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);
178 #ifdef CONFIG_PCI_GUESTDEV
180 acpi_device_uid_show(struct device *dev, struct device_attribute *attr, char *buf) {
181 struct acpi_device *acpi_dev = to_acpi_device(dev);
183 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
185 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
189 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
190 struct acpi_device *acpi_dev = to_acpi_device(dev);
191 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
194 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
198 result = sprintf(buf, "%s\n", (char*)path.pointer);
203 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
205 static int acpi_device_setup_files(struct acpi_device *dev)
212 * Devices gotten from FADT don't have a "path" attribute
215 result = device_create_file(&dev->dev, &dev_attr_path);
220 if (!list_empty(&dev->pnp.ids)) {
221 result = device_create_file(&dev->dev, &dev_attr_hid);
225 result = device_create_file(&dev->dev, &dev_attr_modalias);
230 #ifdef CONFIG_PCI_GUESTDEV
231 if(dev->pnp.unique_id) {
232 result = device_create_file(&dev->dev, &dev_attr_uid);
238 * If device has _EJ0, 'eject' file is created that is used to trigger
239 * hot-removal function from userland.
241 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
242 if (ACPI_SUCCESS(status))
243 result = device_create_file(&dev->dev, &dev_attr_eject);
248 static void acpi_device_remove_files(struct acpi_device *dev)
254 * If device has _EJ0, 'eject' file is created that is used to trigger
255 * hot-removal function from userland.
257 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
258 if (ACPI_SUCCESS(status))
259 device_remove_file(&dev->dev, &dev_attr_eject);
261 device_remove_file(&dev->dev, &dev_attr_modalias);
262 device_remove_file(&dev->dev, &dev_attr_hid);
264 device_remove_file(&dev->dev, &dev_attr_path);
266 /* --------------------------------------------------------------------------
268 -------------------------------------------------------------------------- */
270 int acpi_match_device_ids(struct acpi_device *device,
271 const struct acpi_device_id *ids)
273 const struct acpi_device_id *id;
274 struct acpi_hardware_id *hwid;
277 * If the device is not present, it is unnecessary to load device
280 if (!device->status.present)
283 for (id = ids; id->id[0]; id++)
284 list_for_each_entry(hwid, &device->pnp.ids, list)
285 if (!strcmp((char *) id->id, hwid->id))
290 EXPORT_SYMBOL(acpi_match_device_ids);
292 static void acpi_free_ids(struct acpi_device *device)
294 struct acpi_hardware_id *id, *tmp;
296 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
300 #ifdef CONFIG_PCI_GUESTDEV
301 kfree(device->pnp.unique_id);
305 static void acpi_device_release(struct device *dev)
307 struct acpi_device *acpi_dev = to_acpi_device(dev);
309 acpi_free_ids(acpi_dev);
313 static int acpi_device_suspend(struct device *dev, pm_message_t state)
315 struct acpi_device *acpi_dev = to_acpi_device(dev);
316 struct acpi_driver *acpi_drv = acpi_dev->driver;
318 if (acpi_drv && acpi_drv->ops.suspend)
319 return acpi_drv->ops.suspend(acpi_dev, state);
323 static int acpi_device_resume(struct device *dev)
325 struct acpi_device *acpi_dev = to_acpi_device(dev);
326 struct acpi_driver *acpi_drv = acpi_dev->driver;
328 if (acpi_drv && acpi_drv->ops.resume)
329 return acpi_drv->ops.resume(acpi_dev);
333 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
335 struct acpi_device *acpi_dev = to_acpi_device(dev);
336 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
338 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
341 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
343 struct acpi_device *acpi_dev = to_acpi_device(dev);
346 if (list_empty(&acpi_dev->pnp.ids))
349 if (add_uevent_var(env, "MODALIAS="))
351 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
352 sizeof(env->buf) - env->buflen);
353 if (len >= (sizeof(env->buf) - env->buflen))
359 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
361 struct acpi_device *device = data;
363 device->driver->ops.notify(device, event);
366 static acpi_status acpi_device_notify_fixed(void *data)
368 struct acpi_device *device = data;
370 /* Fixed hardware devices have no handles */
371 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
375 static int acpi_device_install_notify_handler(struct acpi_device *device)
379 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
381 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
382 acpi_device_notify_fixed,
384 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
386 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387 acpi_device_notify_fixed,
390 status = acpi_install_notify_handler(device->handle,
395 if (ACPI_FAILURE(status))
400 static void acpi_device_remove_notify_handler(struct acpi_device *device)
402 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
403 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
404 acpi_device_notify_fixed);
405 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
406 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
407 acpi_device_notify_fixed);
409 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
413 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
414 static int acpi_start_single_object(struct acpi_device *);
415 static int acpi_device_probe(struct device * dev)
417 struct acpi_device *acpi_dev = to_acpi_device(dev);
418 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
421 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
423 if (acpi_dev->bus_ops.acpi_op_start)
424 acpi_start_single_object(acpi_dev);
426 if (acpi_drv->ops.notify) {
427 ret = acpi_device_install_notify_handler(acpi_dev);
429 if (acpi_drv->ops.remove)
430 acpi_drv->ops.remove(acpi_dev,
431 acpi_dev->removal_type);
436 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
437 "Found driver [%s] for device [%s]\n",
438 acpi_drv->name, acpi_dev->pnp.bus_id));
444 static int acpi_device_remove(struct device * dev)
446 struct acpi_device *acpi_dev = to_acpi_device(dev);
447 struct acpi_driver *acpi_drv = acpi_dev->driver;
450 if (acpi_drv->ops.notify)
451 acpi_device_remove_notify_handler(acpi_dev);
452 if (acpi_drv->ops.remove)
453 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
455 acpi_dev->driver = NULL;
456 acpi_dev->driver_data = NULL;
462 struct bus_type acpi_bus_type = {
464 .suspend = acpi_device_suspend,
465 .resume = acpi_device_resume,
466 .match = acpi_bus_match,
467 .probe = acpi_device_probe,
468 .remove = acpi_device_remove,
469 .uevent = acpi_device_uevent,
472 static int acpi_device_register(struct acpi_device *device)
475 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
481 * Link this device to its parent and siblings.
483 INIT_LIST_HEAD(&device->children);
484 INIT_LIST_HEAD(&device->node);
485 INIT_LIST_HEAD(&device->wakeup_list);
487 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
489 printk(KERN_ERR PREFIX "Memory allocation error\n");
493 mutex_lock(&acpi_device_lock);
495 * Find suitable bus_id and instance number in acpi_bus_id_list
496 * If failed, create one and link it into acpi_bus_id_list
498 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
499 if (!strcmp(acpi_device_bus_id->bus_id,
500 acpi_device_hid(device))) {
501 acpi_device_bus_id->instance_no++;
508 acpi_device_bus_id = new_bus_id;
509 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
510 acpi_device_bus_id->instance_no = 0;
511 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
513 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
516 list_add_tail(&device->node, &device->parent->children);
518 if (device->wakeup.flags.valid)
519 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
520 mutex_unlock(&acpi_device_lock);
523 device->dev.parent = &device->parent->dev;
524 device->dev.bus = &acpi_bus_type;
525 device->dev.release = &acpi_device_release;
526 result = device_register(&device->dev);
528 dev_err(&device->dev, "Error registering device\n");
532 result = acpi_device_setup_files(device);
534 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
535 dev_name(&device->dev));
537 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
540 mutex_lock(&acpi_device_lock);
542 list_del(&device->node);
543 list_del(&device->wakeup_list);
544 mutex_unlock(&acpi_device_lock);
548 static void acpi_device_unregister(struct acpi_device *device, int type)
550 mutex_lock(&acpi_device_lock);
552 list_del(&device->node);
554 list_del(&device->wakeup_list);
555 mutex_unlock(&acpi_device_lock);
557 acpi_detach_data(device->handle, acpi_bus_data_handler);
559 acpi_device_remove_files(device);
560 device_unregister(&device->dev);
563 /* --------------------------------------------------------------------------
565 -------------------------------------------------------------------------- */
567 * acpi_bus_driver_init - add a device to a driver
568 * @device: the device to add and initialize
569 * @driver: driver for the device
571 * Used to initialize a device via its device driver. Called whenever a
572 * driver is bound to a device. Invokes the driver's add() ops.
575 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
579 if (!device || !driver)
582 if (!driver->ops.add)
585 result = driver->ops.add(device);
587 device->driver = NULL;
588 device->driver_data = NULL;
592 device->driver = driver;
595 * TBD - Configuration Management: Assign resources to device based
596 * upon possible configuration and currently allocated resources.
599 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
600 "Driver successfully bound to device\n"));
604 static int acpi_start_single_object(struct acpi_device *device)
607 struct acpi_driver *driver;
610 if (!(driver = device->driver))
613 if (driver->ops.start) {
614 result = driver->ops.start(device);
615 if (result && driver->ops.remove)
616 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
623 * acpi_bus_register_driver - register a driver with the ACPI bus
624 * @driver: driver being registered
626 * Registers a driver with the ACPI bus. Searches the namespace for all
627 * devices that match the driver's criteria and binds. Returns zero for
628 * success or a negative error status for failure.
630 int acpi_bus_register_driver(struct acpi_driver *driver)
636 driver->drv.name = driver->name;
637 driver->drv.bus = &acpi_bus_type;
638 driver->drv.owner = driver->owner;
640 ret = driver_register(&driver->drv);
644 EXPORT_SYMBOL(acpi_bus_register_driver);
647 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
648 * @driver: driver to unregister
650 * Unregisters a driver with the ACPI bus. Searches the namespace for all
651 * devices that match the driver's criteria and unbinds.
653 void acpi_bus_unregister_driver(struct acpi_driver *driver)
655 driver_unregister(&driver->drv);
658 EXPORT_SYMBOL(acpi_bus_unregister_driver);
660 /* --------------------------------------------------------------------------
662 -------------------------------------------------------------------------- */
663 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
667 struct acpi_device *device;
670 * Fixed hardware devices do not appear in the namespace and do not
671 * have handles, but we fabricate acpi_devices for them, so we have
672 * to deal with them specially.
678 status = acpi_get_parent(handle, &handle);
679 if (status == AE_NULL_ENTRY)
681 if (ACPI_FAILURE(status))
684 ret = acpi_bus_get_device(handle, &device);
691 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
695 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
696 union acpi_object *obj;
698 status = acpi_get_handle(handle, "_EJD", &tmp);
699 if (ACPI_FAILURE(status))
702 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
703 if (ACPI_SUCCESS(status)) {
704 obj = buffer.pointer;
705 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
707 kfree(buffer.pointer);
711 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
713 void acpi_bus_data_handler(acpi_handle handle, void *context)
721 static int acpi_bus_get_perf_flags(struct acpi_device *device)
723 device->performance.state = ACPI_STATE_UNKNOWN;
728 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
729 union acpi_object *package)
732 union acpi_object *element = NULL;
734 if (!device || !package || (package->package.count < 2))
735 return AE_BAD_PARAMETER;
737 element = &(package->package.elements[0]);
739 return AE_BAD_PARAMETER;
740 if (element->type == ACPI_TYPE_PACKAGE) {
741 if ((element->package.count < 2) ||
742 (element->package.elements[0].type !=
743 ACPI_TYPE_LOCAL_REFERENCE)
744 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
746 device->wakeup.gpe_device =
747 element->package.elements[0].reference.handle;
748 device->wakeup.gpe_number =
749 (u32) element->package.elements[1].integer.value;
750 } else if (element->type == ACPI_TYPE_INTEGER) {
751 device->wakeup.gpe_number = element->integer.value;
755 element = &(package->package.elements[1]);
756 if (element->type != ACPI_TYPE_INTEGER) {
759 device->wakeup.sleep_state = element->integer.value;
761 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
764 device->wakeup.resources.count = package->package.count - 2;
765 for (i = 0; i < device->wakeup.resources.count; i++) {
766 element = &(package->package.elements[i + 2]);
767 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
770 device->wakeup.resources.handles[i] = element->reference.handle;
773 acpi_gpe_can_wake(device->wakeup.gpe_device, device->wakeup.gpe_number);
778 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
780 struct acpi_device_id button_device_ids[] = {
787 acpi_event_status event_status;
789 device->wakeup.run_wake_count = 0;
790 device->wakeup.flags.notifier_present = 0;
792 /* Power button, Lid switch always enable wakeup */
793 if (!acpi_match_device_ids(device, button_device_ids)) {
794 device->wakeup.flags.run_wake = 1;
795 device->wakeup.flags.always_enabled = 1;
799 status = acpi_get_gpe_status(device->wakeup.gpe_device,
800 device->wakeup.gpe_number,
803 device->wakeup.flags.run_wake =
804 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
807 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
809 acpi_status status = 0;
810 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
811 union acpi_object *package = NULL;
815 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
816 if (ACPI_FAILURE(status)) {
817 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
821 package = (union acpi_object *)buffer.pointer;
822 status = acpi_bus_extract_wakeup_device_power_package(device, package);
823 if (ACPI_FAILURE(status)) {
824 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
828 kfree(buffer.pointer);
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 #ifdef CONFIG_PCI_GUESTDEV
1136 if (info->valid & ACPI_VALID_UID)
1137 device->pnp.unique_id = kstrdup(info->unique_id.string,
1140 if (info->valid & ACPI_VALID_ADR) {
1141 device->pnp.bus_address = info->address;
1142 device->flags.bus_address = 1;
1148 * Some devices don't reliably have _HIDs & _CIDs, so add
1149 * synthetic HIDs to make sure drivers can find them.
1151 if (acpi_is_video_device(device))
1152 acpi_add_id(device, ACPI_VIDEO_HID);
1153 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1154 acpi_add_id(device, ACPI_BAY_HID);
1155 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1156 acpi_add_id(device, ACPI_DOCK_HID);
1157 else if (!acpi_ibm_smbus_match(device))
1158 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1159 else if (!acpi_device_hid(device) &&
1160 ACPI_IS_ROOT_DEVICE(device->parent)) {
1161 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1162 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1163 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1167 case ACPI_BUS_TYPE_POWER:
1168 acpi_add_id(device, ACPI_POWER_HID);
1170 case ACPI_BUS_TYPE_PROCESSOR:
1171 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1173 case ACPI_BUS_TYPE_THERMAL:
1174 acpi_add_id(device, ACPI_THERMAL_HID);
1176 case ACPI_BUS_TYPE_POWER_BUTTON:
1177 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1179 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1180 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1185 static int acpi_device_set_context(struct acpi_device *device)
1192 * Attach this 'struct acpi_device' to the ACPI object. This makes
1193 * resolutions from handle->device very efficient. Fixed hardware
1194 * devices have no handles, so we skip them.
1196 if (!device->handle)
1199 status = acpi_attach_data(device->handle,
1200 acpi_bus_data_handler, device);
1201 if (ACPI_SUCCESS(status))
1204 printk(KERN_ERR PREFIX "Error attaching device data\n");
1208 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1213 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1214 device_release_driver(&dev->dev);
1220 * unbind _ADR-Based Devices when hot removal
1222 if (dev->flags.bus_address) {
1223 if ((dev->parent) && (dev->parent->ops.unbind))
1224 dev->parent->ops.unbind(dev);
1226 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1231 static int acpi_add_single_object(struct acpi_device **child,
1232 acpi_handle handle, int type,
1233 unsigned long long sta,
1234 struct acpi_bus_ops *ops)
1237 struct acpi_device *device;
1238 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1240 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1242 printk(KERN_ERR PREFIX "Memory allocation error\n");
1246 INIT_LIST_HEAD(&device->pnp.ids);
1247 device->device_type = type;
1248 device->handle = handle;
1249 device->parent = acpi_bus_get_parent(handle);
1250 device->bus_ops = *ops; /* workround for not call .start */
1251 STRUCT_TO_INT(device->status) = sta;
1253 acpi_device_get_busid(device);
1258 * Note that we only look for object handles -- cannot evaluate objects
1259 * until we know the device is present and properly initialized.
1261 result = acpi_bus_get_flags(device);
1268 * TBD: Synch with Core's enumeration/initialization process.
1270 acpi_device_set_id(device);
1276 if (device->flags.power_manageable) {
1277 result = acpi_bus_get_power_flags(device);
1283 * Wakeup device management
1284 *-----------------------
1286 if (device->flags.wake_capable) {
1287 result = acpi_bus_get_wakeup_device_flags(device);
1293 * Performance Management
1294 * ----------------------
1296 if (device->flags.performance_manageable) {
1297 result = acpi_bus_get_perf_flags(device);
1302 if ((result = acpi_device_set_context(device)))
1305 result = acpi_device_register(device);
1308 * Bind _ADR-Based Devices when hot add
1310 if (device->flags.bus_address) {
1311 if (device->parent && device->parent->ops.bind)
1312 device->parent->ops.bind(device);
1317 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1318 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1319 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1320 (char *) buffer.pointer,
1321 device->parent ? dev_name(&device->parent->dev) :
1323 kfree(buffer.pointer);
1326 acpi_device_release(&device->dev);
1331 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1332 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1334 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1335 unsigned long long *sta)
1338 acpi_object_type acpi_type;
1340 status = acpi_get_type(handle, &acpi_type);
1341 if (ACPI_FAILURE(status))
1344 switch (acpi_type) {
1345 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1346 case ACPI_TYPE_DEVICE:
1347 *type = ACPI_BUS_TYPE_DEVICE;
1348 status = acpi_bus_get_status_handle(handle, sta);
1349 if (ACPI_FAILURE(status))
1352 case ACPI_TYPE_PROCESSOR:
1353 *type = ACPI_BUS_TYPE_PROCESSOR;
1354 status = acpi_bus_get_status_handle(handle, sta);
1355 if (ACPI_FAILURE(status))
1358 case ACPI_TYPE_THERMAL:
1359 *type = ACPI_BUS_TYPE_THERMAL;
1360 *sta = ACPI_STA_DEFAULT;
1362 case ACPI_TYPE_POWER:
1363 *type = ACPI_BUS_TYPE_POWER;
1364 *sta = ACPI_STA_DEFAULT;
1373 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1374 void *context, void **return_value)
1376 struct acpi_bus_ops *ops = context;
1378 unsigned long long sta;
1379 struct acpi_device *device;
1383 result = acpi_bus_type_and_status(handle, &type, &sta);
1387 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1388 !(sta & ACPI_STA_DEVICE_FUNCTIONING))
1389 return AE_CTRL_DEPTH;
1392 * We may already have an acpi_device from a previous enumeration. If
1393 * so, we needn't add it again, but we may still have to start it.
1396 acpi_bus_get_device(handle, &device);
1397 if (ops->acpi_op_add && !device)
1398 acpi_add_single_object(&device, handle, type, sta, ops);
1401 return AE_CTRL_DEPTH;
1403 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1404 status = acpi_start_single_object(device);
1405 if (ACPI_FAILURE(status))
1406 return AE_CTRL_DEPTH;
1410 *return_value = device;
1414 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1415 struct acpi_device **child)
1418 void *device = NULL;
1420 status = acpi_bus_check_add(handle, 0, ops, &device);
1421 if (ACPI_SUCCESS(status))
1422 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1423 acpi_bus_check_add, NULL, ops, &device);
1435 * acpi_bus_add and acpi_bus_start
1437 * scan a given ACPI tree and (probably recently hot-plugged)
1438 * create and add or starts found devices.
1440 * If no devices were found -ENODEV is returned which does not
1441 * mean that this is a real error, there just have been no suitable
1442 * ACPI objects in the table trunk from which the kernel could create
1443 * a device and add/start an appropriate driver.
1447 acpi_bus_add(struct acpi_device **child,
1448 struct acpi_device *parent, acpi_handle handle, int type)
1450 struct acpi_bus_ops ops;
1452 memset(&ops, 0, sizeof(ops));
1453 ops.acpi_op_add = 1;
1455 return acpi_bus_scan(handle, &ops, child);
1457 EXPORT_SYMBOL(acpi_bus_add);
1459 int acpi_bus_start(struct acpi_device *device)
1461 struct acpi_bus_ops ops;
1467 memset(&ops, 0, sizeof(ops));
1468 ops.acpi_op_start = 1;
1470 result = acpi_bus_scan(device->handle, &ops, NULL);
1476 EXPORT_SYMBOL(acpi_bus_start);
1478 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1481 struct acpi_device *parent, *child;
1482 acpi_handle phandle, chandle;
1483 acpi_object_type type;
1488 phandle = start->handle;
1489 child = chandle = NULL;
1491 while ((level > 0) && parent && (!err)) {
1492 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1496 * If this scope is exhausted then move our way back up.
1498 if (ACPI_FAILURE(status)) {
1501 acpi_get_parent(phandle, &phandle);
1503 parent = parent->parent;
1506 err = acpi_bus_remove(child, rmdevice);
1508 err = acpi_bus_remove(child, 1);
1513 status = acpi_get_type(chandle, &type);
1514 if (ACPI_FAILURE(status)) {
1518 * If there is a device corresponding to chandle then
1519 * parse it (depth-first).
1521 if (acpi_bus_get_device(chandle, &child) == 0) {
1531 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1533 static int acpi_bus_scan_fixed(void)
1536 struct acpi_device *device = NULL;
1537 struct acpi_bus_ops ops;
1539 memset(&ops, 0, sizeof(ops));
1540 ops.acpi_op_add = 1;
1541 ops.acpi_op_start = 1;
1544 * Enumerate all fixed-feature devices.
1546 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1547 result = acpi_add_single_object(&device, NULL,
1548 ACPI_BUS_TYPE_POWER_BUTTON,
1553 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1554 result = acpi_add_single_object(&device, NULL,
1555 ACPI_BUS_TYPE_SLEEP_BUTTON,
1563 int __init acpi_scan_init(void)
1566 struct acpi_bus_ops ops;
1568 memset(&ops, 0, sizeof(ops));
1569 ops.acpi_op_add = 1;
1570 ops.acpi_op_start = 1;
1572 result = bus_register(&acpi_bus_type);
1574 /* We don't want to quit even if we failed to add suspend/resume */
1575 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);