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>
14 #include <acpi/acpi_drivers.h>
18 #define _COMPONENT ACPI_BUS_COMPONENT
19 ACPI_MODULE_NAME("scan");
20 #define STRUCT_TO_INT(s) (*((int*)&s))
21 extern struct acpi_device *acpi_root;
23 #define ACPI_BUS_CLASS "system_bus"
24 #define ACPI_BUS_HID "LNXSYBUS"
25 #define ACPI_BUS_DEVICE_NAME "System Bus"
27 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
29 static const char *dummy_hid = "device";
31 static LIST_HEAD(acpi_device_list);
32 static LIST_HEAD(acpi_bus_id_list);
33 DEFINE_MUTEX(acpi_device_lock);
34 LIST_HEAD(acpi_wakeup_device_list);
36 struct acpi_device_bus_id{
38 unsigned int instance_no;
39 struct list_head node;
43 * Creates hid/cid(s) string needed for modalias and uevent
44 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
45 * char *modalias: "acpi:IBM0001:ACPI0001"
47 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
52 struct acpi_hardware_id *id;
54 if (list_empty(&acpi_dev->pnp.ids))
57 len = snprintf(modalias, size, "acpi:");
60 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
61 count = snprintf(&modalias[len], size, "%s:", id->id);
62 if (count < 0 || count >= size)
73 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
74 struct acpi_device *acpi_dev = to_acpi_device(dev);
77 /* Device has no HID and no CID or string is >1024 */
78 len = create_modalias(acpi_dev, buf, 1024);
84 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
86 static void acpi_bus_hot_remove_device(void *context)
88 struct acpi_device *device;
89 acpi_handle handle = context;
90 struct acpi_object_list arg_list;
91 union acpi_object arg;
92 acpi_status status = AE_OK;
94 if (acpi_bus_get_device(handle, &device))
100 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
101 "Hot-removing device %s...\n", dev_name(&device->dev)));
103 if (acpi_bus_trim(device, 1)) {
104 printk(KERN_ERR PREFIX
105 "Removing device failed\n");
109 /* power off device */
110 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
111 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
112 printk(KERN_WARNING PREFIX
113 "Power-off device failed\n");
115 if (device->flags.lockable) {
117 arg_list.pointer = &arg;
118 arg.type = ACPI_TYPE_INTEGER;
119 arg.integer.value = 0;
120 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
124 arg_list.pointer = &arg;
125 arg.type = ACPI_TYPE_INTEGER;
126 arg.integer.value = 1;
131 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
132 if (ACPI_FAILURE(status))
133 printk(KERN_WARNING PREFIX
134 "Eject device failed\n");
140 acpi_eject_store(struct device *d, struct device_attribute *attr,
141 const char *buf, size_t count)
145 acpi_object_type type = 0;
146 struct acpi_device *acpi_device = to_acpi_device(d);
148 if ((!count) || (buf[0] != '1')) {
152 if (acpi_device->driver == NULL) {
157 status = acpi_get_type(acpi_device->handle, &type);
158 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
163 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
168 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
171 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
172 struct acpi_device *acpi_dev = to_acpi_device(dev);
174 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
176 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
179 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
180 struct acpi_device *acpi_dev = to_acpi_device(dev);
181 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
184 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
188 result = sprintf(buf, "%s\n", (char*)path.pointer);
193 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
195 static int acpi_device_setup_files(struct acpi_device *dev)
202 * Devices gotten from FADT don't have a "path" attribute
205 result = device_create_file(&dev->dev, &dev_attr_path);
210 if (!list_empty(&dev->pnp.ids)) {
211 result = device_create_file(&dev->dev, &dev_attr_hid);
215 result = device_create_file(&dev->dev, &dev_attr_modalias);
221 * If device has _EJ0, 'eject' file is created that is used to trigger
222 * hot-removal function from userland.
224 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
225 if (ACPI_SUCCESS(status))
226 result = device_create_file(&dev->dev, &dev_attr_eject);
231 static void acpi_device_remove_files(struct acpi_device *dev)
237 * If device has _EJ0, 'eject' file is created that is used to trigger
238 * hot-removal function from userland.
240 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
241 if (ACPI_SUCCESS(status))
242 device_remove_file(&dev->dev, &dev_attr_eject);
244 device_remove_file(&dev->dev, &dev_attr_modalias);
245 device_remove_file(&dev->dev, &dev_attr_hid);
247 device_remove_file(&dev->dev, &dev_attr_path);
249 /* --------------------------------------------------------------------------
251 -------------------------------------------------------------------------- */
253 int acpi_match_device_ids(struct acpi_device *device,
254 const struct acpi_device_id *ids)
256 const struct acpi_device_id *id;
257 struct acpi_hardware_id *hwid;
260 * If the device is not present, it is unnecessary to load device
263 if (!device->status.present)
266 for (id = ids; id->id[0]; id++)
267 list_for_each_entry(hwid, &device->pnp.ids, list)
268 if (!strcmp((char *) id->id, hwid->id))
273 EXPORT_SYMBOL(acpi_match_device_ids);
275 static void acpi_free_ids(struct acpi_device *device)
277 struct acpi_hardware_id *id, *tmp;
279 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
285 static void acpi_device_release(struct device *dev)
287 struct acpi_device *acpi_dev = to_acpi_device(dev);
289 acpi_free_ids(acpi_dev);
293 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
295 struct acpi_device *acpi_dev = to_acpi_device(dev);
296 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
298 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
301 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
303 struct acpi_device *acpi_dev = to_acpi_device(dev);
306 if (list_empty(&acpi_dev->pnp.ids))
309 if (add_uevent_var(env, "MODALIAS="))
311 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
312 sizeof(env->buf) - env->buflen);
313 if (len >= (sizeof(env->buf) - env->buflen))
319 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
321 struct acpi_device *device = data;
323 device->driver->ops.notify(device, event);
326 static acpi_status acpi_device_notify_fixed(void *data)
328 struct acpi_device *device = data;
330 /* Fixed hardware devices have no handles */
331 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
335 static int acpi_device_install_notify_handler(struct acpi_device *device)
339 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
341 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
342 acpi_device_notify_fixed,
344 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
346 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
347 acpi_device_notify_fixed,
350 status = acpi_install_notify_handler(device->handle,
355 if (ACPI_FAILURE(status))
360 static void acpi_device_remove_notify_handler(struct acpi_device *device)
362 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
363 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
364 acpi_device_notify_fixed);
365 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
366 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
367 acpi_device_notify_fixed);
369 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
373 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
374 static int acpi_start_single_object(struct acpi_device *);
375 static int acpi_device_probe(struct device * dev)
377 struct acpi_device *acpi_dev = to_acpi_device(dev);
378 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
381 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
383 if (acpi_dev->bus_ops.acpi_op_start)
384 acpi_start_single_object(acpi_dev);
386 if (acpi_drv->ops.notify) {
387 ret = acpi_device_install_notify_handler(acpi_dev);
389 if (acpi_drv->ops.remove)
390 acpi_drv->ops.remove(acpi_dev,
391 acpi_dev->removal_type);
396 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
397 "Found driver [%s] for device [%s]\n",
398 acpi_drv->name, acpi_dev->pnp.bus_id));
404 static int acpi_device_remove(struct device * dev)
406 struct acpi_device *acpi_dev = to_acpi_device(dev);
407 struct acpi_driver *acpi_drv = acpi_dev->driver;
410 if (acpi_drv->ops.notify)
411 acpi_device_remove_notify_handler(acpi_dev);
412 if (acpi_drv->ops.remove)
413 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
415 acpi_dev->driver = NULL;
416 acpi_dev->driver_data = NULL;
422 struct bus_type acpi_bus_type = {
424 .match = acpi_bus_match,
425 .probe = acpi_device_probe,
426 .remove = acpi_device_remove,
427 .uevent = acpi_device_uevent,
430 static int acpi_device_register(struct acpi_device *device)
433 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
439 * Link this device to its parent and siblings.
441 INIT_LIST_HEAD(&device->children);
442 INIT_LIST_HEAD(&device->node);
443 INIT_LIST_HEAD(&device->wakeup_list);
445 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
447 printk(KERN_ERR PREFIX "Memory allocation error\n");
451 mutex_lock(&acpi_device_lock);
453 * Find suitable bus_id and instance number in acpi_bus_id_list
454 * If failed, create one and link it into acpi_bus_id_list
456 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
457 if (!strcmp(acpi_device_bus_id->bus_id,
458 acpi_device_hid(device))) {
459 acpi_device_bus_id->instance_no++;
466 acpi_device_bus_id = new_bus_id;
467 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
468 acpi_device_bus_id->instance_no = 0;
469 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
471 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
474 list_add_tail(&device->node, &device->parent->children);
476 if (device->wakeup.flags.valid)
477 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
478 mutex_unlock(&acpi_device_lock);
481 device->dev.parent = &device->parent->dev;
482 device->dev.bus = &acpi_bus_type;
483 device->dev.release = &acpi_device_release;
484 result = device_register(&device->dev);
486 dev_err(&device->dev, "Error registering device\n");
490 result = acpi_device_setup_files(device);
492 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
493 dev_name(&device->dev));
495 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
498 mutex_lock(&acpi_device_lock);
500 list_del(&device->node);
501 list_del(&device->wakeup_list);
502 mutex_unlock(&acpi_device_lock);
506 static void acpi_device_unregister(struct acpi_device *device, int type)
508 mutex_lock(&acpi_device_lock);
510 list_del(&device->node);
512 list_del(&device->wakeup_list);
513 mutex_unlock(&acpi_device_lock);
515 acpi_detach_data(device->handle, acpi_bus_data_handler);
517 acpi_device_remove_files(device);
518 device_unregister(&device->dev);
521 /* --------------------------------------------------------------------------
523 -------------------------------------------------------------------------- */
525 * acpi_bus_driver_init - add a device to a driver
526 * @device: the device to add and initialize
527 * @driver: driver for the device
529 * Used to initialize a device via its device driver. Called whenever a
530 * driver is bound to a device. Invokes the driver's add() ops.
533 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
537 if (!device || !driver)
540 if (!driver->ops.add)
543 result = driver->ops.add(device);
545 device->driver = NULL;
546 device->driver_data = NULL;
550 device->driver = driver;
553 * TBD - Configuration Management: Assign resources to device based
554 * upon possible configuration and currently allocated resources.
557 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
558 "Driver successfully bound to device\n"));
562 static int acpi_start_single_object(struct acpi_device *device)
565 struct acpi_driver *driver;
568 if (!(driver = device->driver))
571 if (driver->ops.start) {
572 result = driver->ops.start(device);
573 if (result && driver->ops.remove)
574 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
581 * acpi_bus_register_driver - register a driver with the ACPI bus
582 * @driver: driver being registered
584 * Registers a driver with the ACPI bus. Searches the namespace for all
585 * devices that match the driver's criteria and binds. Returns zero for
586 * success or a negative error status for failure.
588 int acpi_bus_register_driver(struct acpi_driver *driver)
594 driver->drv.name = driver->name;
595 driver->drv.bus = &acpi_bus_type;
596 driver->drv.owner = driver->owner;
598 ret = driver_register(&driver->drv);
602 EXPORT_SYMBOL(acpi_bus_register_driver);
605 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
606 * @driver: driver to unregister
608 * Unregisters a driver with the ACPI bus. Searches the namespace for all
609 * devices that match the driver's criteria and unbinds.
611 void acpi_bus_unregister_driver(struct acpi_driver *driver)
613 driver_unregister(&driver->drv);
616 EXPORT_SYMBOL(acpi_bus_unregister_driver);
618 /* --------------------------------------------------------------------------
620 -------------------------------------------------------------------------- */
621 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
625 struct acpi_device *device;
628 * Fixed hardware devices do not appear in the namespace and do not
629 * have handles, but we fabricate acpi_devices for them, so we have
630 * to deal with them specially.
636 status = acpi_get_parent(handle, &handle);
637 if (status == AE_NULL_ENTRY)
639 if (ACPI_FAILURE(status))
642 ret = acpi_bus_get_device(handle, &device);
649 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
653 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
654 union acpi_object *obj;
656 status = acpi_get_handle(handle, "_EJD", &tmp);
657 if (ACPI_FAILURE(status))
660 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
661 if (ACPI_SUCCESS(status)) {
662 obj = buffer.pointer;
663 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
665 kfree(buffer.pointer);
669 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
671 void acpi_bus_data_handler(acpi_handle handle, void *context)
679 static int acpi_bus_get_perf_flags(struct acpi_device *device)
681 device->performance.state = ACPI_STATE_UNKNOWN;
686 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
687 struct acpi_device_wakeup *wakeup)
689 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
690 union acpi_object *package = NULL;
691 union acpi_object *element = NULL;
696 return AE_BAD_PARAMETER;
699 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
700 if (ACPI_FAILURE(status)) {
701 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
705 package = (union acpi_object *)buffer.pointer;
707 if (!package || (package->package.count < 2)) {
708 status = AE_BAD_DATA;
712 element = &(package->package.elements[0]);
714 status = AE_BAD_DATA;
717 if (element->type == ACPI_TYPE_PACKAGE) {
718 if ((element->package.count < 2) ||
719 (element->package.elements[0].type !=
720 ACPI_TYPE_LOCAL_REFERENCE)
721 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
722 status = AE_BAD_DATA;
726 element->package.elements[0].reference.handle;
728 (u32) element->package.elements[1].integer.value;
729 } else if (element->type == ACPI_TYPE_INTEGER) {
730 wakeup->gpe_device = NULL;
731 wakeup->gpe_number = element->integer.value;
733 status = AE_BAD_DATA;
737 element = &(package->package.elements[1]);
738 if (element->type != ACPI_TYPE_INTEGER) {
739 status = AE_BAD_DATA;
742 wakeup->sleep_state = element->integer.value;
744 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
745 status = AE_NO_MEMORY;
748 wakeup->resources.count = package->package.count - 2;
749 for (i = 0; i < wakeup->resources.count; i++) {
750 element = &(package->package.elements[i + 2]);
751 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
752 status = AE_BAD_DATA;
756 wakeup->resources.handles[i] = element->reference.handle;
759 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
762 kfree(buffer.pointer);
767 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
769 struct acpi_device_id button_device_ids[] = {
776 acpi_event_status event_status;
778 device->wakeup.flags.notifier_present = 0;
780 /* Power button, Lid switch always enable wakeup */
781 if (!acpi_match_device_ids(device, button_device_ids)) {
782 device->wakeup.flags.run_wake = 1;
783 device_set_wakeup_capable(&device->dev, true);
787 status = acpi_get_gpe_status(device->wakeup.gpe_device,
788 device->wakeup.gpe_number,
791 device->wakeup.flags.run_wake =
792 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
795 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
798 acpi_status status = 0;
801 /* Presence of _PRW indicates wake capable */
802 status = acpi_get_handle(device->handle, "_PRW", &temp);
803 if (ACPI_FAILURE(status))
806 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
808 if (ACPI_FAILURE(status)) {
809 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
813 device->wakeup.flags.valid = 1;
814 device->wakeup.prepare_count = 0;
815 acpi_bus_set_run_wake_flags(device);
816 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
817 * system for the ACPI device with the _PRW object.
818 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
819 * So it is necessary to call _DSW object first. Only when it is not
820 * present will the _PSW object used.
822 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
824 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
825 "error in _DSW or _PSW evaluation\n"));
828 static void acpi_bus_add_power_resource(acpi_handle handle);
830 static int acpi_bus_get_power_flags(struct acpi_device *device)
832 acpi_status status = 0;
833 acpi_handle handle = NULL;
838 * Power Management Flags
840 status = acpi_get_handle(device->handle, "_PSC", &handle);
841 if (ACPI_SUCCESS(status))
842 device->power.flags.explicit_get = 1;
843 status = acpi_get_handle(device->handle, "_IRC", &handle);
844 if (ACPI_SUCCESS(status))
845 device->power.flags.inrush_current = 1;
848 * Enumerate supported power management states
850 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
851 struct acpi_device_power_state *ps = &device->power.states[i];
852 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
854 /* Evaluate "_PRx" to se if power resources are referenced */
855 acpi_evaluate_reference(device->handle, object_name, NULL,
857 if (ps->resources.count) {
860 device->power.flags.power_resources = 1;
861 for (j = 0; j < ps->resources.count; j++)
862 acpi_bus_add_power_resource(ps->resources.handles[j]);
865 /* Evaluate "_PSx" to see if we can do explicit sets */
866 object_name[2] = 'S';
867 status = acpi_get_handle(device->handle, object_name, &handle);
868 if (ACPI_SUCCESS(status))
869 ps->flags.explicit_set = 1;
872 * State is valid if there are means to put the device into it.
873 * D3hot is only valid if _PR3 present.
875 if (ps->resources.count ||
876 (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
879 ps->power = -1; /* Unknown - driver assigned */
880 ps->latency = -1; /* Unknown - driver assigned */
883 /* Set defaults for D0 and D3 states (always valid) */
884 device->power.states[ACPI_STATE_D0].flags.valid = 1;
885 device->power.states[ACPI_STATE_D0].power = 100;
886 device->power.states[ACPI_STATE_D3].flags.valid = 1;
887 device->power.states[ACPI_STATE_D3].power = 0;
889 /* Set D3cold's explicit_set flag if _PS3 exists. */
890 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
891 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
893 acpi_bus_init_power(device);
898 static int acpi_bus_get_flags(struct acpi_device *device)
900 acpi_status status = AE_OK;
901 acpi_handle temp = NULL;
904 /* Presence of _STA indicates 'dynamic_status' */
905 status = acpi_get_handle(device->handle, "_STA", &temp);
906 if (ACPI_SUCCESS(status))
907 device->flags.dynamic_status = 1;
909 /* Presence of _RMV indicates 'removable' */
910 status = acpi_get_handle(device->handle, "_RMV", &temp);
911 if (ACPI_SUCCESS(status))
912 device->flags.removable = 1;
914 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
915 status = acpi_get_handle(device->handle, "_EJD", &temp);
916 if (ACPI_SUCCESS(status))
917 device->flags.ejectable = 1;
919 status = acpi_get_handle(device->handle, "_EJ0", &temp);
920 if (ACPI_SUCCESS(status))
921 device->flags.ejectable = 1;
924 /* Presence of _LCK indicates 'lockable' */
925 status = acpi_get_handle(device->handle, "_LCK", &temp);
926 if (ACPI_SUCCESS(status))
927 device->flags.lockable = 1;
929 /* Power resources cannot be power manageable. */
930 if (device->device_type == ACPI_BUS_TYPE_POWER)
933 /* Presence of _PS0|_PR0 indicates 'power manageable' */
934 status = acpi_get_handle(device->handle, "_PS0", &temp);
935 if (ACPI_FAILURE(status))
936 status = acpi_get_handle(device->handle, "_PR0", &temp);
937 if (ACPI_SUCCESS(status))
938 device->flags.power_manageable = 1;
940 /* TBD: Performance management */
945 static void acpi_device_get_busid(struct acpi_device *device)
947 char bus_id[5] = { '?', 0 };
948 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
954 * The device's Bus ID is simply the object name.
955 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
957 if (ACPI_IS_ROOT_DEVICE(device)) {
958 strcpy(device->pnp.bus_id, "ACPI");
962 switch (device->device_type) {
963 case ACPI_BUS_TYPE_POWER_BUTTON:
964 strcpy(device->pnp.bus_id, "PWRF");
966 case ACPI_BUS_TYPE_SLEEP_BUTTON:
967 strcpy(device->pnp.bus_id, "SLPF");
970 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
971 /* Clean up trailing underscores (if any) */
972 for (i = 3; i > 1; i--) {
973 if (bus_id[i] == '_')
978 strcpy(device->pnp.bus_id, bus_id);
984 * acpi_bay_match - see if a device is an ejectable driver bay
986 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
987 * then we can safely call it an ejectable drive bay
989 static int acpi_bay_match(struct acpi_device *device){
995 handle = device->handle;
997 status = acpi_get_handle(handle, "_EJ0", &tmp);
998 if (ACPI_FAILURE(status))
1001 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1002 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1003 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1004 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1007 if (acpi_get_parent(handle, &phandle))
1010 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1011 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1012 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1013 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1020 * acpi_dock_match - see if a device has a _DCK method
1022 static int acpi_dock_match(struct acpi_device *device)
1025 return acpi_get_handle(device->handle, "_DCK", &tmp);
1028 const char *acpi_device_hid(struct acpi_device *device)
1030 struct acpi_hardware_id *hid;
1032 if (list_empty(&device->pnp.ids))
1035 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1038 EXPORT_SYMBOL(acpi_device_hid);
1040 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1042 struct acpi_hardware_id *id;
1044 id = kmalloc(sizeof(*id), GFP_KERNEL);
1048 id->id = kstrdup(dev_id, GFP_KERNEL);
1054 list_add_tail(&id->list, &device->pnp.ids);
1058 * Old IBM workstations have a DSDT bug wherein the SMBus object
1059 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1060 * prefix. Work around this.
1062 static int acpi_ibm_smbus_match(struct acpi_device *device)
1064 acpi_handle h_dummy;
1065 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1068 if (!dmi_name_in_vendors("IBM"))
1071 /* Look for SMBS object */
1072 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1076 if (strcmp("SMBS", path.pointer)) {
1081 /* Does it have the necessary (but misnamed) methods? */
1083 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1084 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1085 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1088 kfree(path.pointer);
1092 static void acpi_device_set_id(struct acpi_device *device)
1095 struct acpi_device_info *info;
1096 struct acpica_device_id_list *cid_list;
1099 switch (device->device_type) {
1100 case ACPI_BUS_TYPE_DEVICE:
1101 if (ACPI_IS_ROOT_DEVICE(device)) {
1102 acpi_add_id(device, ACPI_SYSTEM_HID);
1106 status = acpi_get_object_info(device->handle, &info);
1107 if (ACPI_FAILURE(status)) {
1108 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1112 if (info->valid & ACPI_VALID_HID)
1113 acpi_add_id(device, info->hardware_id.string);
1114 if (info->valid & ACPI_VALID_CID) {
1115 cid_list = &info->compatible_id_list;
1116 for (i = 0; i < cid_list->count; i++)
1117 acpi_add_id(device, cid_list->ids[i].string);
1119 if (info->valid & ACPI_VALID_ADR) {
1120 device->pnp.bus_address = info->address;
1121 device->flags.bus_address = 1;
1127 * Some devices don't reliably have _HIDs & _CIDs, so add
1128 * synthetic HIDs to make sure drivers can find them.
1130 if (acpi_is_video_device(device))
1131 acpi_add_id(device, ACPI_VIDEO_HID);
1132 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1133 acpi_add_id(device, ACPI_BAY_HID);
1134 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1135 acpi_add_id(device, ACPI_DOCK_HID);
1136 else if (!acpi_ibm_smbus_match(device))
1137 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1138 else if (!acpi_device_hid(device) &&
1139 ACPI_IS_ROOT_DEVICE(device->parent)) {
1140 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1141 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1142 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1146 case ACPI_BUS_TYPE_POWER:
1147 acpi_add_id(device, ACPI_POWER_HID);
1149 case ACPI_BUS_TYPE_PROCESSOR:
1150 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1152 case ACPI_BUS_TYPE_THERMAL:
1153 acpi_add_id(device, ACPI_THERMAL_HID);
1155 case ACPI_BUS_TYPE_POWER_BUTTON:
1156 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1158 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1159 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1164 static int acpi_device_set_context(struct acpi_device *device)
1171 * Attach this 'struct acpi_device' to the ACPI object. This makes
1172 * resolutions from handle->device very efficient. Fixed hardware
1173 * devices have no handles, so we skip them.
1175 if (!device->handle)
1178 status = acpi_attach_data(device->handle,
1179 acpi_bus_data_handler, device);
1180 if (ACPI_SUCCESS(status))
1183 printk(KERN_ERR PREFIX "Error attaching device data\n");
1187 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1192 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1193 device_release_driver(&dev->dev);
1199 * unbind _ADR-Based Devices when hot removal
1201 if (dev->flags.bus_address) {
1202 if ((dev->parent) && (dev->parent->ops.unbind))
1203 dev->parent->ops.unbind(dev);
1205 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1210 static int acpi_add_single_object(struct acpi_device **child,
1211 acpi_handle handle, int type,
1212 unsigned long long sta,
1213 struct acpi_bus_ops *ops)
1216 struct acpi_device *device;
1217 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1219 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1221 printk(KERN_ERR PREFIX "Memory allocation error\n");
1225 INIT_LIST_HEAD(&device->pnp.ids);
1226 device->device_type = type;
1227 device->handle = handle;
1228 device->parent = acpi_bus_get_parent(handle);
1229 device->bus_ops = *ops; /* workround for not call .start */
1230 STRUCT_TO_INT(device->status) = sta;
1232 acpi_device_get_busid(device);
1237 * Note that we only look for object handles -- cannot evaluate objects
1238 * until we know the device is present and properly initialized.
1240 result = acpi_bus_get_flags(device);
1247 * TBD: Synch with Core's enumeration/initialization process.
1249 acpi_device_set_id(device);
1255 if (device->flags.power_manageable) {
1256 result = acpi_bus_get_power_flags(device);
1262 * Wakeup device management
1263 *-----------------------
1265 acpi_bus_get_wakeup_device_flags(device);
1268 * Performance Management
1269 * ----------------------
1271 if (device->flags.performance_manageable) {
1272 result = acpi_bus_get_perf_flags(device);
1277 if ((result = acpi_device_set_context(device)))
1280 result = acpi_device_register(device);
1283 * Bind _ADR-Based Devices when hot add
1285 if (device->flags.bus_address) {
1286 if (device->parent && device->parent->ops.bind)
1287 device->parent->ops.bind(device);
1292 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1293 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1294 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1295 (char *) buffer.pointer,
1296 device->parent ? dev_name(&device->parent->dev) :
1298 kfree(buffer.pointer);
1301 acpi_device_release(&device->dev);
1306 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1307 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1309 static void acpi_bus_add_power_resource(acpi_handle handle)
1311 struct acpi_bus_ops ops = {
1315 struct acpi_device *device = NULL;
1317 acpi_bus_get_device(handle, &device);
1319 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1320 ACPI_STA_DEFAULT, &ops);
1323 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1324 unsigned long long *sta)
1327 acpi_object_type acpi_type;
1329 status = acpi_get_type(handle, &acpi_type);
1330 if (ACPI_FAILURE(status))
1333 switch (acpi_type) {
1334 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1335 case ACPI_TYPE_DEVICE:
1336 *type = ACPI_BUS_TYPE_DEVICE;
1337 status = acpi_bus_get_status_handle(handle, sta);
1338 if (ACPI_FAILURE(status))
1341 case ACPI_TYPE_PROCESSOR:
1342 *type = ACPI_BUS_TYPE_PROCESSOR;
1343 status = acpi_bus_get_status_handle(handle, sta);
1344 if (ACPI_FAILURE(status))
1347 case ACPI_TYPE_THERMAL:
1348 *type = ACPI_BUS_TYPE_THERMAL;
1349 *sta = ACPI_STA_DEFAULT;
1351 case ACPI_TYPE_POWER:
1352 *type = ACPI_BUS_TYPE_POWER;
1353 *sta = ACPI_STA_DEFAULT;
1362 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1363 void *context, void **return_value)
1365 struct acpi_bus_ops *ops = context;
1367 unsigned long long sta;
1368 struct acpi_device *device;
1372 result = acpi_bus_type_and_status(handle, &type, &sta);
1376 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1377 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1378 struct acpi_device_wakeup wakeup;
1381 status = acpi_get_handle(handle, "_PRW", &temp);
1382 if (ACPI_SUCCESS(status))
1383 acpi_bus_extract_wakeup_device_power_package(handle,
1385 return AE_CTRL_DEPTH;
1389 * We may already have an acpi_device from a previous enumeration. If
1390 * so, we needn't add it again, but we may still have to start it.
1393 acpi_bus_get_device(handle, &device);
1394 if (ops->acpi_op_add && !device)
1395 acpi_add_single_object(&device, handle, type, sta, ops);
1398 return AE_CTRL_DEPTH;
1400 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1401 status = acpi_start_single_object(device);
1402 if (ACPI_FAILURE(status))
1403 return AE_CTRL_DEPTH;
1407 *return_value = device;
1411 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1412 struct acpi_device **child)
1415 void *device = NULL;
1417 status = acpi_bus_check_add(handle, 0, ops, &device);
1418 if (ACPI_SUCCESS(status))
1419 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1420 acpi_bus_check_add, NULL, ops, &device);
1432 * acpi_bus_add and acpi_bus_start
1434 * scan a given ACPI tree and (probably recently hot-plugged)
1435 * create and add or starts found devices.
1437 * If no devices were found -ENODEV is returned which does not
1438 * mean that this is a real error, there just have been no suitable
1439 * ACPI objects in the table trunk from which the kernel could create
1440 * a device and add/start an appropriate driver.
1444 acpi_bus_add(struct acpi_device **child,
1445 struct acpi_device *parent, acpi_handle handle, int type)
1447 struct acpi_bus_ops ops;
1449 memset(&ops, 0, sizeof(ops));
1450 ops.acpi_op_add = 1;
1452 return acpi_bus_scan(handle, &ops, child);
1454 EXPORT_SYMBOL(acpi_bus_add);
1456 int acpi_bus_start(struct acpi_device *device)
1458 struct acpi_bus_ops ops;
1464 memset(&ops, 0, sizeof(ops));
1465 ops.acpi_op_start = 1;
1467 result = acpi_bus_scan(device->handle, &ops, NULL);
1469 acpi_update_all_gpes();
1473 EXPORT_SYMBOL(acpi_bus_start);
1475 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1478 struct acpi_device *parent, *child;
1479 acpi_handle phandle, chandle;
1480 acpi_object_type type;
1485 phandle = start->handle;
1486 child = chandle = NULL;
1488 while ((level > 0) && parent && (!err)) {
1489 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1493 * If this scope is exhausted then move our way back up.
1495 if (ACPI_FAILURE(status)) {
1498 acpi_get_parent(phandle, &phandle);
1500 parent = parent->parent;
1503 err = acpi_bus_remove(child, rmdevice);
1505 err = acpi_bus_remove(child, 1);
1510 status = acpi_get_type(chandle, &type);
1511 if (ACPI_FAILURE(status)) {
1515 * If there is a device corresponding to chandle then
1516 * parse it (depth-first).
1518 if (acpi_bus_get_device(chandle, &child) == 0) {
1528 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1530 static int acpi_bus_scan_fixed(void)
1533 struct acpi_device *device = NULL;
1534 struct acpi_bus_ops ops;
1536 memset(&ops, 0, sizeof(ops));
1537 ops.acpi_op_add = 1;
1538 ops.acpi_op_start = 1;
1541 * Enumerate all fixed-feature devices.
1543 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1544 result = acpi_add_single_object(&device, NULL,
1545 ACPI_BUS_TYPE_POWER_BUTTON,
1548 device_init_wakeup(&device->dev, true);
1551 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1552 result = acpi_add_single_object(&device, NULL,
1553 ACPI_BUS_TYPE_SLEEP_BUTTON,
1561 int __init acpi_scan_init(void)
1564 struct acpi_bus_ops ops;
1566 memset(&ops, 0, sizeof(ops));
1567 ops.acpi_op_add = 1;
1568 ops.acpi_op_start = 1;
1570 result = bus_register(&acpi_bus_type);
1572 /* We don't want to quit even if we failed to add suspend/resume */
1573 printk(KERN_ERR PREFIX "Could not register bus type\n");
1579 * Enumerate devices in the ACPI namespace.
1581 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1584 result = acpi_bus_scan_fixed();
1587 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1589 acpi_update_all_gpes();