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_device_suspend(struct device *dev, pm_message_t state)
335 struct acpi_device *acpi_dev = to_acpi_device(dev);
336 struct acpi_driver *acpi_drv = acpi_dev->driver;
338 if (acpi_drv && acpi_drv->ops.suspend)
339 return acpi_drv->ops.suspend(acpi_dev, state);
343 static int acpi_device_resume(struct device *dev)
345 struct acpi_device *acpi_dev = to_acpi_device(dev);
346 struct acpi_driver *acpi_drv = acpi_dev->driver;
348 if (acpi_drv && acpi_drv->ops.resume)
349 return acpi_drv->ops.resume(acpi_dev);
353 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
355 struct acpi_device *acpi_dev = to_acpi_device(dev);
356 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
358 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
361 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
363 struct acpi_device *acpi_dev = to_acpi_device(dev);
366 if (list_empty(&acpi_dev->pnp.ids))
369 if (add_uevent_var(env, "MODALIAS="))
371 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
372 sizeof(env->buf) - env->buflen);
373 if (len >= (sizeof(env->buf) - env->buflen))
379 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
381 struct acpi_device *device = data;
383 device->driver->ops.notify(device, event);
386 static acpi_status acpi_device_notify_fixed(void *data)
388 struct acpi_device *device = data;
390 /* Fixed hardware devices have no handles */
391 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
395 static int acpi_device_install_notify_handler(struct acpi_device *device)
399 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
401 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
402 acpi_device_notify_fixed,
404 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
406 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
407 acpi_device_notify_fixed,
410 status = acpi_install_notify_handler(device->handle,
415 if (ACPI_FAILURE(status))
420 static void acpi_device_remove_notify_handler(struct acpi_device *device)
422 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
423 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
424 acpi_device_notify_fixed);
425 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
426 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
427 acpi_device_notify_fixed);
429 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
433 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
434 static int acpi_start_single_object(struct acpi_device *);
435 static int acpi_device_probe(struct device * dev)
437 struct acpi_device *acpi_dev = to_acpi_device(dev);
438 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
441 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
443 if (acpi_dev->bus_ops.acpi_op_start)
444 acpi_start_single_object(acpi_dev);
446 if (acpi_drv->ops.notify) {
447 ret = acpi_device_install_notify_handler(acpi_dev);
449 if (acpi_drv->ops.remove)
450 acpi_drv->ops.remove(acpi_dev,
451 acpi_dev->removal_type);
456 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
457 "Found driver [%s] for device [%s]\n",
458 acpi_drv->name, acpi_dev->pnp.bus_id));
464 static int acpi_device_remove(struct device * dev)
466 struct acpi_device *acpi_dev = to_acpi_device(dev);
467 struct acpi_driver *acpi_drv = acpi_dev->driver;
470 if (acpi_drv->ops.notify)
471 acpi_device_remove_notify_handler(acpi_dev);
472 if (acpi_drv->ops.remove)
473 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
475 acpi_dev->driver = NULL;
476 acpi_dev->driver_data = NULL;
482 struct bus_type acpi_bus_type = {
484 .suspend = acpi_device_suspend,
485 .resume = acpi_device_resume,
486 .match = acpi_bus_match,
487 .probe = acpi_device_probe,
488 .remove = acpi_device_remove,
489 .uevent = acpi_device_uevent,
492 static int acpi_device_register(struct acpi_device *device)
495 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
501 * Link this device to its parent and siblings.
503 INIT_LIST_HEAD(&device->children);
504 INIT_LIST_HEAD(&device->node);
505 INIT_LIST_HEAD(&device->wakeup_list);
507 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
509 printk(KERN_ERR PREFIX "Memory allocation error\n");
513 mutex_lock(&acpi_device_lock);
515 * Find suitable bus_id and instance number in acpi_bus_id_list
516 * If failed, create one and link it into acpi_bus_id_list
518 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
519 if (!strcmp(acpi_device_bus_id->bus_id,
520 acpi_device_hid(device))) {
521 acpi_device_bus_id->instance_no++;
528 acpi_device_bus_id = new_bus_id;
529 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
530 acpi_device_bus_id->instance_no = 0;
531 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
533 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
536 list_add_tail(&device->node, &device->parent->children);
538 if (device->wakeup.flags.valid)
539 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
540 mutex_unlock(&acpi_device_lock);
543 device->dev.parent = &device->parent->dev;
544 device->dev.bus = &acpi_bus_type;
545 device->dev.release = &acpi_device_release;
546 result = device_register(&device->dev);
548 dev_err(&device->dev, "Error registering device\n");
552 result = acpi_device_setup_files(device);
554 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
555 dev_name(&device->dev));
557 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
560 mutex_lock(&acpi_device_lock);
562 list_del(&device->node);
563 list_del(&device->wakeup_list);
564 mutex_unlock(&acpi_device_lock);
568 static void acpi_device_unregister(struct acpi_device *device, int type)
570 mutex_lock(&acpi_device_lock);
572 list_del(&device->node);
574 list_del(&device->wakeup_list);
575 mutex_unlock(&acpi_device_lock);
577 acpi_detach_data(device->handle, acpi_bus_data_handler);
579 acpi_device_remove_files(device);
580 device_unregister(&device->dev);
583 /* --------------------------------------------------------------------------
585 -------------------------------------------------------------------------- */
587 * acpi_bus_driver_init - add a device to a driver
588 * @device: the device to add and initialize
589 * @driver: driver for the device
591 * Used to initialize a device via its device driver. Called whenever a
592 * driver is bound to a device. Invokes the driver's add() ops.
595 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
599 if (!device || !driver)
602 if (!driver->ops.add)
605 result = driver->ops.add(device);
607 device->driver = NULL;
608 device->driver_data = NULL;
612 device->driver = driver;
615 * TBD - Configuration Management: Assign resources to device based
616 * upon possible configuration and currently allocated resources.
619 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
620 "Driver successfully bound to device\n"));
624 static int acpi_start_single_object(struct acpi_device *device)
627 struct acpi_driver *driver;
630 if (!(driver = device->driver))
633 if (driver->ops.start) {
634 result = driver->ops.start(device);
635 if (result && driver->ops.remove)
636 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
643 * acpi_bus_register_driver - register a driver with the ACPI bus
644 * @driver: driver being registered
646 * Registers a driver with the ACPI bus. Searches the namespace for all
647 * devices that match the driver's criteria and binds. Returns zero for
648 * success or a negative error status for failure.
650 int acpi_bus_register_driver(struct acpi_driver *driver)
656 driver->drv.name = driver->name;
657 driver->drv.bus = &acpi_bus_type;
658 driver->drv.owner = driver->owner;
660 ret = driver_register(&driver->drv);
664 EXPORT_SYMBOL(acpi_bus_register_driver);
667 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
668 * @driver: driver to unregister
670 * Unregisters a driver with the ACPI bus. Searches the namespace for all
671 * devices that match the driver's criteria and unbinds.
673 void acpi_bus_unregister_driver(struct acpi_driver *driver)
675 driver_unregister(&driver->drv);
678 EXPORT_SYMBOL(acpi_bus_unregister_driver);
680 /* --------------------------------------------------------------------------
682 -------------------------------------------------------------------------- */
683 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
687 struct acpi_device *device;
690 * Fixed hardware devices do not appear in the namespace and do not
691 * have handles, but we fabricate acpi_devices for them, so we have
692 * to deal with them specially.
698 status = acpi_get_parent(handle, &handle);
699 if (status == AE_NULL_ENTRY)
701 if (ACPI_FAILURE(status))
704 ret = acpi_bus_get_device(handle, &device);
711 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
715 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
716 union acpi_object *obj;
718 status = acpi_get_handle(handle, "_EJD", &tmp);
719 if (ACPI_FAILURE(status))
722 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
723 if (ACPI_SUCCESS(status)) {
724 obj = buffer.pointer;
725 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
727 kfree(buffer.pointer);
731 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
733 void acpi_bus_data_handler(acpi_handle handle, void *context)
741 static int acpi_bus_get_perf_flags(struct acpi_device *device)
743 device->performance.state = ACPI_STATE_UNKNOWN;
748 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
749 struct acpi_device_wakeup *wakeup)
751 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
752 union acpi_object *package = NULL;
753 union acpi_object *element = NULL;
758 return AE_BAD_PARAMETER;
761 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
762 if (ACPI_FAILURE(status)) {
763 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
767 package = (union acpi_object *)buffer.pointer;
769 if (!package || (package->package.count < 2)) {
770 status = AE_BAD_DATA;
774 element = &(package->package.elements[0]);
776 status = AE_BAD_DATA;
779 if (element->type == ACPI_TYPE_PACKAGE) {
780 if ((element->package.count < 2) ||
781 (element->package.elements[0].type !=
782 ACPI_TYPE_LOCAL_REFERENCE)
783 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
784 status = AE_BAD_DATA;
788 element->package.elements[0].reference.handle;
790 (u32) element->package.elements[1].integer.value;
791 } else if (element->type == ACPI_TYPE_INTEGER) {
792 wakeup->gpe_device = NULL;
793 wakeup->gpe_number = element->integer.value;
795 status = AE_BAD_DATA;
799 element = &(package->package.elements[1]);
800 if (element->type != ACPI_TYPE_INTEGER) {
801 status = AE_BAD_DATA;
804 wakeup->sleep_state = element->integer.value;
806 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
807 status = AE_NO_MEMORY;
810 wakeup->resources.count = package->package.count - 2;
811 for (i = 0; i < wakeup->resources.count; i++) {
812 element = &(package->package.elements[i + 2]);
813 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
814 status = AE_BAD_DATA;
818 wakeup->resources.handles[i] = element->reference.handle;
821 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
824 kfree(buffer.pointer);
829 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
831 struct acpi_device_id button_device_ids[] = {
838 acpi_event_status event_status;
840 device->wakeup.flags.notifier_present = 0;
842 /* Power button, Lid switch always enable wakeup */
843 if (!acpi_match_device_ids(device, button_device_ids)) {
844 device->wakeup.flags.run_wake = 1;
845 device_set_wakeup_capable(&device->dev, true);
849 status = acpi_get_gpe_status(device->wakeup.gpe_device,
850 device->wakeup.gpe_number,
853 device->wakeup.flags.run_wake =
854 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
857 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
860 acpi_status status = 0;
863 /* Presence of _PRW indicates wake capable */
864 status = acpi_get_handle(device->handle, "_PRW", &temp);
865 if (ACPI_FAILURE(status))
868 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
870 if (ACPI_FAILURE(status)) {
871 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
875 device->wakeup.flags.valid = 1;
876 device->wakeup.prepare_count = 0;
877 acpi_bus_set_run_wake_flags(device);
878 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
879 * system for the ACPI device with the _PRW object.
880 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
881 * So it is necessary to call _DSW object first. Only when it is not
882 * present will the _PSW object used.
884 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
886 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
887 "error in _DSW or _PSW evaluation\n"));
890 static void acpi_bus_add_power_resource(acpi_handle handle);
892 static int acpi_bus_get_power_flags(struct acpi_device *device)
894 acpi_status status = 0;
895 acpi_handle handle = NULL;
900 * Power Management Flags
902 status = acpi_get_handle(device->handle, "_PSC", &handle);
903 if (ACPI_SUCCESS(status))
904 device->power.flags.explicit_get = 1;
905 status = acpi_get_handle(device->handle, "_IRC", &handle);
906 if (ACPI_SUCCESS(status))
907 device->power.flags.inrush_current = 1;
910 * Enumerate supported power management states
912 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
913 struct acpi_device_power_state *ps = &device->power.states[i];
914 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
916 /* Evaluate "_PRx" to se if power resources are referenced */
917 acpi_evaluate_reference(device->handle, object_name, NULL,
919 if (ps->resources.count) {
922 device->power.flags.power_resources = 1;
923 for (j = 0; j < ps->resources.count; j++)
924 acpi_bus_add_power_resource(ps->resources.handles[j]);
927 /* Evaluate "_PSx" to see if we can do explicit sets */
928 object_name[2] = 'S';
929 status = acpi_get_handle(device->handle, object_name, &handle);
930 if (ACPI_SUCCESS(status))
931 ps->flags.explicit_set = 1;
934 * State is valid if there are means to put the device into it.
935 * D3hot is only valid if _PR3 present.
937 if (ps->resources.count ||
938 (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
941 ps->power = -1; /* Unknown - driver assigned */
942 ps->latency = -1; /* Unknown - driver assigned */
945 /* Set defaults for D0 and D3 states (always valid) */
946 device->power.states[ACPI_STATE_D0].flags.valid = 1;
947 device->power.states[ACPI_STATE_D0].power = 100;
948 device->power.states[ACPI_STATE_D3].flags.valid = 1;
949 device->power.states[ACPI_STATE_D3].power = 0;
951 /* Set D3cold's explicit_set flag if _PS3 exists. */
952 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
953 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
955 acpi_bus_init_power(device);
960 static int acpi_bus_get_flags(struct acpi_device *device)
962 acpi_status status = AE_OK;
963 acpi_handle temp = NULL;
966 /* Presence of _STA indicates 'dynamic_status' */
967 status = acpi_get_handle(device->handle, "_STA", &temp);
968 if (ACPI_SUCCESS(status))
969 device->flags.dynamic_status = 1;
971 /* Presence of _RMV indicates 'removable' */
972 status = acpi_get_handle(device->handle, "_RMV", &temp);
973 if (ACPI_SUCCESS(status))
974 device->flags.removable = 1;
976 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
977 status = acpi_get_handle(device->handle, "_EJD", &temp);
978 if (ACPI_SUCCESS(status))
979 device->flags.ejectable = 1;
981 status = acpi_get_handle(device->handle, "_EJ0", &temp);
982 if (ACPI_SUCCESS(status))
983 device->flags.ejectable = 1;
986 /* Presence of _LCK indicates 'lockable' */
987 status = acpi_get_handle(device->handle, "_LCK", &temp);
988 if (ACPI_SUCCESS(status))
989 device->flags.lockable = 1;
991 /* Power resources cannot be power manageable. */
992 if (device->device_type == ACPI_BUS_TYPE_POWER)
995 /* Presence of _PS0|_PR0 indicates 'power manageable' */
996 status = acpi_get_handle(device->handle, "_PS0", &temp);
997 if (ACPI_FAILURE(status))
998 status = acpi_get_handle(device->handle, "_PR0", &temp);
999 if (ACPI_SUCCESS(status))
1000 device->flags.power_manageable = 1;
1002 /* TBD: Performance management */
1007 static void acpi_device_get_busid(struct acpi_device *device)
1009 char bus_id[5] = { '?', 0 };
1010 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1016 * The device's Bus ID is simply the object name.
1017 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1019 if (ACPI_IS_ROOT_DEVICE(device)) {
1020 strcpy(device->pnp.bus_id, "ACPI");
1024 switch (device->device_type) {
1025 case ACPI_BUS_TYPE_POWER_BUTTON:
1026 strcpy(device->pnp.bus_id, "PWRF");
1028 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1029 strcpy(device->pnp.bus_id, "SLPF");
1032 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1033 /* Clean up trailing underscores (if any) */
1034 for (i = 3; i > 1; i--) {
1035 if (bus_id[i] == '_')
1040 strcpy(device->pnp.bus_id, bus_id);
1046 * acpi_bay_match - see if a device is an ejectable driver bay
1048 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1049 * then we can safely call it an ejectable drive bay
1051 static int acpi_bay_match(struct acpi_device *device){
1055 acpi_handle phandle;
1057 handle = device->handle;
1059 status = acpi_get_handle(handle, "_EJ0", &tmp);
1060 if (ACPI_FAILURE(status))
1063 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1064 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1065 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1066 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1069 if (acpi_get_parent(handle, &phandle))
1072 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1073 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1074 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1075 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1082 * acpi_dock_match - see if a device has a _DCK method
1084 static int acpi_dock_match(struct acpi_device *device)
1087 return acpi_get_handle(device->handle, "_DCK", &tmp);
1090 const char *acpi_device_hid(struct acpi_device *device)
1092 struct acpi_hardware_id *hid;
1094 if (list_empty(&device->pnp.ids))
1097 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1100 EXPORT_SYMBOL(acpi_device_hid);
1102 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1104 struct acpi_hardware_id *id;
1106 id = kmalloc(sizeof(*id), GFP_KERNEL);
1110 id->id = kstrdup(dev_id, GFP_KERNEL);
1116 list_add_tail(&id->list, &device->pnp.ids);
1120 * Old IBM workstations have a DSDT bug wherein the SMBus object
1121 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1122 * prefix. Work around this.
1124 static int acpi_ibm_smbus_match(struct acpi_device *device)
1126 acpi_handle h_dummy;
1127 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1130 if (!dmi_name_in_vendors("IBM"))
1133 /* Look for SMBS object */
1134 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1138 if (strcmp("SMBS", path.pointer)) {
1143 /* Does it have the necessary (but misnamed) methods? */
1145 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1146 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1147 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1150 kfree(path.pointer);
1154 static void acpi_device_set_id(struct acpi_device *device)
1157 struct acpi_device_info *info;
1158 struct acpica_device_id_list *cid_list;
1161 switch (device->device_type) {
1162 case ACPI_BUS_TYPE_DEVICE:
1163 if (ACPI_IS_ROOT_DEVICE(device)) {
1164 acpi_add_id(device, ACPI_SYSTEM_HID);
1168 status = acpi_get_object_info(device->handle, &info);
1169 if (ACPI_FAILURE(status)) {
1170 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1174 if (info->valid & ACPI_VALID_HID)
1175 acpi_add_id(device, info->hardware_id.string);
1176 if (info->valid & ACPI_VALID_CID) {
1177 cid_list = &info->compatible_id_list;
1178 for (i = 0; i < cid_list->count; i++)
1179 acpi_add_id(device, cid_list->ids[i].string);
1181 if (info->valid & ACPI_VALID_ADR) {
1182 device->pnp.bus_address = info->address;
1183 device->flags.bus_address = 1;
1189 * Some devices don't reliably have _HIDs & _CIDs, so add
1190 * synthetic HIDs to make sure drivers can find them.
1192 if (acpi_is_video_device(device))
1193 acpi_add_id(device, ACPI_VIDEO_HID);
1194 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1195 acpi_add_id(device, ACPI_BAY_HID);
1196 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1197 acpi_add_id(device, ACPI_DOCK_HID);
1198 else if (!acpi_ibm_smbus_match(device))
1199 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1200 else if (!acpi_device_hid(device) &&
1201 ACPI_IS_ROOT_DEVICE(device->parent)) {
1202 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1203 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1204 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1208 case ACPI_BUS_TYPE_POWER:
1209 acpi_add_id(device, ACPI_POWER_HID);
1211 case ACPI_BUS_TYPE_PROCESSOR:
1212 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1214 case ACPI_BUS_TYPE_THERMAL:
1215 acpi_add_id(device, ACPI_THERMAL_HID);
1217 case ACPI_BUS_TYPE_POWER_BUTTON:
1218 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1220 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1221 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1226 static int acpi_device_set_context(struct acpi_device *device)
1233 * Attach this 'struct acpi_device' to the ACPI object. This makes
1234 * resolutions from handle->device very efficient. Fixed hardware
1235 * devices have no handles, so we skip them.
1237 if (!device->handle)
1240 status = acpi_attach_data(device->handle,
1241 acpi_bus_data_handler, device);
1242 if (ACPI_SUCCESS(status))
1245 printk(KERN_ERR PREFIX "Error attaching device data\n");
1249 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1254 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1255 device_release_driver(&dev->dev);
1261 * unbind _ADR-Based Devices when hot removal
1263 if (dev->flags.bus_address) {
1264 if ((dev->parent) && (dev->parent->ops.unbind))
1265 dev->parent->ops.unbind(dev);
1267 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1272 static int acpi_add_single_object(struct acpi_device **child,
1273 acpi_handle handle, int type,
1274 unsigned long long sta,
1275 struct acpi_bus_ops *ops)
1278 struct acpi_device *device;
1279 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1281 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1283 printk(KERN_ERR PREFIX "Memory allocation error\n");
1287 INIT_LIST_HEAD(&device->pnp.ids);
1288 device->device_type = type;
1289 device->handle = handle;
1290 device->parent = acpi_bus_get_parent(handle);
1291 device->bus_ops = *ops; /* workround for not call .start */
1292 STRUCT_TO_INT(device->status) = sta;
1294 acpi_device_get_busid(device);
1299 * Note that we only look for object handles -- cannot evaluate objects
1300 * until we know the device is present and properly initialized.
1302 result = acpi_bus_get_flags(device);
1309 * TBD: Synch with Core's enumeration/initialization process.
1311 acpi_device_set_id(device);
1317 if (device->flags.power_manageable) {
1318 result = acpi_bus_get_power_flags(device);
1324 * Wakeup device management
1325 *-----------------------
1327 acpi_bus_get_wakeup_device_flags(device);
1330 * Performance Management
1331 * ----------------------
1333 if (device->flags.performance_manageable) {
1334 result = acpi_bus_get_perf_flags(device);
1339 if ((result = acpi_device_set_context(device)))
1342 result = acpi_device_register(device);
1345 * Bind _ADR-Based Devices when hot add
1347 if (device->flags.bus_address) {
1348 if (device->parent && device->parent->ops.bind)
1349 device->parent->ops.bind(device);
1354 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1355 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1356 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1357 (char *) buffer.pointer,
1358 device->parent ? dev_name(&device->parent->dev) :
1360 kfree(buffer.pointer);
1363 acpi_device_release(&device->dev);
1368 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1369 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1371 static void acpi_bus_add_power_resource(acpi_handle handle)
1373 struct acpi_bus_ops ops = {
1377 struct acpi_device *device = NULL;
1379 acpi_bus_get_device(handle, &device);
1381 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1382 ACPI_STA_DEFAULT, &ops);
1385 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1386 unsigned long long *sta)
1389 acpi_object_type acpi_type;
1391 status = acpi_get_type(handle, &acpi_type);
1392 if (ACPI_FAILURE(status))
1395 switch (acpi_type) {
1396 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1397 case ACPI_TYPE_DEVICE:
1398 *type = ACPI_BUS_TYPE_DEVICE;
1399 status = acpi_bus_get_status_handle(handle, sta);
1400 if (ACPI_FAILURE(status))
1403 case ACPI_TYPE_PROCESSOR:
1404 *type = ACPI_BUS_TYPE_PROCESSOR;
1405 status = acpi_bus_get_status_handle(handle, sta);
1406 if (ACPI_FAILURE(status))
1409 case ACPI_TYPE_THERMAL:
1410 *type = ACPI_BUS_TYPE_THERMAL;
1411 *sta = ACPI_STA_DEFAULT;
1413 case ACPI_TYPE_POWER:
1414 *type = ACPI_BUS_TYPE_POWER;
1415 *sta = ACPI_STA_DEFAULT;
1424 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1425 void *context, void **return_value)
1427 struct acpi_bus_ops *ops = context;
1429 unsigned long long sta;
1430 struct acpi_device *device;
1434 result = acpi_bus_type_and_status(handle, &type, &sta);
1438 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1439 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1440 struct acpi_device_wakeup wakeup;
1443 status = acpi_get_handle(handle, "_PRW", &temp);
1444 if (ACPI_SUCCESS(status))
1445 acpi_bus_extract_wakeup_device_power_package(handle,
1447 return AE_CTRL_DEPTH;
1451 * We may already have an acpi_device from a previous enumeration. If
1452 * so, we needn't add it again, but we may still have to start it.
1455 acpi_bus_get_device(handle, &device);
1456 if (ops->acpi_op_add && !device)
1457 acpi_add_single_object(&device, handle, type, sta, ops);
1460 return AE_CTRL_DEPTH;
1462 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1463 status = acpi_start_single_object(device);
1464 if (ACPI_FAILURE(status))
1465 return AE_CTRL_DEPTH;
1469 *return_value = device;
1473 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1474 struct acpi_device **child)
1477 void *device = NULL;
1479 status = acpi_bus_check_add(handle, 0, ops, &device);
1480 if (ACPI_SUCCESS(status))
1481 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1482 acpi_bus_check_add, NULL, ops, &device);
1494 * acpi_bus_add and acpi_bus_start
1496 * scan a given ACPI tree and (probably recently hot-plugged)
1497 * create and add or starts found devices.
1499 * If no devices were found -ENODEV is returned which does not
1500 * mean that this is a real error, there just have been no suitable
1501 * ACPI objects in the table trunk from which the kernel could create
1502 * a device and add/start an appropriate driver.
1506 acpi_bus_add(struct acpi_device **child,
1507 struct acpi_device *parent, acpi_handle handle, int type)
1509 struct acpi_bus_ops ops;
1511 memset(&ops, 0, sizeof(ops));
1512 ops.acpi_op_add = 1;
1514 return acpi_bus_scan(handle, &ops, child);
1516 EXPORT_SYMBOL(acpi_bus_add);
1518 int acpi_bus_start(struct acpi_device *device)
1520 struct acpi_bus_ops ops;
1526 memset(&ops, 0, sizeof(ops));
1527 ops.acpi_op_start = 1;
1529 result = acpi_bus_scan(device->handle, &ops, NULL);
1531 acpi_update_all_gpes();
1535 EXPORT_SYMBOL(acpi_bus_start);
1537 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1540 struct acpi_device *parent, *child;
1541 acpi_handle phandle, chandle;
1542 acpi_object_type type;
1547 phandle = start->handle;
1548 child = chandle = NULL;
1550 while ((level > 0) && parent && (!err)) {
1551 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1555 * If this scope is exhausted then move our way back up.
1557 if (ACPI_FAILURE(status)) {
1560 acpi_get_parent(phandle, &phandle);
1562 parent = parent->parent;
1565 err = acpi_bus_remove(child, rmdevice);
1567 err = acpi_bus_remove(child, 1);
1572 status = acpi_get_type(chandle, &type);
1573 if (ACPI_FAILURE(status)) {
1577 * If there is a device corresponding to chandle then
1578 * parse it (depth-first).
1580 if (acpi_bus_get_device(chandle, &child) == 0) {
1590 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1592 static int acpi_bus_scan_fixed(void)
1595 struct acpi_device *device = NULL;
1596 struct acpi_bus_ops ops;
1598 memset(&ops, 0, sizeof(ops));
1599 ops.acpi_op_add = 1;
1600 ops.acpi_op_start = 1;
1603 * Enumerate all fixed-feature devices.
1605 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1606 result = acpi_add_single_object(&device, NULL,
1607 ACPI_BUS_TYPE_POWER_BUTTON,
1610 device_init_wakeup(&device->dev, true);
1613 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1614 result = acpi_add_single_object(&device, NULL,
1615 ACPI_BUS_TYPE_SLEEP_BUTTON,
1623 int __init acpi_scan_init(void)
1626 struct acpi_bus_ops ops;
1628 memset(&ops, 0, sizeof(ops));
1629 ops.acpi_op_add = 1;
1630 ops.acpi_op_start = 1;
1632 result = bus_register(&acpi_bus_type);
1634 /* We don't want to quit even if we failed to add suspend/resume */
1635 printk(KERN_ERR PREFIX "Could not register bus type\n");
1641 * Enumerate devices in the ACPI namespace.
1643 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1646 result = acpi_bus_scan_fixed();
1649 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1651 acpi_update_all_gpes();