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
539 printk(KERN_ERR PREFIX "Memory allocation error\n");
543 mutex_lock(&acpi_device_lock);
545 * Find suitable bus_id and instance number in acpi_bus_id_list
546 * If failed, create one and link it into acpi_bus_id_list
548 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
549 if (!strcmp(acpi_device_bus_id->bus_id,
550 acpi_device_hid(device))) {
551 acpi_device_bus_id->instance_no++;
558 acpi_device_bus_id = new_bus_id;
559 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
560 acpi_device_bus_id->instance_no = 0;
561 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
563 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
566 list_add_tail(&device->node, &device->parent->children);
568 if (device->wakeup.flags.valid)
569 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
570 mutex_unlock(&acpi_device_lock);
573 device->dev.parent = &device->parent->dev;
574 device->dev.bus = &acpi_bus_type;
575 device->dev.release = &acpi_device_release;
576 result = device_register(&device->dev);
578 dev_err(&device->dev, "Error registering device\n");
582 result = acpi_device_setup_files(device);
584 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
585 dev_name(&device->dev));
587 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
590 mutex_lock(&acpi_device_lock);
592 list_del(&device->node);
593 list_del(&device->wakeup_list);
594 mutex_unlock(&acpi_device_lock);
598 static void acpi_device_unregister(struct acpi_device *device, int type)
600 mutex_lock(&acpi_device_lock);
602 list_del(&device->node);
604 list_del(&device->wakeup_list);
605 mutex_unlock(&acpi_device_lock);
607 acpi_detach_data(device->handle, acpi_bus_data_handler);
609 acpi_device_remove_files(device);
610 device_unregister(&device->dev);
613 /* --------------------------------------------------------------------------
615 -------------------------------------------------------------------------- */
617 * acpi_bus_driver_init - add a device to a driver
618 * @device: the device to add and initialize
619 * @driver: driver for the device
621 * Used to initialize a device via its device driver. Called whenever a
622 * driver is bound to a device. Invokes the driver's add() ops.
625 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
629 if (!device || !driver)
632 if (!driver->ops.add)
635 result = driver->ops.add(device);
637 device->driver = NULL;
638 device->driver_data = NULL;
642 device->driver = driver;
645 * TBD - Configuration Management: Assign resources to device based
646 * upon possible configuration and currently allocated resources.
649 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
650 "Driver successfully bound to device\n"));
654 static int acpi_start_single_object(struct acpi_device *device)
657 struct acpi_driver *driver;
660 if (!(driver = device->driver))
663 if (driver->ops.start) {
664 result = driver->ops.start(device);
665 if (result && driver->ops.remove)
666 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
673 * acpi_bus_register_driver - register a driver with the ACPI bus
674 * @driver: driver being registered
676 * Registers a driver with the ACPI bus. Searches the namespace for all
677 * devices that match the driver's criteria and binds. Returns zero for
678 * success or a negative error status for failure.
680 int acpi_bus_register_driver(struct acpi_driver *driver)
686 driver->drv.name = driver->name;
687 driver->drv.bus = &acpi_bus_type;
688 driver->drv.owner = driver->owner;
690 ret = driver_register(&driver->drv);
694 EXPORT_SYMBOL(acpi_bus_register_driver);
697 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
698 * @driver: driver to unregister
700 * Unregisters a driver with the ACPI bus. Searches the namespace for all
701 * devices that match the driver's criteria and unbinds.
703 void acpi_bus_unregister_driver(struct acpi_driver *driver)
705 driver_unregister(&driver->drv);
708 EXPORT_SYMBOL(acpi_bus_unregister_driver);
710 /* --------------------------------------------------------------------------
712 -------------------------------------------------------------------------- */
713 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
717 struct acpi_device *device;
720 * Fixed hardware devices do not appear in the namespace and do not
721 * have handles, but we fabricate acpi_devices for them, so we have
722 * to deal with them specially.
728 status = acpi_get_parent(handle, &handle);
729 if (status == AE_NULL_ENTRY)
731 if (ACPI_FAILURE(status))
734 ret = acpi_bus_get_device(handle, &device);
741 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
745 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
746 union acpi_object *obj;
748 status = acpi_get_handle(handle, "_EJD", &tmp);
749 if (ACPI_FAILURE(status))
752 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
753 if (ACPI_SUCCESS(status)) {
754 obj = buffer.pointer;
755 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
757 kfree(buffer.pointer);
761 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
763 void acpi_bus_data_handler(acpi_handle handle, void *context)
771 static int acpi_bus_get_perf_flags(struct acpi_device *device)
773 device->performance.state = ACPI_STATE_UNKNOWN;
778 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
779 struct acpi_device_wakeup *wakeup)
781 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
782 union acpi_object *package = NULL;
783 union acpi_object *element = NULL;
788 return AE_BAD_PARAMETER;
791 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
792 if (ACPI_FAILURE(status)) {
793 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
797 package = (union acpi_object *)buffer.pointer;
799 if (!package || (package->package.count < 2)) {
800 status = AE_BAD_DATA;
804 element = &(package->package.elements[0]);
806 status = AE_BAD_DATA;
809 if (element->type == ACPI_TYPE_PACKAGE) {
810 if ((element->package.count < 2) ||
811 (element->package.elements[0].type !=
812 ACPI_TYPE_LOCAL_REFERENCE)
813 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
814 status = AE_BAD_DATA;
818 element->package.elements[0].reference.handle;
820 (u32) element->package.elements[1].integer.value;
821 } else if (element->type == ACPI_TYPE_INTEGER) {
822 wakeup->gpe_device = NULL;
823 wakeup->gpe_number = element->integer.value;
825 status = AE_BAD_DATA;
829 element = &(package->package.elements[1]);
830 if (element->type != ACPI_TYPE_INTEGER) {
831 status = AE_BAD_DATA;
834 wakeup->sleep_state = element->integer.value;
836 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
837 status = AE_NO_MEMORY;
840 wakeup->resources.count = package->package.count - 2;
841 for (i = 0; i < wakeup->resources.count; i++) {
842 element = &(package->package.elements[i + 2]);
843 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
844 status = AE_BAD_DATA;
848 wakeup->resources.handles[i] = element->reference.handle;
851 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
854 kfree(buffer.pointer);
859 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
861 struct acpi_device_id button_device_ids[] = {
868 acpi_event_status event_status;
870 device->wakeup.flags.notifier_present = 0;
872 /* Power button, Lid switch always enable wakeup */
873 if (!acpi_match_device_ids(device, button_device_ids)) {
874 device->wakeup.flags.run_wake = 1;
875 device_set_wakeup_capable(&device->dev, true);
879 status = acpi_get_gpe_status(device->wakeup.gpe_device,
880 device->wakeup.gpe_number,
883 device->wakeup.flags.run_wake =
884 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
887 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
890 acpi_status status = 0;
893 /* Presence of _PRW indicates wake capable */
894 status = acpi_get_handle(device->handle, "_PRW", &temp);
895 if (ACPI_FAILURE(status))
898 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
900 if (ACPI_FAILURE(status)) {
901 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
905 device->wakeup.flags.valid = 1;
906 device->wakeup.prepare_count = 0;
907 acpi_bus_set_run_wake_flags(device);
908 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
909 * system for the ACPI device with the _PRW object.
910 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
911 * So it is necessary to call _DSW object first. Only when it is not
912 * present will the _PSW object used.
914 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
916 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
917 "error in _DSW or _PSW evaluation\n"));
920 static void acpi_bus_add_power_resource(acpi_handle handle);
922 static int acpi_bus_get_power_flags(struct acpi_device *device)
924 acpi_status status = 0;
925 acpi_handle handle = NULL;
930 * Power Management Flags
932 status = acpi_get_handle(device->handle, "_PSC", &handle);
933 if (ACPI_SUCCESS(status))
934 device->power.flags.explicit_get = 1;
935 status = acpi_get_handle(device->handle, "_IRC", &handle);
936 if (ACPI_SUCCESS(status))
937 device->power.flags.inrush_current = 1;
940 * Enumerate supported power management states
942 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
943 struct acpi_device_power_state *ps = &device->power.states[i];
944 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
946 /* Evaluate "_PRx" to se if power resources are referenced */
947 acpi_evaluate_reference(device->handle, object_name, NULL,
949 if (ps->resources.count) {
952 device->power.flags.power_resources = 1;
953 for (j = 0; j < ps->resources.count; j++)
954 acpi_bus_add_power_resource(ps->resources.handles[j]);
957 /* Evaluate "_PSx" to see if we can do explicit sets */
958 object_name[2] = 'S';
959 status = acpi_get_handle(device->handle, object_name, &handle);
960 if (ACPI_SUCCESS(status))
961 ps->flags.explicit_set = 1;
964 * State is valid if there are means to put the device into it.
965 * D3hot is only valid if _PR3 present.
967 if (ps->resources.count ||
968 (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
971 ps->power = -1; /* Unknown - driver assigned */
972 ps->latency = -1; /* Unknown - driver assigned */
975 /* Set defaults for D0 and D3 states (always valid) */
976 device->power.states[ACPI_STATE_D0].flags.valid = 1;
977 device->power.states[ACPI_STATE_D0].power = 100;
978 device->power.states[ACPI_STATE_D3].flags.valid = 1;
979 device->power.states[ACPI_STATE_D3].power = 0;
981 /* Set D3cold's explicit_set flag if _PS3 exists. */
982 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
983 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
985 acpi_bus_init_power(device);
990 static int acpi_bus_get_flags(struct acpi_device *device)
992 acpi_status status = AE_OK;
993 acpi_handle temp = NULL;
996 /* Presence of _STA indicates 'dynamic_status' */
997 status = acpi_get_handle(device->handle, "_STA", &temp);
998 if (ACPI_SUCCESS(status))
999 device->flags.dynamic_status = 1;
1001 /* Presence of _RMV indicates 'removable' */
1002 status = acpi_get_handle(device->handle, "_RMV", &temp);
1003 if (ACPI_SUCCESS(status))
1004 device->flags.removable = 1;
1006 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1007 status = acpi_get_handle(device->handle, "_EJD", &temp);
1008 if (ACPI_SUCCESS(status))
1009 device->flags.ejectable = 1;
1011 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1012 if (ACPI_SUCCESS(status))
1013 device->flags.ejectable = 1;
1016 /* Presence of _LCK indicates 'lockable' */
1017 status = acpi_get_handle(device->handle, "_LCK", &temp);
1018 if (ACPI_SUCCESS(status))
1019 device->flags.lockable = 1;
1021 /* Power resources cannot be power manageable. */
1022 if (device->device_type == ACPI_BUS_TYPE_POWER)
1025 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1026 status = acpi_get_handle(device->handle, "_PS0", &temp);
1027 if (ACPI_FAILURE(status))
1028 status = acpi_get_handle(device->handle, "_PR0", &temp);
1029 if (ACPI_SUCCESS(status))
1030 device->flags.power_manageable = 1;
1032 /* TBD: Performance management */
1037 static void acpi_device_get_busid(struct acpi_device *device)
1039 char bus_id[5] = { '?', 0 };
1040 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1046 * The device's Bus ID is simply the object name.
1047 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1049 if (ACPI_IS_ROOT_DEVICE(device)) {
1050 strcpy(device->pnp.bus_id, "ACPI");
1054 switch (device->device_type) {
1055 case ACPI_BUS_TYPE_POWER_BUTTON:
1056 strcpy(device->pnp.bus_id, "PWRF");
1058 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1059 strcpy(device->pnp.bus_id, "SLPF");
1062 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1063 /* Clean up trailing underscores (if any) */
1064 for (i = 3; i > 1; i--) {
1065 if (bus_id[i] == '_')
1070 strcpy(device->pnp.bus_id, bus_id);
1076 * acpi_bay_match - see if a device is an ejectable driver bay
1078 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1079 * then we can safely call it an ejectable drive bay
1081 static int acpi_bay_match(struct acpi_device *device){
1085 acpi_handle phandle;
1087 handle = device->handle;
1089 status = acpi_get_handle(handle, "_EJ0", &tmp);
1090 if (ACPI_FAILURE(status))
1093 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1094 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1095 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1096 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1099 if (acpi_get_parent(handle, &phandle))
1102 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1103 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1104 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1105 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1112 * acpi_dock_match - see if a device has a _DCK method
1114 static int acpi_dock_match(struct acpi_device *device)
1117 return acpi_get_handle(device->handle, "_DCK", &tmp);
1120 const char *acpi_device_hid(struct acpi_device *device)
1122 struct acpi_hardware_id *hid;
1124 if (list_empty(&device->pnp.ids))
1127 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1130 EXPORT_SYMBOL(acpi_device_hid);
1132 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1134 struct acpi_hardware_id *id;
1136 id = kmalloc(sizeof(*id), GFP_KERNEL);
1140 id->id = kstrdup(dev_id, GFP_KERNEL);
1146 list_add_tail(&id->list, &device->pnp.ids);
1150 * Old IBM workstations have a DSDT bug wherein the SMBus object
1151 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1152 * prefix. Work around this.
1154 static int acpi_ibm_smbus_match(struct acpi_device *device)
1156 acpi_handle h_dummy;
1157 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1160 if (!dmi_name_in_vendors("IBM"))
1163 /* Look for SMBS object */
1164 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1168 if (strcmp("SMBS", path.pointer)) {
1173 /* Does it have the necessary (but misnamed) methods? */
1175 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1176 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1177 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1180 kfree(path.pointer);
1184 static void acpi_device_set_id(struct acpi_device *device)
1187 struct acpi_device_info *info;
1188 struct acpica_device_id_list *cid_list;
1191 switch (device->device_type) {
1192 case ACPI_BUS_TYPE_DEVICE:
1193 if (ACPI_IS_ROOT_DEVICE(device)) {
1194 acpi_add_id(device, ACPI_SYSTEM_HID);
1198 status = acpi_get_object_info(device->handle, &info);
1199 if (ACPI_FAILURE(status)) {
1200 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1204 if (info->valid & ACPI_VALID_HID)
1205 acpi_add_id(device, info->hardware_id.string);
1206 if (info->valid & ACPI_VALID_CID) {
1207 cid_list = &info->compatible_id_list;
1208 for (i = 0; i < cid_list->count; i++)
1209 acpi_add_id(device, cid_list->ids[i].string);
1211 if (info->valid & ACPI_VALID_ADR) {
1212 device->pnp.bus_address = info->address;
1213 device->flags.bus_address = 1;
1219 * Some devices don't reliably have _HIDs & _CIDs, so add
1220 * synthetic HIDs to make sure drivers can find them.
1222 if (acpi_is_video_device(device))
1223 acpi_add_id(device, ACPI_VIDEO_HID);
1224 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1225 acpi_add_id(device, ACPI_BAY_HID);
1226 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1227 acpi_add_id(device, ACPI_DOCK_HID);
1228 else if (!acpi_ibm_smbus_match(device))
1229 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1230 else if (!acpi_device_hid(device) &&
1231 ACPI_IS_ROOT_DEVICE(device->parent)) {
1232 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1233 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1234 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1238 case ACPI_BUS_TYPE_POWER:
1239 acpi_add_id(device, ACPI_POWER_HID);
1241 case ACPI_BUS_TYPE_PROCESSOR:
1242 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1244 case ACPI_BUS_TYPE_THERMAL:
1245 acpi_add_id(device, ACPI_THERMAL_HID);
1247 case ACPI_BUS_TYPE_POWER_BUTTON:
1248 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1250 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1251 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1256 static int acpi_device_set_context(struct acpi_device *device)
1263 * Attach this 'struct acpi_device' to the ACPI object. This makes
1264 * resolutions from handle->device very efficient. Fixed hardware
1265 * devices have no handles, so we skip them.
1267 if (!device->handle)
1270 status = acpi_attach_data(device->handle,
1271 acpi_bus_data_handler, device);
1272 if (ACPI_SUCCESS(status))
1275 printk(KERN_ERR PREFIX "Error attaching device data\n");
1279 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1284 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1285 device_release_driver(&dev->dev);
1291 * unbind _ADR-Based Devices when hot removal
1293 if (dev->flags.bus_address) {
1294 if ((dev->parent) && (dev->parent->ops.unbind))
1295 dev->parent->ops.unbind(dev);
1297 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1302 static int acpi_add_single_object(struct acpi_device **child,
1303 acpi_handle handle, int type,
1304 unsigned long long sta,
1305 struct acpi_bus_ops *ops)
1308 struct acpi_device *device;
1309 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1311 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1313 printk(KERN_ERR PREFIX "Memory allocation error\n");
1317 INIT_LIST_HEAD(&device->pnp.ids);
1318 device->device_type = type;
1319 device->handle = handle;
1320 device->parent = acpi_bus_get_parent(handle);
1321 device->bus_ops = *ops; /* workround for not call .start */
1322 STRUCT_TO_INT(device->status) = sta;
1324 acpi_device_get_busid(device);
1329 * Note that we only look for object handles -- cannot evaluate objects
1330 * until we know the device is present and properly initialized.
1332 result = acpi_bus_get_flags(device);
1339 * TBD: Synch with Core's enumeration/initialization process.
1341 acpi_device_set_id(device);
1347 if (device->flags.power_manageable) {
1348 result = acpi_bus_get_power_flags(device);
1354 * Wakeup device management
1355 *-----------------------
1357 acpi_bus_get_wakeup_device_flags(device);
1360 * Performance Management
1361 * ----------------------
1363 if (device->flags.performance_manageable) {
1364 result = acpi_bus_get_perf_flags(device);
1369 if ((result = acpi_device_set_context(device)))
1372 result = acpi_device_register(device);
1375 * Bind _ADR-Based Devices when hot add
1377 if (device->flags.bus_address) {
1378 if (device->parent && device->parent->ops.bind)
1379 device->parent->ops.bind(device);
1384 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1385 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1386 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1387 (char *) buffer.pointer,
1388 device->parent ? dev_name(&device->parent->dev) :
1390 kfree(buffer.pointer);
1393 acpi_device_release(&device->dev);
1398 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1399 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1401 static void acpi_bus_add_power_resource(acpi_handle handle)
1403 struct acpi_bus_ops ops = {
1407 struct acpi_device *device = NULL;
1409 acpi_bus_get_device(handle, &device);
1411 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1412 ACPI_STA_DEFAULT, &ops);
1415 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1416 unsigned long long *sta)
1419 acpi_object_type acpi_type;
1421 status = acpi_get_type(handle, &acpi_type);
1422 if (ACPI_FAILURE(status))
1425 switch (acpi_type) {
1426 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1427 case ACPI_TYPE_DEVICE:
1428 *type = ACPI_BUS_TYPE_DEVICE;
1429 status = acpi_bus_get_status_handle(handle, sta);
1430 if (ACPI_FAILURE(status))
1433 case ACPI_TYPE_PROCESSOR:
1434 *type = ACPI_BUS_TYPE_PROCESSOR;
1435 status = acpi_bus_get_status_handle(handle, sta);
1436 if (ACPI_FAILURE(status))
1439 case ACPI_TYPE_THERMAL:
1440 *type = ACPI_BUS_TYPE_THERMAL;
1441 *sta = ACPI_STA_DEFAULT;
1443 case ACPI_TYPE_POWER:
1444 *type = ACPI_BUS_TYPE_POWER;
1445 *sta = ACPI_STA_DEFAULT;
1454 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1455 void *context, void **return_value)
1457 struct acpi_bus_ops *ops = context;
1459 unsigned long long sta;
1460 struct acpi_device *device;
1464 result = acpi_bus_type_and_status(handle, &type, &sta);
1468 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1469 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1470 struct acpi_device_wakeup wakeup;
1473 status = acpi_get_handle(handle, "_PRW", &temp);
1474 if (ACPI_SUCCESS(status))
1475 acpi_bus_extract_wakeup_device_power_package(handle,
1477 return AE_CTRL_DEPTH;
1481 * We may already have an acpi_device from a previous enumeration. If
1482 * so, we needn't add it again, but we may still have to start it.
1485 acpi_bus_get_device(handle, &device);
1486 if (ops->acpi_op_add && !device)
1487 acpi_add_single_object(&device, handle, type, sta, ops);
1490 return AE_CTRL_DEPTH;
1492 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1493 status = acpi_start_single_object(device);
1494 if (ACPI_FAILURE(status))
1495 return AE_CTRL_DEPTH;
1499 *return_value = device;
1503 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1504 struct acpi_device **child)
1507 void *device = NULL;
1509 status = acpi_bus_check_add(handle, 0, ops, &device);
1510 if (ACPI_SUCCESS(status))
1511 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1512 acpi_bus_check_add, NULL, ops, &device);
1524 * acpi_bus_add and acpi_bus_start
1526 * scan a given ACPI tree and (probably recently hot-plugged)
1527 * create and add or starts found devices.
1529 * If no devices were found -ENODEV is returned which does not
1530 * mean that this is a real error, there just have been no suitable
1531 * ACPI objects in the table trunk from which the kernel could create
1532 * a device and add/start an appropriate driver.
1536 acpi_bus_add(struct acpi_device **child,
1537 struct acpi_device *parent, acpi_handle handle, int type)
1539 struct acpi_bus_ops ops;
1541 memset(&ops, 0, sizeof(ops));
1542 ops.acpi_op_add = 1;
1544 return acpi_bus_scan(handle, &ops, child);
1546 EXPORT_SYMBOL(acpi_bus_add);
1548 int acpi_bus_start(struct acpi_device *device)
1550 struct acpi_bus_ops ops;
1556 memset(&ops, 0, sizeof(ops));
1557 ops.acpi_op_start = 1;
1559 result = acpi_bus_scan(device->handle, &ops, NULL);
1561 acpi_update_all_gpes();
1565 EXPORT_SYMBOL(acpi_bus_start);
1567 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1570 struct acpi_device *parent, *child;
1571 acpi_handle phandle, chandle;
1572 acpi_object_type type;
1577 phandle = start->handle;
1578 child = chandle = NULL;
1580 while ((level > 0) && parent && (!err)) {
1581 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1585 * If this scope is exhausted then move our way back up.
1587 if (ACPI_FAILURE(status)) {
1590 acpi_get_parent(phandle, &phandle);
1592 parent = parent->parent;
1595 err = acpi_bus_remove(child, rmdevice);
1597 err = acpi_bus_remove(child, 1);
1602 status = acpi_get_type(chandle, &type);
1603 if (ACPI_FAILURE(status)) {
1607 * If there is a device corresponding to chandle then
1608 * parse it (depth-first).
1610 if (acpi_bus_get_device(chandle, &child) == 0) {
1620 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1622 static int acpi_bus_scan_fixed(void)
1625 struct acpi_device *device = NULL;
1626 struct acpi_bus_ops ops;
1628 memset(&ops, 0, sizeof(ops));
1629 ops.acpi_op_add = 1;
1630 ops.acpi_op_start = 1;
1633 * Enumerate all fixed-feature devices.
1635 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1636 result = acpi_add_single_object(&device, NULL,
1637 ACPI_BUS_TYPE_POWER_BUTTON,
1640 device_init_wakeup(&device->dev, true);
1643 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1644 result = acpi_add_single_object(&device, NULL,
1645 ACPI_BUS_TYPE_SLEEP_BUTTON,
1653 int __init acpi_scan_init(void)
1656 struct acpi_bus_ops ops;
1658 memset(&ops, 0, sizeof(ops));
1659 ops.acpi_op_add = 1;
1660 ops.acpi_op_start = 1;
1662 result = bus_register(&acpi_bus_type);
1664 /* We don't want to quit even if we failed to add suspend/resume */
1665 printk(KERN_ERR PREFIX "Could not register bus type\n");
1671 * Enumerate devices in the ACPI namespace.
1673 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1676 result = acpi_bus_scan_fixed();
1679 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1681 acpi_update_all_gpes();