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_device_suspend(struct device *dev, pm_message_t state)
295 struct acpi_device *acpi_dev = to_acpi_device(dev);
296 struct acpi_driver *acpi_drv = acpi_dev->driver;
298 if (acpi_drv && acpi_drv->ops.suspend)
299 return acpi_drv->ops.suspend(acpi_dev, state);
303 static int acpi_device_resume(struct device *dev)
305 struct acpi_device *acpi_dev = to_acpi_device(dev);
306 struct acpi_driver *acpi_drv = acpi_dev->driver;
308 if (acpi_drv && acpi_drv->ops.resume)
309 return acpi_drv->ops.resume(acpi_dev);
313 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
315 struct acpi_device *acpi_dev = to_acpi_device(dev);
316 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
318 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
321 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
323 struct acpi_device *acpi_dev = to_acpi_device(dev);
326 if (list_empty(&acpi_dev->pnp.ids))
329 if (add_uevent_var(env, "MODALIAS="))
331 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
332 sizeof(env->buf) - env->buflen);
333 if (len >= (sizeof(env->buf) - env->buflen))
339 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
341 struct acpi_device *device = data;
343 device->driver->ops.notify(device, event);
346 static acpi_status acpi_device_notify_fixed(void *data)
348 struct acpi_device *device = data;
350 /* Fixed hardware devices have no handles */
351 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
355 static int acpi_device_install_notify_handler(struct acpi_device *device)
359 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
361 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
362 acpi_device_notify_fixed,
364 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
366 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
367 acpi_device_notify_fixed,
370 status = acpi_install_notify_handler(device->handle,
375 if (ACPI_FAILURE(status))
380 static void acpi_device_remove_notify_handler(struct acpi_device *device)
382 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
383 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
384 acpi_device_notify_fixed);
385 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
386 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387 acpi_device_notify_fixed);
389 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
393 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
394 static int acpi_start_single_object(struct acpi_device *);
395 static int acpi_device_probe(struct device * dev)
397 struct acpi_device *acpi_dev = to_acpi_device(dev);
398 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
401 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
403 if (acpi_dev->bus_ops.acpi_op_start)
404 acpi_start_single_object(acpi_dev);
406 if (acpi_drv->ops.notify) {
407 ret = acpi_device_install_notify_handler(acpi_dev);
409 if (acpi_drv->ops.remove)
410 acpi_drv->ops.remove(acpi_dev,
411 acpi_dev->removal_type);
416 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
417 "Found driver [%s] for device [%s]\n",
418 acpi_drv->name, acpi_dev->pnp.bus_id));
424 static int acpi_device_remove(struct device * dev)
426 struct acpi_device *acpi_dev = to_acpi_device(dev);
427 struct acpi_driver *acpi_drv = acpi_dev->driver;
430 if (acpi_drv->ops.notify)
431 acpi_device_remove_notify_handler(acpi_dev);
432 if (acpi_drv->ops.remove)
433 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
435 acpi_dev->driver = NULL;
436 acpi_dev->driver_data = NULL;
442 struct bus_type acpi_bus_type = {
444 .suspend = acpi_device_suspend,
445 .resume = acpi_device_resume,
446 .match = acpi_bus_match,
447 .probe = acpi_device_probe,
448 .remove = acpi_device_remove,
449 .uevent = acpi_device_uevent,
452 static int acpi_device_register(struct acpi_device *device)
455 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
461 * Link this device to its parent and siblings.
463 INIT_LIST_HEAD(&device->children);
464 INIT_LIST_HEAD(&device->node);
465 INIT_LIST_HEAD(&device->wakeup_list);
467 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
469 printk(KERN_ERR PREFIX "Memory allocation error\n");
473 mutex_lock(&acpi_device_lock);
475 * Find suitable bus_id and instance number in acpi_bus_id_list
476 * If failed, create one and link it into acpi_bus_id_list
478 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
479 if (!strcmp(acpi_device_bus_id->bus_id,
480 acpi_device_hid(device))) {
481 acpi_device_bus_id->instance_no++;
488 acpi_device_bus_id = new_bus_id;
489 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
490 acpi_device_bus_id->instance_no = 0;
491 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
493 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
496 list_add_tail(&device->node, &device->parent->children);
498 if (device->wakeup.flags.valid)
499 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
500 mutex_unlock(&acpi_device_lock);
503 device->dev.parent = &device->parent->dev;
504 device->dev.bus = &acpi_bus_type;
505 device->dev.release = &acpi_device_release;
506 result = device_register(&device->dev);
508 dev_err(&device->dev, "Error registering device\n");
512 result = acpi_device_setup_files(device);
514 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
515 dev_name(&device->dev));
517 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
520 mutex_lock(&acpi_device_lock);
522 list_del(&device->node);
523 list_del(&device->wakeup_list);
524 mutex_unlock(&acpi_device_lock);
528 static void acpi_device_unregister(struct acpi_device *device, int type)
530 mutex_lock(&acpi_device_lock);
532 list_del(&device->node);
534 list_del(&device->wakeup_list);
535 mutex_unlock(&acpi_device_lock);
537 acpi_detach_data(device->handle, acpi_bus_data_handler);
539 acpi_device_remove_files(device);
540 device_unregister(&device->dev);
543 /* --------------------------------------------------------------------------
545 -------------------------------------------------------------------------- */
547 * acpi_bus_driver_init - add a device to a driver
548 * @device: the device to add and initialize
549 * @driver: driver for the device
551 * Used to initialize a device via its device driver. Called whenever a
552 * driver is bound to a device. Invokes the driver's add() ops.
555 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
559 if (!device || !driver)
562 if (!driver->ops.add)
565 result = driver->ops.add(device);
567 device->driver = NULL;
568 device->driver_data = NULL;
572 device->driver = driver;
575 * TBD - Configuration Management: Assign resources to device based
576 * upon possible configuration and currently allocated resources.
579 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
580 "Driver successfully bound to device\n"));
584 static int acpi_start_single_object(struct acpi_device *device)
587 struct acpi_driver *driver;
590 if (!(driver = device->driver))
593 if (driver->ops.start) {
594 result = driver->ops.start(device);
595 if (result && driver->ops.remove)
596 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
603 * acpi_bus_register_driver - register a driver with the ACPI bus
604 * @driver: driver being registered
606 * Registers a driver with the ACPI bus. Searches the namespace for all
607 * devices that match the driver's criteria and binds. Returns zero for
608 * success or a negative error status for failure.
610 int acpi_bus_register_driver(struct acpi_driver *driver)
616 driver->drv.name = driver->name;
617 driver->drv.bus = &acpi_bus_type;
618 driver->drv.owner = driver->owner;
620 ret = driver_register(&driver->drv);
624 EXPORT_SYMBOL(acpi_bus_register_driver);
627 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
628 * @driver: driver to unregister
630 * Unregisters a driver with the ACPI bus. Searches the namespace for all
631 * devices that match the driver's criteria and unbinds.
633 void acpi_bus_unregister_driver(struct acpi_driver *driver)
635 driver_unregister(&driver->drv);
638 EXPORT_SYMBOL(acpi_bus_unregister_driver);
640 /* --------------------------------------------------------------------------
642 -------------------------------------------------------------------------- */
643 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
647 struct acpi_device *device;
650 * Fixed hardware devices do not appear in the namespace and do not
651 * have handles, but we fabricate acpi_devices for them, so we have
652 * to deal with them specially.
658 status = acpi_get_parent(handle, &handle);
659 if (status == AE_NULL_ENTRY)
661 if (ACPI_FAILURE(status))
664 ret = acpi_bus_get_device(handle, &device);
671 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
675 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
676 union acpi_object *obj;
678 status = acpi_get_handle(handle, "_EJD", &tmp);
679 if (ACPI_FAILURE(status))
682 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
683 if (ACPI_SUCCESS(status)) {
684 obj = buffer.pointer;
685 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
687 kfree(buffer.pointer);
691 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
693 void acpi_bus_data_handler(acpi_handle handle, void *context)
701 static int acpi_bus_get_perf_flags(struct acpi_device *device)
703 device->performance.state = ACPI_STATE_UNKNOWN;
708 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
709 struct acpi_device_wakeup *wakeup)
711 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
712 union acpi_object *package = NULL;
713 union acpi_object *element = NULL;
718 return AE_BAD_PARAMETER;
721 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
722 if (ACPI_FAILURE(status)) {
723 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
727 package = (union acpi_object *)buffer.pointer;
729 if (!package || (package->package.count < 2)) {
730 status = AE_BAD_DATA;
734 element = &(package->package.elements[0]);
736 status = AE_BAD_DATA;
739 if (element->type == ACPI_TYPE_PACKAGE) {
740 if ((element->package.count < 2) ||
741 (element->package.elements[0].type !=
742 ACPI_TYPE_LOCAL_REFERENCE)
743 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
744 status = AE_BAD_DATA;
748 element->package.elements[0].reference.handle;
750 (u32) element->package.elements[1].integer.value;
751 } else if (element->type == ACPI_TYPE_INTEGER) {
752 wakeup->gpe_device = NULL;
753 wakeup->gpe_number = element->integer.value;
755 status = AE_BAD_DATA;
759 element = &(package->package.elements[1]);
760 if (element->type != ACPI_TYPE_INTEGER) {
761 status = AE_BAD_DATA;
764 wakeup->sleep_state = element->integer.value;
766 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
767 status = AE_NO_MEMORY;
770 wakeup->resources.count = package->package.count - 2;
771 for (i = 0; i < wakeup->resources.count; i++) {
772 element = &(package->package.elements[i + 2]);
773 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
774 status = AE_BAD_DATA;
778 wakeup->resources.handles[i] = element->reference.handle;
781 acpi_gpe_can_wake(wakeup->gpe_device, wakeup->gpe_number);
784 kfree(buffer.pointer);
789 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
791 struct acpi_device_id button_device_ids[] = {
798 acpi_event_status event_status;
800 device->wakeup.run_wake_count = 0;
801 device->wakeup.flags.notifier_present = 0;
803 /* Power button, Lid switch always enable wakeup */
804 if (!acpi_match_device_ids(device, button_device_ids)) {
805 device->wakeup.flags.run_wake = 1;
806 device->wakeup.flags.always_enabled = 1;
810 status = acpi_get_gpe_status(device->wakeup.gpe_device,
811 device->wakeup.gpe_number,
814 device->wakeup.flags.run_wake =
815 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
818 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
820 acpi_status status = 0;
823 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
825 if (ACPI_FAILURE(status)) {
826 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
830 device->wakeup.flags.valid = 1;
831 device->wakeup.prepare_count = 0;
832 acpi_bus_set_run_wake_flags(device);
833 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
834 * system for the ACPI device with the _PRW object.
835 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
836 * So it is necessary to call _DSW object first. Only when it is not
837 * present will the _PSW object used.
839 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
841 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
842 "error in _DSW or _PSW evaluation\n"));
845 if (ACPI_FAILURE(status))
846 device->flags.wake_capable = 0;
850 static int acpi_bus_get_power_flags(struct acpi_device *device)
852 acpi_status status = 0;
853 acpi_handle handle = NULL;
858 * Power Management Flags
860 status = acpi_get_handle(device->handle, "_PSC", &handle);
861 if (ACPI_SUCCESS(status))
862 device->power.flags.explicit_get = 1;
863 status = acpi_get_handle(device->handle, "_IRC", &handle);
864 if (ACPI_SUCCESS(status))
865 device->power.flags.inrush_current = 1;
868 * Enumerate supported power management states
870 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
871 struct acpi_device_power_state *ps = &device->power.states[i];
872 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
874 /* Evaluate "_PRx" to se if power resources are referenced */
875 acpi_evaluate_reference(device->handle, object_name, NULL,
877 if (ps->resources.count) {
878 device->power.flags.power_resources = 1;
882 /* Evaluate "_PSx" to see if we can do explicit sets */
883 object_name[2] = 'S';
884 status = acpi_get_handle(device->handle, object_name, &handle);
885 if (ACPI_SUCCESS(status)) {
886 ps->flags.explicit_set = 1;
890 /* State is valid if we have some power control */
891 if (ps->resources.count || ps->flags.explicit_set)
894 ps->power = -1; /* Unknown - driver assigned */
895 ps->latency = -1; /* Unknown - driver assigned */
898 /* Set defaults for D0 and D3 states (always valid) */
899 device->power.states[ACPI_STATE_D0].flags.valid = 1;
900 device->power.states[ACPI_STATE_D0].power = 100;
901 device->power.states[ACPI_STATE_D3].flags.valid = 1;
902 device->power.states[ACPI_STATE_D3].power = 0;
904 /* TBD: System wake support and resource requirements. */
906 device->power.state = ACPI_STATE_UNKNOWN;
907 acpi_bus_get_power(device->handle, &(device->power.state));
912 static int acpi_bus_get_flags(struct acpi_device *device)
914 acpi_status status = AE_OK;
915 acpi_handle temp = NULL;
918 /* Presence of _STA indicates 'dynamic_status' */
919 status = acpi_get_handle(device->handle, "_STA", &temp);
920 if (ACPI_SUCCESS(status))
921 device->flags.dynamic_status = 1;
923 /* Presence of _RMV indicates 'removable' */
924 status = acpi_get_handle(device->handle, "_RMV", &temp);
925 if (ACPI_SUCCESS(status))
926 device->flags.removable = 1;
928 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
929 status = acpi_get_handle(device->handle, "_EJD", &temp);
930 if (ACPI_SUCCESS(status))
931 device->flags.ejectable = 1;
933 status = acpi_get_handle(device->handle, "_EJ0", &temp);
934 if (ACPI_SUCCESS(status))
935 device->flags.ejectable = 1;
938 /* Presence of _LCK indicates 'lockable' */
939 status = acpi_get_handle(device->handle, "_LCK", &temp);
940 if (ACPI_SUCCESS(status))
941 device->flags.lockable = 1;
943 /* Presence of _PS0|_PR0 indicates 'power manageable' */
944 status = acpi_get_handle(device->handle, "_PS0", &temp);
945 if (ACPI_FAILURE(status))
946 status = acpi_get_handle(device->handle, "_PR0", &temp);
947 if (ACPI_SUCCESS(status))
948 device->flags.power_manageable = 1;
950 /* Presence of _PRW indicates wake capable */
951 status = acpi_get_handle(device->handle, "_PRW", &temp);
952 if (ACPI_SUCCESS(status))
953 device->flags.wake_capable = 1;
955 /* TBD: Performance management */
960 static void acpi_device_get_busid(struct acpi_device *device)
962 char bus_id[5] = { '?', 0 };
963 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
969 * The device's Bus ID is simply the object name.
970 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
972 if (ACPI_IS_ROOT_DEVICE(device)) {
973 strcpy(device->pnp.bus_id, "ACPI");
977 switch (device->device_type) {
978 case ACPI_BUS_TYPE_POWER_BUTTON:
979 strcpy(device->pnp.bus_id, "PWRF");
981 case ACPI_BUS_TYPE_SLEEP_BUTTON:
982 strcpy(device->pnp.bus_id, "SLPF");
985 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
986 /* Clean up trailing underscores (if any) */
987 for (i = 3; i > 1; i--) {
988 if (bus_id[i] == '_')
993 strcpy(device->pnp.bus_id, bus_id);
999 * acpi_bay_match - see if a device is an ejectable driver bay
1001 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1002 * then we can safely call it an ejectable drive bay
1004 static int acpi_bay_match(struct acpi_device *device){
1008 acpi_handle phandle;
1010 handle = device->handle;
1012 status = acpi_get_handle(handle, "_EJ0", &tmp);
1013 if (ACPI_FAILURE(status))
1016 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1017 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1018 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1019 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1022 if (acpi_get_parent(handle, &phandle))
1025 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1026 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1027 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1028 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1035 * acpi_dock_match - see if a device has a _DCK method
1037 static int acpi_dock_match(struct acpi_device *device)
1040 return acpi_get_handle(device->handle, "_DCK", &tmp);
1043 const char *acpi_device_hid(struct acpi_device *device)
1045 struct acpi_hardware_id *hid;
1047 if (list_empty(&device->pnp.ids))
1050 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1053 EXPORT_SYMBOL(acpi_device_hid);
1055 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1057 struct acpi_hardware_id *id;
1059 id = kmalloc(sizeof(*id), GFP_KERNEL);
1063 id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
1069 strcpy(id->id, dev_id);
1070 list_add_tail(&id->list, &device->pnp.ids);
1074 * Old IBM workstations have a DSDT bug wherein the SMBus object
1075 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1076 * prefix. Work around this.
1078 static int acpi_ibm_smbus_match(struct acpi_device *device)
1080 acpi_handle h_dummy;
1081 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1084 if (!dmi_name_in_vendors("IBM"))
1087 /* Look for SMBS object */
1088 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1092 if (strcmp("SMBS", path.pointer)) {
1097 /* Does it have the necessary (but misnamed) methods? */
1099 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1100 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1101 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1104 kfree(path.pointer);
1108 static void acpi_device_set_id(struct acpi_device *device)
1111 struct acpi_device_info *info;
1112 struct acpica_device_id_list *cid_list;
1115 switch (device->device_type) {
1116 case ACPI_BUS_TYPE_DEVICE:
1117 if (ACPI_IS_ROOT_DEVICE(device)) {
1118 acpi_add_id(device, ACPI_SYSTEM_HID);
1122 status = acpi_get_object_info(device->handle, &info);
1123 if (ACPI_FAILURE(status)) {
1124 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1128 if (info->valid & ACPI_VALID_HID)
1129 acpi_add_id(device, info->hardware_id.string);
1130 if (info->valid & ACPI_VALID_CID) {
1131 cid_list = &info->compatible_id_list;
1132 for (i = 0; i < cid_list->count; i++)
1133 acpi_add_id(device, cid_list->ids[i].string);
1135 if (info->valid & ACPI_VALID_ADR) {
1136 device->pnp.bus_address = info->address;
1137 device->flags.bus_address = 1;
1143 * Some devices don't reliably have _HIDs & _CIDs, so add
1144 * synthetic HIDs to make sure drivers can find them.
1146 if (acpi_is_video_device(device))
1147 acpi_add_id(device, ACPI_VIDEO_HID);
1148 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1149 acpi_add_id(device, ACPI_BAY_HID);
1150 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1151 acpi_add_id(device, ACPI_DOCK_HID);
1152 else if (!acpi_ibm_smbus_match(device))
1153 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1154 else if (!acpi_device_hid(device) &&
1155 ACPI_IS_ROOT_DEVICE(device->parent)) {
1156 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1157 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1158 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1162 case ACPI_BUS_TYPE_POWER:
1163 acpi_add_id(device, ACPI_POWER_HID);
1165 case ACPI_BUS_TYPE_PROCESSOR:
1166 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1168 case ACPI_BUS_TYPE_THERMAL:
1169 acpi_add_id(device, ACPI_THERMAL_HID);
1171 case ACPI_BUS_TYPE_POWER_BUTTON:
1172 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1174 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1175 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1180 static int acpi_device_set_context(struct acpi_device *device)
1187 * Attach this 'struct acpi_device' to the ACPI object. This makes
1188 * resolutions from handle->device very efficient. Fixed hardware
1189 * devices have no handles, so we skip them.
1191 if (!device->handle)
1194 status = acpi_attach_data(device->handle,
1195 acpi_bus_data_handler, device);
1196 if (ACPI_SUCCESS(status))
1199 printk(KERN_ERR PREFIX "Error attaching device data\n");
1203 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1208 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1209 device_release_driver(&dev->dev);
1215 * unbind _ADR-Based Devices when hot removal
1217 if (dev->flags.bus_address) {
1218 if ((dev->parent) && (dev->parent->ops.unbind))
1219 dev->parent->ops.unbind(dev);
1221 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1226 static int acpi_add_single_object(struct acpi_device **child,
1227 acpi_handle handle, int type,
1228 unsigned long long sta,
1229 struct acpi_bus_ops *ops)
1232 struct acpi_device *device;
1233 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1235 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1237 printk(KERN_ERR PREFIX "Memory allocation error\n");
1241 INIT_LIST_HEAD(&device->pnp.ids);
1242 device->device_type = type;
1243 device->handle = handle;
1244 device->parent = acpi_bus_get_parent(handle);
1245 device->bus_ops = *ops; /* workround for not call .start */
1246 STRUCT_TO_INT(device->status) = sta;
1248 acpi_device_get_busid(device);
1253 * Note that we only look for object handles -- cannot evaluate objects
1254 * until we know the device is present and properly initialized.
1256 result = acpi_bus_get_flags(device);
1263 * TBD: Synch with Core's enumeration/initialization process.
1265 acpi_device_set_id(device);
1271 if (device->flags.power_manageable) {
1272 result = acpi_bus_get_power_flags(device);
1278 * Wakeup device management
1279 *-----------------------
1281 if (device->flags.wake_capable) {
1282 result = acpi_bus_get_wakeup_device_flags(device);
1288 * Performance Management
1289 * ----------------------
1291 if (device->flags.performance_manageable) {
1292 result = acpi_bus_get_perf_flags(device);
1297 if ((result = acpi_device_set_context(device)))
1300 result = acpi_device_register(device);
1303 * Bind _ADR-Based Devices when hot add
1305 if (device->flags.bus_address) {
1306 if (device->parent && device->parent->ops.bind)
1307 device->parent->ops.bind(device);
1312 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1313 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1314 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1315 (char *) buffer.pointer,
1316 device->parent ? dev_name(&device->parent->dev) :
1318 kfree(buffer.pointer);
1321 acpi_device_release(&device->dev);
1326 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1327 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1329 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1330 unsigned long long *sta)
1333 acpi_object_type acpi_type;
1335 status = acpi_get_type(handle, &acpi_type);
1336 if (ACPI_FAILURE(status))
1339 switch (acpi_type) {
1340 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1341 case ACPI_TYPE_DEVICE:
1342 *type = ACPI_BUS_TYPE_DEVICE;
1343 status = acpi_bus_get_status_handle(handle, sta);
1344 if (ACPI_FAILURE(status))
1347 case ACPI_TYPE_PROCESSOR:
1348 *type = ACPI_BUS_TYPE_PROCESSOR;
1349 status = acpi_bus_get_status_handle(handle, sta);
1350 if (ACPI_FAILURE(status))
1353 case ACPI_TYPE_THERMAL:
1354 *type = ACPI_BUS_TYPE_THERMAL;
1355 *sta = ACPI_STA_DEFAULT;
1357 case ACPI_TYPE_POWER:
1358 *type = ACPI_BUS_TYPE_POWER;
1359 *sta = ACPI_STA_DEFAULT;
1368 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1369 void *context, void **return_value)
1371 struct acpi_bus_ops *ops = context;
1373 unsigned long long sta;
1374 struct acpi_device_wakeup wakeup;
1375 struct acpi_device *device;
1379 result = acpi_bus_type_and_status(handle, &type, &sta);
1383 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1384 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1385 acpi_bus_extract_wakeup_device_power_package(handle, &wakeup);
1386 return AE_CTRL_DEPTH;
1390 * We may already have an acpi_device from a previous enumeration. If
1391 * so, we needn't add it again, but we may still have to start it.
1394 acpi_bus_get_device(handle, &device);
1395 if (ops->acpi_op_add && !device)
1396 acpi_add_single_object(&device, handle, type, sta, ops);
1399 return AE_CTRL_DEPTH;
1401 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1402 status = acpi_start_single_object(device);
1403 if (ACPI_FAILURE(status))
1404 return AE_CTRL_DEPTH;
1408 *return_value = device;
1412 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1413 struct acpi_device **child)
1416 void *device = NULL;
1418 status = acpi_bus_check_add(handle, 0, ops, &device);
1419 if (ACPI_SUCCESS(status))
1420 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1421 acpi_bus_check_add, NULL, ops, &device);
1433 * acpi_bus_add and acpi_bus_start
1435 * scan a given ACPI tree and (probably recently hot-plugged)
1436 * create and add or starts found devices.
1438 * If no devices were found -ENODEV is returned which does not
1439 * mean that this is a real error, there just have been no suitable
1440 * ACPI objects in the table trunk from which the kernel could create
1441 * a device and add/start an appropriate driver.
1445 acpi_bus_add(struct acpi_device **child,
1446 struct acpi_device *parent, acpi_handle handle, int type)
1448 struct acpi_bus_ops ops;
1450 memset(&ops, 0, sizeof(ops));
1451 ops.acpi_op_add = 1;
1453 return acpi_bus_scan(handle, &ops, child);
1455 EXPORT_SYMBOL(acpi_bus_add);
1457 int acpi_bus_start(struct acpi_device *device)
1459 struct acpi_bus_ops ops;
1465 memset(&ops, 0, sizeof(ops));
1466 ops.acpi_op_start = 1;
1468 result = acpi_bus_scan(device->handle, &ops, NULL);
1474 EXPORT_SYMBOL(acpi_bus_start);
1476 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1479 struct acpi_device *parent, *child;
1480 acpi_handle phandle, chandle;
1481 acpi_object_type type;
1486 phandle = start->handle;
1487 child = chandle = NULL;
1489 while ((level > 0) && parent && (!err)) {
1490 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1494 * If this scope is exhausted then move our way back up.
1496 if (ACPI_FAILURE(status)) {
1499 acpi_get_parent(phandle, &phandle);
1501 parent = parent->parent;
1504 err = acpi_bus_remove(child, rmdevice);
1506 err = acpi_bus_remove(child, 1);
1511 status = acpi_get_type(chandle, &type);
1512 if (ACPI_FAILURE(status)) {
1516 * If there is a device corresponding to chandle then
1517 * parse it (depth-first).
1519 if (acpi_bus_get_device(chandle, &child) == 0) {
1529 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1531 static int acpi_bus_scan_fixed(void)
1534 struct acpi_device *device = NULL;
1535 struct acpi_bus_ops ops;
1537 memset(&ops, 0, sizeof(ops));
1538 ops.acpi_op_add = 1;
1539 ops.acpi_op_start = 1;
1542 * Enumerate all fixed-feature devices.
1544 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1545 result = acpi_add_single_object(&device, NULL,
1546 ACPI_BUS_TYPE_POWER_BUTTON,
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");
1577 * Enumerate devices in the ACPI namespace.
1579 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1582 result = acpi_bus_scan_fixed();
1585 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);