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);
87 * acpi_bus_hot_remove_device: hot-remove a device and its children
88 * @context: struct acpi_eject_event pointer (freed in this func)
90 * Hot-remove a device and its children. This function frees up the
91 * memory space passed by arg context, so that the caller may call
92 * this function asynchronously through acpi_os_hotplug_execute().
94 void acpi_bus_hot_remove_device(void *context)
96 struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
97 struct acpi_device *device;
98 acpi_handle handle = ej_event->handle;
99 struct acpi_object_list arg_list;
100 union acpi_object arg;
101 acpi_status status = AE_OK;
102 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
104 if (acpi_bus_get_device(handle, &device))
110 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
111 "Hot-removing device %s...\n", dev_name(&device->dev)));
113 if (acpi_bus_trim(device, 1)) {
114 printk(KERN_ERR PREFIX
115 "Removing device failed\n");
119 /* power off device */
120 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
121 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
122 printk(KERN_WARNING PREFIX
123 "Power-off device failed\n");
125 if (device->flags.lockable) {
127 arg_list.pointer = &arg;
128 arg.type = ACPI_TYPE_INTEGER;
129 arg.integer.value = 0;
130 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
134 arg_list.pointer = &arg;
135 arg.type = ACPI_TYPE_INTEGER;
136 arg.integer.value = 1;
141 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
142 if (ACPI_FAILURE(status)) {
143 if (status != AE_NOT_FOUND)
144 printk(KERN_WARNING PREFIX
145 "Eject device failed\n");
153 /* Inform firmware the hot-remove operation has completed w/ error */
154 (void) acpi_evaluate_hotplug_ost(handle,
155 ej_event->event, ost_code, NULL);
161 acpi_eject_store(struct device *d, struct device_attribute *attr,
162 const char *buf, size_t count)
166 acpi_object_type type = 0;
167 struct acpi_device *acpi_device = to_acpi_device(d);
168 struct acpi_eject_event *ej_event;
170 if ((!count) || (buf[0] != '1')) {
174 if (acpi_device->driver == NULL) {
179 status = acpi_get_type(acpi_device->handle, &type);
180 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
185 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
191 ej_event->handle = acpi_device->handle;
192 if (acpi_device->flags.eject_pending) {
193 /* event originated from ACPI eject notification */
194 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
195 acpi_device->flags.eject_pending = 0;
197 /* event originated from user */
198 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
199 (void) acpi_evaluate_hotplug_ost(ej_event->handle,
200 ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
203 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
208 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
211 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
212 struct acpi_device *acpi_dev = to_acpi_device(dev);
214 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
216 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
219 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
220 struct acpi_device *acpi_dev = to_acpi_device(dev);
221 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
224 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
228 result = sprintf(buf, "%s\n", (char*)path.pointer);
233 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
235 static int acpi_device_setup_files(struct acpi_device *dev)
242 * Devices gotten from FADT don't have a "path" attribute
245 result = device_create_file(&dev->dev, &dev_attr_path);
250 if (!list_empty(&dev->pnp.ids)) {
251 result = device_create_file(&dev->dev, &dev_attr_hid);
255 result = device_create_file(&dev->dev, &dev_attr_modalias);
261 * If device has _EJ0, 'eject' file is created that is used to trigger
262 * hot-removal function from userland.
264 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
265 if (ACPI_SUCCESS(status))
266 result = device_create_file(&dev->dev, &dev_attr_eject);
271 static void acpi_device_remove_files(struct acpi_device *dev)
277 * If device has _EJ0, 'eject' file is created that is used to trigger
278 * hot-removal function from userland.
280 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
281 if (ACPI_SUCCESS(status))
282 device_remove_file(&dev->dev, &dev_attr_eject);
284 device_remove_file(&dev->dev, &dev_attr_modalias);
285 device_remove_file(&dev->dev, &dev_attr_hid);
287 device_remove_file(&dev->dev, &dev_attr_path);
289 /* --------------------------------------------------------------------------
291 -------------------------------------------------------------------------- */
293 int acpi_match_device_ids(struct acpi_device *device,
294 const struct acpi_device_id *ids)
296 const struct acpi_device_id *id;
297 struct acpi_hardware_id *hwid;
300 * If the device is not present, it is unnecessary to load device
303 if (!device->status.present)
306 for (id = ids; id->id[0]; id++)
307 list_for_each_entry(hwid, &device->pnp.ids, list)
308 if (!strcmp((char *) id->id, hwid->id))
313 EXPORT_SYMBOL(acpi_match_device_ids);
315 static void acpi_free_ids(struct acpi_device *device)
317 struct acpi_hardware_id *id, *tmp;
319 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
325 static void acpi_device_release(struct device *dev)
327 struct acpi_device *acpi_dev = to_acpi_device(dev);
329 acpi_free_ids(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 .match = acpi_bus_match,
465 .probe = acpi_device_probe,
466 .remove = acpi_device_remove,
467 .uevent = acpi_device_uevent,
470 static int acpi_device_register(struct acpi_device *device)
473 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
479 * Link this device to its parent and siblings.
481 INIT_LIST_HEAD(&device->children);
482 INIT_LIST_HEAD(&device->node);
483 INIT_LIST_HEAD(&device->wakeup_list);
485 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
487 printk(KERN_ERR PREFIX "Memory allocation error\n");
491 mutex_lock(&acpi_device_lock);
493 * Find suitable bus_id and instance number in acpi_bus_id_list
494 * If failed, create one and link it into acpi_bus_id_list
496 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
497 if (!strcmp(acpi_device_bus_id->bus_id,
498 acpi_device_hid(device))) {
499 acpi_device_bus_id->instance_no++;
506 acpi_device_bus_id = new_bus_id;
507 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
508 acpi_device_bus_id->instance_no = 0;
509 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
511 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
514 list_add_tail(&device->node, &device->parent->children);
516 if (device->wakeup.flags.valid)
517 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
518 mutex_unlock(&acpi_device_lock);
521 device->dev.parent = &device->parent->dev;
522 device->dev.bus = &acpi_bus_type;
523 device->dev.release = &acpi_device_release;
524 result = device_register(&device->dev);
526 dev_err(&device->dev, "Error registering device\n");
530 result = acpi_device_setup_files(device);
532 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
533 dev_name(&device->dev));
535 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
538 mutex_lock(&acpi_device_lock);
540 list_del(&device->node);
541 list_del(&device->wakeup_list);
542 mutex_unlock(&acpi_device_lock);
546 static void acpi_device_unregister(struct acpi_device *device, int type)
548 mutex_lock(&acpi_device_lock);
550 list_del(&device->node);
552 list_del(&device->wakeup_list);
553 mutex_unlock(&acpi_device_lock);
555 acpi_detach_data(device->handle, acpi_bus_data_handler);
557 acpi_device_remove_files(device);
558 device_unregister(&device->dev);
561 /* --------------------------------------------------------------------------
563 -------------------------------------------------------------------------- */
565 * acpi_bus_driver_init - add a device to a driver
566 * @device: the device to add and initialize
567 * @driver: driver for the device
569 * Used to initialize a device via its device driver. Called whenever a
570 * driver is bound to a device. Invokes the driver's add() ops.
573 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
577 if (!device || !driver)
580 if (!driver->ops.add)
583 result = driver->ops.add(device);
585 device->driver = NULL;
586 device->driver_data = NULL;
590 device->driver = driver;
593 * TBD - Configuration Management: Assign resources to device based
594 * upon possible configuration and currently allocated resources.
597 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
598 "Driver successfully bound to device\n"));
602 static int acpi_start_single_object(struct acpi_device *device)
605 struct acpi_driver *driver;
608 if (!(driver = device->driver))
611 if (driver->ops.start) {
612 result = driver->ops.start(device);
613 if (result && driver->ops.remove)
614 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
621 * acpi_bus_register_driver - register a driver with the ACPI bus
622 * @driver: driver being registered
624 * Registers a driver with the ACPI bus. Searches the namespace for all
625 * devices that match the driver's criteria and binds. Returns zero for
626 * success or a negative error status for failure.
628 int acpi_bus_register_driver(struct acpi_driver *driver)
634 driver->drv.name = driver->name;
635 driver->drv.bus = &acpi_bus_type;
636 driver->drv.owner = driver->owner;
638 ret = driver_register(&driver->drv);
642 EXPORT_SYMBOL(acpi_bus_register_driver);
645 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
646 * @driver: driver to unregister
648 * Unregisters a driver with the ACPI bus. Searches the namespace for all
649 * devices that match the driver's criteria and unbinds.
651 void acpi_bus_unregister_driver(struct acpi_driver *driver)
653 driver_unregister(&driver->drv);
656 EXPORT_SYMBOL(acpi_bus_unregister_driver);
658 /* --------------------------------------------------------------------------
660 -------------------------------------------------------------------------- */
661 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
665 struct acpi_device *device;
668 * Fixed hardware devices do not appear in the namespace and do not
669 * have handles, but we fabricate acpi_devices for them, so we have
670 * to deal with them specially.
676 status = acpi_get_parent(handle, &handle);
677 if (status == AE_NULL_ENTRY)
679 if (ACPI_FAILURE(status))
682 ret = acpi_bus_get_device(handle, &device);
689 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
693 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
694 union acpi_object *obj;
696 status = acpi_get_handle(handle, "_EJD", &tmp);
697 if (ACPI_FAILURE(status))
700 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
701 if (ACPI_SUCCESS(status)) {
702 obj = buffer.pointer;
703 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
705 kfree(buffer.pointer);
709 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
711 void acpi_bus_data_handler(acpi_handle handle, void *context)
719 static int acpi_bus_get_perf_flags(struct acpi_device *device)
721 device->performance.state = ACPI_STATE_UNKNOWN;
726 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
727 struct acpi_device_wakeup *wakeup)
729 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
730 union acpi_object *package = NULL;
731 union acpi_object *element = NULL;
736 return AE_BAD_PARAMETER;
739 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
740 if (ACPI_FAILURE(status)) {
741 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
745 package = (union acpi_object *)buffer.pointer;
747 if (!package || (package->package.count < 2)) {
748 status = AE_BAD_DATA;
752 element = &(package->package.elements[0]);
754 status = AE_BAD_DATA;
757 if (element->type == ACPI_TYPE_PACKAGE) {
758 if ((element->package.count < 2) ||
759 (element->package.elements[0].type !=
760 ACPI_TYPE_LOCAL_REFERENCE)
761 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
762 status = AE_BAD_DATA;
766 element->package.elements[0].reference.handle;
768 (u32) element->package.elements[1].integer.value;
769 } else if (element->type == ACPI_TYPE_INTEGER) {
770 wakeup->gpe_device = NULL;
771 wakeup->gpe_number = element->integer.value;
773 status = AE_BAD_DATA;
777 element = &(package->package.elements[1]);
778 if (element->type != ACPI_TYPE_INTEGER) {
779 status = AE_BAD_DATA;
782 wakeup->sleep_state = element->integer.value;
784 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
785 status = AE_NO_MEMORY;
788 wakeup->resources.count = package->package.count - 2;
789 for (i = 0; i < wakeup->resources.count; i++) {
790 element = &(package->package.elements[i + 2]);
791 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
792 status = AE_BAD_DATA;
796 wakeup->resources.handles[i] = element->reference.handle;
799 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
802 kfree(buffer.pointer);
807 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
809 struct acpi_device_id button_device_ids[] = {
816 acpi_event_status event_status;
818 device->wakeup.flags.notifier_present = 0;
820 /* Power button, Lid switch always enable wakeup */
821 if (!acpi_match_device_ids(device, button_device_ids)) {
822 device->wakeup.flags.run_wake = 1;
823 device_set_wakeup_capable(&device->dev, true);
827 status = acpi_get_gpe_status(device->wakeup.gpe_device,
828 device->wakeup.gpe_number,
831 device->wakeup.flags.run_wake =
832 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
835 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
838 acpi_status status = 0;
841 /* Presence of _PRW indicates wake capable */
842 status = acpi_get_handle(device->handle, "_PRW", &temp);
843 if (ACPI_FAILURE(status))
846 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
848 if (ACPI_FAILURE(status)) {
849 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
853 device->wakeup.flags.valid = 1;
854 device->wakeup.prepare_count = 0;
855 acpi_bus_set_run_wake_flags(device);
856 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
857 * system for the ACPI device with the _PRW object.
858 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
859 * So it is necessary to call _DSW object first. Only when it is not
860 * present will the _PSW object used.
862 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
864 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
865 "error in _DSW or _PSW evaluation\n"));
868 static void acpi_bus_add_power_resource(acpi_handle handle);
870 static int acpi_bus_get_power_flags(struct acpi_device *device)
872 acpi_status status = 0;
873 acpi_handle handle = NULL;
878 * Power Management Flags
880 status = acpi_get_handle(device->handle, "_PSC", &handle);
881 if (ACPI_SUCCESS(status))
882 device->power.flags.explicit_get = 1;
883 status = acpi_get_handle(device->handle, "_IRC", &handle);
884 if (ACPI_SUCCESS(status))
885 device->power.flags.inrush_current = 1;
888 * Enumerate supported power management states
890 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
891 struct acpi_device_power_state *ps = &device->power.states[i];
892 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
894 /* Evaluate "_PRx" to se if power resources are referenced */
895 acpi_evaluate_reference(device->handle, object_name, NULL,
897 if (ps->resources.count) {
900 device->power.flags.power_resources = 1;
901 for (j = 0; j < ps->resources.count; j++)
902 acpi_bus_add_power_resource(ps->resources.handles[j]);
905 /* Evaluate "_PSx" to see if we can do explicit sets */
906 object_name[2] = 'S';
907 status = acpi_get_handle(device->handle, object_name, &handle);
908 if (ACPI_SUCCESS(status))
909 ps->flags.explicit_set = 1;
912 * State is valid if there are means to put the device into it.
913 * D3hot is only valid if _PR3 present.
915 if (ps->resources.count ||
916 (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
919 ps->power = -1; /* Unknown - driver assigned */
920 ps->latency = -1; /* Unknown - driver assigned */
923 /* Set defaults for D0 and D3 states (always valid) */
924 device->power.states[ACPI_STATE_D0].flags.valid = 1;
925 device->power.states[ACPI_STATE_D0].power = 100;
926 device->power.states[ACPI_STATE_D3].flags.valid = 1;
927 device->power.states[ACPI_STATE_D3].power = 0;
929 /* Set D3cold's explicit_set flag if _PS3 exists. */
930 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
931 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
933 acpi_bus_init_power(device);
938 static int acpi_bus_get_flags(struct acpi_device *device)
940 acpi_status status = AE_OK;
941 acpi_handle temp = NULL;
944 /* Presence of _STA indicates 'dynamic_status' */
945 status = acpi_get_handle(device->handle, "_STA", &temp);
946 if (ACPI_SUCCESS(status))
947 device->flags.dynamic_status = 1;
949 /* Presence of _RMV indicates 'removable' */
950 status = acpi_get_handle(device->handle, "_RMV", &temp);
951 if (ACPI_SUCCESS(status))
952 device->flags.removable = 1;
954 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
955 status = acpi_get_handle(device->handle, "_EJD", &temp);
956 if (ACPI_SUCCESS(status))
957 device->flags.ejectable = 1;
959 status = acpi_get_handle(device->handle, "_EJ0", &temp);
960 if (ACPI_SUCCESS(status))
961 device->flags.ejectable = 1;
964 /* Presence of _LCK indicates 'lockable' */
965 status = acpi_get_handle(device->handle, "_LCK", &temp);
966 if (ACPI_SUCCESS(status))
967 device->flags.lockable = 1;
969 /* Power resources cannot be power manageable. */
970 if (device->device_type == ACPI_BUS_TYPE_POWER)
973 /* Presence of _PS0|_PR0 indicates 'power manageable' */
974 status = acpi_get_handle(device->handle, "_PS0", &temp);
975 if (ACPI_FAILURE(status))
976 status = acpi_get_handle(device->handle, "_PR0", &temp);
977 if (ACPI_SUCCESS(status))
978 device->flags.power_manageable = 1;
980 /* TBD: Performance management */
985 static void acpi_device_get_busid(struct acpi_device *device)
987 char bus_id[5] = { '?', 0 };
988 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
994 * The device's Bus ID is simply the object name.
995 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
997 if (ACPI_IS_ROOT_DEVICE(device)) {
998 strcpy(device->pnp.bus_id, "ACPI");
1002 switch (device->device_type) {
1003 case ACPI_BUS_TYPE_POWER_BUTTON:
1004 strcpy(device->pnp.bus_id, "PWRF");
1006 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1007 strcpy(device->pnp.bus_id, "SLPF");
1010 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1011 /* Clean up trailing underscores (if any) */
1012 for (i = 3; i > 1; i--) {
1013 if (bus_id[i] == '_')
1018 strcpy(device->pnp.bus_id, bus_id);
1024 * acpi_bay_match - see if a device is an ejectable driver bay
1026 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1027 * then we can safely call it an ejectable drive bay
1029 static int acpi_bay_match(struct acpi_device *device){
1033 acpi_handle phandle;
1035 handle = device->handle;
1037 status = acpi_get_handle(handle, "_EJ0", &tmp);
1038 if (ACPI_FAILURE(status))
1041 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1042 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1043 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1044 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1047 if (acpi_get_parent(handle, &phandle))
1050 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1051 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1052 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1053 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1060 * acpi_dock_match - see if a device has a _DCK method
1062 static int acpi_dock_match(struct acpi_device *device)
1065 return acpi_get_handle(device->handle, "_DCK", &tmp);
1068 const char *acpi_device_hid(struct acpi_device *device)
1070 struct acpi_hardware_id *hid;
1072 if (list_empty(&device->pnp.ids))
1075 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1078 EXPORT_SYMBOL(acpi_device_hid);
1080 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1082 struct acpi_hardware_id *id;
1084 id = kmalloc(sizeof(*id), GFP_KERNEL);
1088 id->id = kstrdup(dev_id, GFP_KERNEL);
1094 list_add_tail(&id->list, &device->pnp.ids);
1098 * Old IBM workstations have a DSDT bug wherein the SMBus object
1099 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1100 * prefix. Work around this.
1102 static int acpi_ibm_smbus_match(struct acpi_device *device)
1104 acpi_handle h_dummy;
1105 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1108 if (!dmi_name_in_vendors("IBM"))
1111 /* Look for SMBS object */
1112 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1116 if (strcmp("SMBS", path.pointer)) {
1121 /* Does it have the necessary (but misnamed) methods? */
1123 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1124 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1125 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1128 kfree(path.pointer);
1132 static void acpi_device_set_id(struct acpi_device *device)
1135 struct acpi_device_info *info;
1136 struct acpica_device_id_list *cid_list;
1139 switch (device->device_type) {
1140 case ACPI_BUS_TYPE_DEVICE:
1141 if (ACPI_IS_ROOT_DEVICE(device)) {
1142 acpi_add_id(device, ACPI_SYSTEM_HID);
1146 status = acpi_get_object_info(device->handle, &info);
1147 if (ACPI_FAILURE(status)) {
1148 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1152 if (info->valid & ACPI_VALID_HID)
1153 acpi_add_id(device, info->hardware_id.string);
1154 if (info->valid & ACPI_VALID_CID) {
1155 cid_list = &info->compatible_id_list;
1156 for (i = 0; i < cid_list->count; i++)
1157 acpi_add_id(device, cid_list->ids[i].string);
1159 if (info->valid & ACPI_VALID_ADR) {
1160 device->pnp.bus_address = info->address;
1161 device->flags.bus_address = 1;
1167 * Some devices don't reliably have _HIDs & _CIDs, so add
1168 * synthetic HIDs to make sure drivers can find them.
1170 if (acpi_is_video_device(device))
1171 acpi_add_id(device, ACPI_VIDEO_HID);
1172 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1173 acpi_add_id(device, ACPI_BAY_HID);
1174 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1175 acpi_add_id(device, ACPI_DOCK_HID);
1176 else if (!acpi_ibm_smbus_match(device))
1177 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1178 else if (!acpi_device_hid(device) &&
1179 ACPI_IS_ROOT_DEVICE(device->parent)) {
1180 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1181 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1182 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1186 case ACPI_BUS_TYPE_POWER:
1187 acpi_add_id(device, ACPI_POWER_HID);
1189 case ACPI_BUS_TYPE_PROCESSOR:
1190 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1192 case ACPI_BUS_TYPE_THERMAL:
1193 acpi_add_id(device, ACPI_THERMAL_HID);
1195 case ACPI_BUS_TYPE_POWER_BUTTON:
1196 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1198 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1199 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1204 static int acpi_device_set_context(struct acpi_device *device)
1211 * Attach this 'struct acpi_device' to the ACPI object. This makes
1212 * resolutions from handle->device very efficient. Fixed hardware
1213 * devices have no handles, so we skip them.
1215 if (!device->handle)
1218 status = acpi_attach_data(device->handle,
1219 acpi_bus_data_handler, device);
1220 if (ACPI_SUCCESS(status))
1223 printk(KERN_ERR PREFIX "Error attaching device data\n");
1227 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1232 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1233 device_release_driver(&dev->dev);
1239 * unbind _ADR-Based Devices when hot removal
1241 if (dev->flags.bus_address) {
1242 if ((dev->parent) && (dev->parent->ops.unbind))
1243 dev->parent->ops.unbind(dev);
1245 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1250 static int acpi_add_single_object(struct acpi_device **child,
1251 acpi_handle handle, int type,
1252 unsigned long long sta,
1253 struct acpi_bus_ops *ops)
1256 struct acpi_device *device;
1257 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1259 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1261 printk(KERN_ERR PREFIX "Memory allocation error\n");
1265 INIT_LIST_HEAD(&device->pnp.ids);
1266 device->device_type = type;
1267 device->handle = handle;
1268 device->parent = acpi_bus_get_parent(handle);
1269 device->bus_ops = *ops; /* workround for not call .start */
1270 STRUCT_TO_INT(device->status) = sta;
1272 acpi_device_get_busid(device);
1277 * Note that we only look for object handles -- cannot evaluate objects
1278 * until we know the device is present and properly initialized.
1280 result = acpi_bus_get_flags(device);
1287 * TBD: Synch with Core's enumeration/initialization process.
1289 acpi_device_set_id(device);
1295 if (device->flags.power_manageable) {
1296 result = acpi_bus_get_power_flags(device);
1302 * Wakeup device management
1303 *-----------------------
1305 acpi_bus_get_wakeup_device_flags(device);
1308 * Performance Management
1309 * ----------------------
1311 if (device->flags.performance_manageable) {
1312 result = acpi_bus_get_perf_flags(device);
1317 if ((result = acpi_device_set_context(device)))
1320 result = acpi_device_register(device);
1323 * Bind _ADR-Based Devices when hot add
1325 if (device->flags.bus_address) {
1326 if (device->parent && device->parent->ops.bind)
1327 device->parent->ops.bind(device);
1332 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1333 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1334 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1335 (char *) buffer.pointer,
1336 device->parent ? dev_name(&device->parent->dev) :
1338 kfree(buffer.pointer);
1341 acpi_device_release(&device->dev);
1346 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1347 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1349 static void acpi_bus_add_power_resource(acpi_handle handle)
1351 struct acpi_bus_ops ops = {
1355 struct acpi_device *device = NULL;
1357 acpi_bus_get_device(handle, &device);
1359 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1360 ACPI_STA_DEFAULT, &ops);
1363 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1364 unsigned long long *sta)
1367 acpi_object_type acpi_type;
1369 status = acpi_get_type(handle, &acpi_type);
1370 if (ACPI_FAILURE(status))
1373 switch (acpi_type) {
1374 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1375 case ACPI_TYPE_DEVICE:
1376 *type = ACPI_BUS_TYPE_DEVICE;
1377 status = acpi_bus_get_status_handle(handle, sta);
1378 if (ACPI_FAILURE(status))
1381 case ACPI_TYPE_PROCESSOR:
1382 *type = ACPI_BUS_TYPE_PROCESSOR;
1383 status = acpi_bus_get_status_handle(handle, sta);
1384 if (ACPI_FAILURE(status))
1387 case ACPI_TYPE_THERMAL:
1388 *type = ACPI_BUS_TYPE_THERMAL;
1389 *sta = ACPI_STA_DEFAULT;
1391 case ACPI_TYPE_POWER:
1392 *type = ACPI_BUS_TYPE_POWER;
1393 *sta = ACPI_STA_DEFAULT;
1402 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1403 void *context, void **return_value)
1405 struct acpi_bus_ops *ops = context;
1407 unsigned long long sta;
1408 struct acpi_device *device;
1412 result = acpi_bus_type_and_status(handle, &type, &sta);
1416 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1417 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1418 struct acpi_device_wakeup wakeup;
1421 status = acpi_get_handle(handle, "_PRW", &temp);
1422 if (ACPI_SUCCESS(status))
1423 acpi_bus_extract_wakeup_device_power_package(handle,
1425 return AE_CTRL_DEPTH;
1429 * We may already have an acpi_device from a previous enumeration. If
1430 * so, we needn't add it again, but we may still have to start it.
1433 acpi_bus_get_device(handle, &device);
1434 if (ops->acpi_op_add && !device)
1435 acpi_add_single_object(&device, handle, type, sta, ops);
1438 return AE_CTRL_DEPTH;
1440 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1441 status = acpi_start_single_object(device);
1442 if (ACPI_FAILURE(status))
1443 return AE_CTRL_DEPTH;
1447 *return_value = device;
1451 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1452 struct acpi_device **child)
1455 void *device = NULL;
1457 status = acpi_bus_check_add(handle, 0, ops, &device);
1458 if (ACPI_SUCCESS(status))
1459 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1460 acpi_bus_check_add, NULL, ops, &device);
1472 * acpi_bus_add and acpi_bus_start
1474 * scan a given ACPI tree and (probably recently hot-plugged)
1475 * create and add or starts found devices.
1477 * If no devices were found -ENODEV is returned which does not
1478 * mean that this is a real error, there just have been no suitable
1479 * ACPI objects in the table trunk from which the kernel could create
1480 * a device and add/start an appropriate driver.
1484 acpi_bus_add(struct acpi_device **child,
1485 struct acpi_device *parent, acpi_handle handle, int type)
1487 struct acpi_bus_ops ops;
1489 memset(&ops, 0, sizeof(ops));
1490 ops.acpi_op_add = 1;
1492 return acpi_bus_scan(handle, &ops, child);
1494 EXPORT_SYMBOL(acpi_bus_add);
1496 int acpi_bus_start(struct acpi_device *device)
1498 struct acpi_bus_ops ops;
1504 memset(&ops, 0, sizeof(ops));
1505 ops.acpi_op_start = 1;
1507 result = acpi_bus_scan(device->handle, &ops, NULL);
1509 acpi_update_all_gpes();
1513 EXPORT_SYMBOL(acpi_bus_start);
1515 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1518 struct acpi_device *parent, *child;
1519 acpi_handle phandle, chandle;
1520 acpi_object_type type;
1525 phandle = start->handle;
1526 child = chandle = NULL;
1528 while ((level > 0) && parent && (!err)) {
1529 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1533 * If this scope is exhausted then move our way back up.
1535 if (ACPI_FAILURE(status)) {
1538 acpi_get_parent(phandle, &phandle);
1540 parent = parent->parent;
1543 err = acpi_bus_remove(child, rmdevice);
1545 err = acpi_bus_remove(child, 1);
1550 status = acpi_get_type(chandle, &type);
1551 if (ACPI_FAILURE(status)) {
1555 * If there is a device corresponding to chandle then
1556 * parse it (depth-first).
1558 if (acpi_bus_get_device(chandle, &child) == 0) {
1568 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1570 static int acpi_bus_scan_fixed(void)
1573 struct acpi_device *device = NULL;
1574 struct acpi_bus_ops ops;
1576 memset(&ops, 0, sizeof(ops));
1577 ops.acpi_op_add = 1;
1578 ops.acpi_op_start = 1;
1581 * Enumerate all fixed-feature devices.
1583 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1584 result = acpi_add_single_object(&device, NULL,
1585 ACPI_BUS_TYPE_POWER_BUTTON,
1588 device_init_wakeup(&device->dev, true);
1591 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1592 result = acpi_add_single_object(&device, NULL,
1593 ACPI_BUS_TYPE_SLEEP_BUTTON,
1601 int __init acpi_scan_init(void)
1604 struct acpi_bus_ops ops;
1606 memset(&ops, 0, sizeof(ops));
1607 ops.acpi_op_add = 1;
1608 ops.acpi_op_start = 1;
1610 result = bus_register(&acpi_bus_type);
1612 /* We don't want to quit even if we failed to add suspend/resume */
1613 printk(KERN_ERR PREFIX "Could not register bus type\n");
1619 * Enumerate devices in the ACPI namespace.
1621 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1624 result = acpi_bus_scan_fixed();
1627 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1629 acpi_update_all_gpes();