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>
13 #include <linux/nls.h>
15 #include <acpi/acpi_drivers.h>
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 #define STRUCT_TO_INT(s) (*((int*)&s))
22 extern struct acpi_device
*acpi_root
;
24 #define ACPI_BUS_CLASS "system_bus"
25 #define ACPI_BUS_HID "LNXSYBUS"
26 #define ACPI_BUS_DEVICE_NAME "System Bus"
28 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
30 static const char *dummy_hid
= "device";
33 * The following ACPI IDs are known to be suitable for representing as
36 static const struct acpi_device_id acpi_platform_device_ids
[] = {
40 /* Haswell LPSS devices */
53 static LIST_HEAD(acpi_device_list
);
54 static LIST_HEAD(acpi_bus_id_list
);
55 DEFINE_MUTEX(acpi_device_lock
);
56 LIST_HEAD(acpi_wakeup_device_list
);
58 struct acpi_device_bus_id
{
60 unsigned int instance_no
;
61 struct list_head node
;
65 * Creates hid/cid(s) string needed for modalias and uevent
66 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
67 * char *modalias: "acpi:IBM0001:ACPI0001"
69 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
74 struct acpi_hardware_id
*id
;
76 if (list_empty(&acpi_dev
->pnp
.ids
))
79 len
= snprintf(modalias
, size
, "acpi:");
82 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
83 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
84 if (count
< 0 || count
>= size
)
95 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
96 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
99 /* Device has no HID and no CID or string is >1024 */
100 len
= create_modalias(acpi_dev
, buf
, 1024);
106 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
109 * acpi_bus_hot_remove_device: hot-remove a device and its children
110 * @context: struct acpi_eject_event pointer (freed in this func)
112 * Hot-remove a device and its children. This function frees up the
113 * memory space passed by arg context, so that the caller may call
114 * this function asynchronously through acpi_os_hotplug_execute().
116 void acpi_bus_hot_remove_device(void *context
)
118 struct acpi_eject_event
*ej_event
= (struct acpi_eject_event
*) context
;
119 struct acpi_device
*device
= ej_event
->device
;
120 acpi_handle handle
= device
->handle
;
122 struct acpi_object_list arg_list
;
123 union acpi_object arg
;
124 acpi_status status
= AE_OK
;
125 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
; /* default */
127 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
128 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
130 if (acpi_bus_trim(device
)) {
131 printk(KERN_ERR PREFIX
132 "Removing device failed\n");
136 /* device has been freed */
139 /* power off device */
140 status
= acpi_evaluate_object(handle
, "_PS3", NULL
, NULL
);
141 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
)
142 printk(KERN_WARNING PREFIX
143 "Power-off device failed\n");
145 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_LCK", &temp
))) {
147 arg_list
.pointer
= &arg
;
148 arg
.type
= ACPI_TYPE_INTEGER
;
149 arg
.integer
.value
= 0;
150 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
154 arg_list
.pointer
= &arg
;
155 arg
.type
= ACPI_TYPE_INTEGER
;
156 arg
.integer
.value
= 1;
161 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
162 if (ACPI_FAILURE(status
)) {
163 if (status
!= AE_NOT_FOUND
)
164 printk(KERN_WARNING PREFIX
165 "Eject device failed\n");
173 /* Inform firmware the hot-remove operation has completed w/ error */
174 (void) acpi_evaluate_hotplug_ost(handle
,
175 ej_event
->event
, ost_code
, NULL
);
179 EXPORT_SYMBOL(acpi_bus_hot_remove_device
);
182 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
183 const char *buf
, size_t count
)
187 acpi_object_type type
= 0;
188 struct acpi_device
*acpi_device
= to_acpi_device(d
);
189 struct acpi_eject_event
*ej_event
;
191 if ((!count
) || (buf
[0] != '1')) {
195 if (acpi_device
->driver
== NULL
) {
200 status
= acpi_get_type(acpi_device
->handle
, &type
);
201 if (ACPI_FAILURE(status
) || (!acpi_device
->flags
.ejectable
)) {
206 ej_event
= kmalloc(sizeof(*ej_event
), GFP_KERNEL
);
212 ej_event
->device
= acpi_device
;
213 if (acpi_device
->flags
.eject_pending
) {
214 /* event originated from ACPI eject notification */
215 ej_event
->event
= ACPI_NOTIFY_EJECT_REQUEST
;
216 acpi_device
->flags
.eject_pending
= 0;
218 /* event originated from user */
219 ej_event
->event
= ACPI_OST_EC_OSPM_EJECT
;
220 (void) acpi_evaluate_hotplug_ost(acpi_device
->handle
,
221 ej_event
->event
, ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
224 acpi_os_hotplug_execute(acpi_bus_hot_remove_device
, (void *)ej_event
);
229 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
232 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
233 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
235 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
237 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
239 static ssize_t
acpi_device_uid_show(struct device
*dev
,
240 struct device_attribute
*attr
, char *buf
)
242 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
244 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
246 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
248 static ssize_t
acpi_device_adr_show(struct device
*dev
,
249 struct device_attribute
*attr
, char *buf
)
251 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
253 return sprintf(buf
, "0x%08x\n",
254 (unsigned int)(acpi_dev
->pnp
.bus_address
));
256 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
259 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
260 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
261 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
264 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
268 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
273 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
275 /* sysfs file that shows description text from the ACPI _STR method */
276 static ssize_t
description_show(struct device
*dev
,
277 struct device_attribute
*attr
,
279 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
282 if (acpi_dev
->pnp
.str_obj
== NULL
)
286 * The _STR object contains a Unicode identifier for a device.
287 * We need to convert to utf-8 so it can be displayed.
289 result
= utf16s_to_utf8s(
290 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
291 acpi_dev
->pnp
.str_obj
->buffer
.length
,
292 UTF16_LITTLE_ENDIAN
, buf
,
295 buf
[result
++] = '\n';
299 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
302 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
304 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
306 return sprintf(buf
, "%lu\n", acpi_dev
->pnp
.sun
);
308 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
310 static int acpi_device_setup_files(struct acpi_device
*dev
)
312 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
315 unsigned long long sun
;
319 * Devices gotten from FADT don't have a "path" attribute
322 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
327 if (!list_empty(&dev
->pnp
.ids
)) {
328 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
332 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
338 * If device has _STR, 'description' file is created
340 status
= acpi_get_handle(dev
->handle
, "_STR", &temp
);
341 if (ACPI_SUCCESS(status
)) {
342 status
= acpi_evaluate_object(dev
->handle
, "_STR",
344 if (ACPI_FAILURE(status
))
345 buffer
.pointer
= NULL
;
346 dev
->pnp
.str_obj
= buffer
.pointer
;
347 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
352 if (dev
->flags
.bus_address
)
353 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
354 if (dev
->pnp
.unique_id
)
355 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
357 status
= acpi_evaluate_integer(dev
->handle
, "_SUN", NULL
, &sun
);
358 if (ACPI_SUCCESS(status
)) {
359 dev
->pnp
.sun
= (unsigned long)sun
;
360 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
364 dev
->pnp
.sun
= (unsigned long)-1;
368 * If device has _EJ0, 'eject' file is created that is used to trigger
369 * hot-removal function from userland.
371 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
372 if (ACPI_SUCCESS(status
))
373 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
378 static void acpi_device_remove_files(struct acpi_device
*dev
)
384 * If device has _STR, remove 'description' file
386 status
= acpi_get_handle(dev
->handle
, "_STR", &temp
);
387 if (ACPI_SUCCESS(status
)) {
388 kfree(dev
->pnp
.str_obj
);
389 device_remove_file(&dev
->dev
, &dev_attr_description
);
392 * If device has _EJ0, remove 'eject' file.
394 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
395 if (ACPI_SUCCESS(status
))
396 device_remove_file(&dev
->dev
, &dev_attr_eject
);
398 status
= acpi_get_handle(dev
->handle
, "_SUN", &temp
);
399 if (ACPI_SUCCESS(status
))
400 device_remove_file(&dev
->dev
, &dev_attr_sun
);
402 if (dev
->pnp
.unique_id
)
403 device_remove_file(&dev
->dev
, &dev_attr_uid
);
404 if (dev
->flags
.bus_address
)
405 device_remove_file(&dev
->dev
, &dev_attr_adr
);
406 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
407 device_remove_file(&dev
->dev
, &dev_attr_hid
);
409 device_remove_file(&dev
->dev
, &dev_attr_path
);
411 /* --------------------------------------------------------------------------
413 -------------------------------------------------------------------------- */
415 static const struct acpi_device_id
*__acpi_match_device(
416 struct acpi_device
*device
, const struct acpi_device_id
*ids
)
418 const struct acpi_device_id
*id
;
419 struct acpi_hardware_id
*hwid
;
422 * If the device is not present, it is unnecessary to load device
425 if (!device
->status
.present
)
428 for (id
= ids
; id
->id
[0]; id
++)
429 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
430 if (!strcmp((char *) id
->id
, hwid
->id
))
437 * acpi_match_device - Match a struct device against a given list of ACPI IDs
438 * @ids: Array of struct acpi_device_id object to match against.
439 * @dev: The device structure to match.
441 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
442 * object for that handle and use that object to match against a given list of
445 * Return a pointer to the first matching ID on success or %NULL on failure.
447 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
448 const struct device
*dev
)
450 struct acpi_device
*adev
;
452 if (!ids
|| !ACPI_HANDLE(dev
)
453 || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev
), &adev
)))
456 return __acpi_match_device(adev
, ids
);
458 EXPORT_SYMBOL_GPL(acpi_match_device
);
460 int acpi_match_device_ids(struct acpi_device
*device
,
461 const struct acpi_device_id
*ids
)
463 return __acpi_match_device(device
, ids
) ? 0 : -ENOENT
;
465 EXPORT_SYMBOL(acpi_match_device_ids
);
467 static void acpi_free_ids(struct acpi_device
*device
)
469 struct acpi_hardware_id
*id
, *tmp
;
471 list_for_each_entry_safe(id
, tmp
, &device
->pnp
.ids
, list
) {
477 static void acpi_device_release(struct device
*dev
)
479 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
481 acpi_free_ids(acpi_dev
);
482 kfree(acpi_dev
->pnp
.unique_id
);
486 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
488 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
489 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
491 return acpi_dev
->flags
.match_driver
492 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
495 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
497 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
500 if (list_empty(&acpi_dev
->pnp
.ids
))
503 if (add_uevent_var(env
, "MODALIAS="))
505 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
506 sizeof(env
->buf
) - env
->buflen
);
507 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
513 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
515 struct acpi_device
*device
= data
;
517 device
->driver
->ops
.notify(device
, event
);
520 static acpi_status
acpi_device_notify_fixed(void *data
)
522 struct acpi_device
*device
= data
;
524 /* Fixed hardware devices have no handles */
525 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
529 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
533 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
535 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
536 acpi_device_notify_fixed
,
538 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
540 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
541 acpi_device_notify_fixed
,
544 status
= acpi_install_notify_handler(device
->handle
,
549 if (ACPI_FAILURE(status
))
554 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
556 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
557 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
558 acpi_device_notify_fixed
);
559 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
560 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
561 acpi_device_notify_fixed
);
563 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
567 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
568 static int acpi_device_probe(struct device
* dev
)
570 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
571 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
574 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
576 if (acpi_drv
->ops
.notify
) {
577 ret
= acpi_device_install_notify_handler(acpi_dev
);
579 if (acpi_drv
->ops
.remove
)
580 acpi_drv
->ops
.remove(acpi_dev
,
581 acpi_dev
->removal_type
);
586 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
587 "Found driver [%s] for device [%s]\n",
588 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
594 static int acpi_device_remove(struct device
* dev
)
596 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
597 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
600 if (acpi_drv
->ops
.notify
)
601 acpi_device_remove_notify_handler(acpi_dev
);
602 if (acpi_drv
->ops
.remove
)
603 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
605 acpi_dev
->driver
= NULL
;
606 acpi_dev
->driver_data
= NULL
;
612 struct bus_type acpi_bus_type
= {
614 .match
= acpi_bus_match
,
615 .probe
= acpi_device_probe
,
616 .remove
= acpi_device_remove
,
617 .uevent
= acpi_device_uevent
,
620 static int acpi_device_register(struct acpi_device
*device
)
623 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
629 * Link this device to its parent and siblings.
631 INIT_LIST_HEAD(&device
->children
);
632 INIT_LIST_HEAD(&device
->node
);
633 INIT_LIST_HEAD(&device
->wakeup_list
);
634 INIT_LIST_HEAD(&device
->physical_node_list
);
635 mutex_init(&device
->physical_node_lock
);
637 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
639 printk(KERN_ERR PREFIX
"Memory allocation error\n");
643 mutex_lock(&acpi_device_lock
);
645 * Find suitable bus_id and instance number in acpi_bus_id_list
646 * If failed, create one and link it into acpi_bus_id_list
648 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
649 if (!strcmp(acpi_device_bus_id
->bus_id
,
650 acpi_device_hid(device
))) {
651 acpi_device_bus_id
->instance_no
++;
658 acpi_device_bus_id
= new_bus_id
;
659 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
660 acpi_device_bus_id
->instance_no
= 0;
661 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
663 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
666 list_add_tail(&device
->node
, &device
->parent
->children
);
668 if (device
->wakeup
.flags
.valid
)
669 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
670 mutex_unlock(&acpi_device_lock
);
673 device
->dev
.parent
= &device
->parent
->dev
;
674 device
->dev
.bus
= &acpi_bus_type
;
675 device
->dev
.release
= &acpi_device_release
;
676 result
= device_register(&device
->dev
);
678 dev_err(&device
->dev
, "Error registering device\n");
682 result
= acpi_device_setup_files(device
);
684 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
685 dev_name(&device
->dev
));
687 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
690 mutex_lock(&acpi_device_lock
);
692 list_del(&device
->node
);
693 list_del(&device
->wakeup_list
);
694 mutex_unlock(&acpi_device_lock
);
698 static void acpi_device_unregister(struct acpi_device
*device
)
700 mutex_lock(&acpi_device_lock
);
702 list_del(&device
->node
);
704 list_del(&device
->wakeup_list
);
705 mutex_unlock(&acpi_device_lock
);
707 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
709 acpi_device_remove_files(device
);
710 device_unregister(&device
->dev
);
713 /* --------------------------------------------------------------------------
715 -------------------------------------------------------------------------- */
717 * acpi_bus_driver_init - add a device to a driver
718 * @device: the device to add and initialize
719 * @driver: driver for the device
721 * Used to initialize a device via its device driver. Called whenever a
722 * driver is bound to a device. Invokes the driver's add() ops.
725 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
729 if (!device
|| !driver
)
732 if (!driver
->ops
.add
)
735 result
= driver
->ops
.add(device
);
737 device
->driver
= NULL
;
738 device
->driver_data
= NULL
;
742 device
->driver
= driver
;
745 * TBD - Configuration Management: Assign resources to device based
746 * upon possible configuration and currently allocated resources.
749 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
750 "Driver successfully bound to device\n"));
755 * acpi_bus_register_driver - register a driver with the ACPI bus
756 * @driver: driver being registered
758 * Registers a driver with the ACPI bus. Searches the namespace for all
759 * devices that match the driver's criteria and binds. Returns zero for
760 * success or a negative error status for failure.
762 int acpi_bus_register_driver(struct acpi_driver
*driver
)
768 driver
->drv
.name
= driver
->name
;
769 driver
->drv
.bus
= &acpi_bus_type
;
770 driver
->drv
.owner
= driver
->owner
;
772 ret
= driver_register(&driver
->drv
);
776 EXPORT_SYMBOL(acpi_bus_register_driver
);
779 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
780 * @driver: driver to unregister
782 * Unregisters a driver with the ACPI bus. Searches the namespace for all
783 * devices that match the driver's criteria and unbinds.
785 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
787 driver_unregister(&driver
->drv
);
790 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
792 /* --------------------------------------------------------------------------
794 -------------------------------------------------------------------------- */
795 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
799 struct acpi_device
*device
;
802 * Fixed hardware devices do not appear in the namespace and do not
803 * have handles, but we fabricate acpi_devices for them, so we have
804 * to deal with them specially.
810 status
= acpi_get_parent(handle
, &handle
);
811 if (status
== AE_NULL_ENTRY
)
813 if (ACPI_FAILURE(status
))
816 ret
= acpi_bus_get_device(handle
, &device
);
823 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
827 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
828 union acpi_object
*obj
;
830 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
831 if (ACPI_FAILURE(status
))
834 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
835 if (ACPI_SUCCESS(status
)) {
836 obj
= buffer
.pointer
;
837 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
839 kfree(buffer
.pointer
);
843 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
845 void acpi_bus_data_handler(acpi_handle handle
, void *context
)
853 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
855 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
860 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
861 struct acpi_device_wakeup
*wakeup
)
863 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
864 union acpi_object
*package
= NULL
;
865 union acpi_object
*element
= NULL
;
870 return AE_BAD_PARAMETER
;
873 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
874 if (ACPI_FAILURE(status
)) {
875 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
879 package
= (union acpi_object
*)buffer
.pointer
;
881 if (!package
|| (package
->package
.count
< 2)) {
882 status
= AE_BAD_DATA
;
886 element
= &(package
->package
.elements
[0]);
888 status
= AE_BAD_DATA
;
891 if (element
->type
== ACPI_TYPE_PACKAGE
) {
892 if ((element
->package
.count
< 2) ||
893 (element
->package
.elements
[0].type
!=
894 ACPI_TYPE_LOCAL_REFERENCE
)
895 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
)) {
896 status
= AE_BAD_DATA
;
900 element
->package
.elements
[0].reference
.handle
;
902 (u32
) element
->package
.elements
[1].integer
.value
;
903 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
904 wakeup
->gpe_device
= NULL
;
905 wakeup
->gpe_number
= element
->integer
.value
;
907 status
= AE_BAD_DATA
;
911 element
= &(package
->package
.elements
[1]);
912 if (element
->type
!= ACPI_TYPE_INTEGER
) {
913 status
= AE_BAD_DATA
;
916 wakeup
->sleep_state
= element
->integer
.value
;
918 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
919 status
= AE_NO_MEMORY
;
922 wakeup
->resources
.count
= package
->package
.count
- 2;
923 for (i
= 0; i
< wakeup
->resources
.count
; i
++) {
924 element
= &(package
->package
.elements
[i
+ 2]);
925 if (element
->type
!= ACPI_TYPE_LOCAL_REFERENCE
) {
926 status
= AE_BAD_DATA
;
930 wakeup
->resources
.handles
[i
] = element
->reference
.handle
;
933 acpi_setup_gpe_for_wake(handle
, wakeup
->gpe_device
, wakeup
->gpe_number
);
936 kfree(buffer
.pointer
);
941 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
943 struct acpi_device_id button_device_ids
[] = {
950 acpi_event_status event_status
;
952 device
->wakeup
.flags
.notifier_present
= 0;
954 /* Power button, Lid switch always enable wakeup */
955 if (!acpi_match_device_ids(device
, button_device_ids
)) {
956 device
->wakeup
.flags
.run_wake
= 1;
957 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
958 /* Do not use Lid/sleep button for S5 wakeup */
959 if (device
->wakeup
.sleep_state
== ACPI_STATE_S5
)
960 device
->wakeup
.sleep_state
= ACPI_STATE_S4
;
962 device_set_wakeup_capable(&device
->dev
, true);
966 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
967 device
->wakeup
.gpe_number
,
970 device
->wakeup
.flags
.run_wake
=
971 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
974 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
977 acpi_status status
= 0;
980 /* Presence of _PRW indicates wake capable */
981 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
982 if (ACPI_FAILURE(status
))
985 status
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
987 if (ACPI_FAILURE(status
)) {
988 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
992 device
->wakeup
.flags
.valid
= 1;
993 device
->wakeup
.prepare_count
= 0;
994 acpi_bus_set_run_wake_flags(device
);
995 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
996 * system for the ACPI device with the _PRW object.
997 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
998 * So it is necessary to call _DSW object first. Only when it is not
999 * present will the _PSW object used.
1001 psw_error
= acpi_device_sleep_wake(device
, 0, 0, 0);
1003 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1004 "error in _DSW or _PSW evaluation\n"));
1007 static void acpi_bus_add_power_resource(acpi_handle handle
);
1009 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
1011 acpi_status status
= 0;
1012 acpi_handle handle
= NULL
;
1017 * Power Management Flags
1019 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
1020 if (ACPI_SUCCESS(status
))
1021 device
->power
.flags
.explicit_get
= 1;
1022 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
1023 if (ACPI_SUCCESS(status
))
1024 device
->power
.flags
.inrush_current
= 1;
1027 * Enumerate supported power management states
1029 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
1030 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
1031 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
1033 /* Evaluate "_PRx" to se if power resources are referenced */
1034 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
1036 if (ps
->resources
.count
) {
1039 device
->power
.flags
.power_resources
= 1;
1040 for (j
= 0; j
< ps
->resources
.count
; j
++)
1041 acpi_bus_add_power_resource(ps
->resources
.handles
[j
]);
1044 /* Evaluate "_PSx" to see if we can do explicit sets */
1045 object_name
[2] = 'S';
1046 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
1047 if (ACPI_SUCCESS(status
))
1048 ps
->flags
.explicit_set
= 1;
1051 * State is valid if there are means to put the device into it.
1052 * D3hot is only valid if _PR3 present.
1054 if (ps
->resources
.count
||
1055 (ps
->flags
.explicit_set
&& i
< ACPI_STATE_D3_HOT
)) {
1056 ps
->flags
.valid
= 1;
1057 ps
->flags
.os_accessible
= 1;
1060 ps
->power
= -1; /* Unknown - driver assigned */
1061 ps
->latency
= -1; /* Unknown - driver assigned */
1064 /* Set defaults for D0 and D3 states (always valid) */
1065 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1066 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1067 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
1068 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
1070 /* Set D3cold's explicit_set flag if _PS3 exists. */
1071 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1072 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1074 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1075 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1076 device
->power
.flags
.power_resources
)
1077 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1079 acpi_bus_init_power(device
);
1084 static int acpi_bus_get_flags(struct acpi_device
*device
)
1086 acpi_status status
= AE_OK
;
1087 acpi_handle temp
= NULL
;
1090 /* Presence of _STA indicates 'dynamic_status' */
1091 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
1092 if (ACPI_SUCCESS(status
))
1093 device
->flags
.dynamic_status
= 1;
1095 /* Presence of _RMV indicates 'removable' */
1096 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
1097 if (ACPI_SUCCESS(status
))
1098 device
->flags
.removable
= 1;
1100 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1101 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
1102 if (ACPI_SUCCESS(status
))
1103 device
->flags
.ejectable
= 1;
1105 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
1106 if (ACPI_SUCCESS(status
))
1107 device
->flags
.ejectable
= 1;
1110 /* Power resources cannot be power manageable. */
1111 if (device
->device_type
== ACPI_BUS_TYPE_POWER
)
1114 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1115 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
1116 if (ACPI_FAILURE(status
))
1117 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
1118 if (ACPI_SUCCESS(status
))
1119 device
->flags
.power_manageable
= 1;
1121 /* TBD: Performance management */
1126 static void acpi_device_get_busid(struct acpi_device
*device
)
1128 char bus_id
[5] = { '?', 0 };
1129 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1135 * The device's Bus ID is simply the object name.
1136 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1138 if (ACPI_IS_ROOT_DEVICE(device
)) {
1139 strcpy(device
->pnp
.bus_id
, "ACPI");
1143 switch (device
->device_type
) {
1144 case ACPI_BUS_TYPE_POWER_BUTTON
:
1145 strcpy(device
->pnp
.bus_id
, "PWRF");
1147 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1148 strcpy(device
->pnp
.bus_id
, "SLPF");
1151 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1152 /* Clean up trailing underscores (if any) */
1153 for (i
= 3; i
> 1; i
--) {
1154 if (bus_id
[i
] == '_')
1159 strcpy(device
->pnp
.bus_id
, bus_id
);
1165 * acpi_bay_match - see if a device is an ejectable driver bay
1167 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1168 * then we can safely call it an ejectable drive bay
1170 static int acpi_bay_match(struct acpi_device
*device
){
1174 acpi_handle phandle
;
1176 handle
= device
->handle
;
1178 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
1179 if (ACPI_FAILURE(status
))
1182 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
1183 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
1184 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
1185 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
1188 if (acpi_get_parent(handle
, &phandle
))
1191 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
1192 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
1193 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
1194 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
1201 * acpi_dock_match - see if a device has a _DCK method
1203 static int acpi_dock_match(struct acpi_device
*device
)
1206 return acpi_get_handle(device
->handle
, "_DCK", &tmp
);
1209 const char *acpi_device_hid(struct acpi_device
*device
)
1211 struct acpi_hardware_id
*hid
;
1213 if (list_empty(&device
->pnp
.ids
))
1216 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1219 EXPORT_SYMBOL(acpi_device_hid
);
1221 static void acpi_add_id(struct acpi_device
*device
, const char *dev_id
)
1223 struct acpi_hardware_id
*id
;
1225 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1229 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1235 list_add_tail(&id
->list
, &device
->pnp
.ids
);
1239 * Old IBM workstations have a DSDT bug wherein the SMBus object
1240 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1241 * prefix. Work around this.
1243 static int acpi_ibm_smbus_match(struct acpi_device
*device
)
1245 acpi_handle h_dummy
;
1246 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1249 if (!dmi_name_in_vendors("IBM"))
1252 /* Look for SMBS object */
1253 result
= acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &path
);
1257 if (strcmp("SMBS", path
.pointer
)) {
1262 /* Does it have the necessary (but misnamed) methods? */
1264 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBI", &h_dummy
)) &&
1265 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBR", &h_dummy
)) &&
1266 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBW", &h_dummy
)))
1269 kfree(path
.pointer
);
1273 static void acpi_device_set_id(struct acpi_device
*device
)
1276 struct acpi_device_info
*info
;
1277 struct acpi_pnp_device_id_list
*cid_list
;
1280 switch (device
->device_type
) {
1281 case ACPI_BUS_TYPE_DEVICE
:
1282 if (ACPI_IS_ROOT_DEVICE(device
)) {
1283 acpi_add_id(device
, ACPI_SYSTEM_HID
);
1287 status
= acpi_get_object_info(device
->handle
, &info
);
1288 if (ACPI_FAILURE(status
)) {
1289 printk(KERN_ERR PREFIX
"%s: Error reading device info\n", __func__
);
1293 if (info
->valid
& ACPI_VALID_HID
)
1294 acpi_add_id(device
, info
->hardware_id
.string
);
1295 if (info
->valid
& ACPI_VALID_CID
) {
1296 cid_list
= &info
->compatible_id_list
;
1297 for (i
= 0; i
< cid_list
->count
; i
++)
1298 acpi_add_id(device
, cid_list
->ids
[i
].string
);
1300 if (info
->valid
& ACPI_VALID_ADR
) {
1301 device
->pnp
.bus_address
= info
->address
;
1302 device
->flags
.bus_address
= 1;
1304 if (info
->valid
& ACPI_VALID_UID
)
1305 device
->pnp
.unique_id
= kstrdup(info
->unique_id
.string
,
1311 * Some devices don't reliably have _HIDs & _CIDs, so add
1312 * synthetic HIDs to make sure drivers can find them.
1314 if (acpi_is_video_device(device
))
1315 acpi_add_id(device
, ACPI_VIDEO_HID
);
1316 else if (ACPI_SUCCESS(acpi_bay_match(device
)))
1317 acpi_add_id(device
, ACPI_BAY_HID
);
1318 else if (ACPI_SUCCESS(acpi_dock_match(device
)))
1319 acpi_add_id(device
, ACPI_DOCK_HID
);
1320 else if (!acpi_ibm_smbus_match(device
))
1321 acpi_add_id(device
, ACPI_SMBUS_IBM_HID
);
1322 else if (list_empty(&device
->pnp
.ids
) &&
1323 ACPI_IS_ROOT_DEVICE(device
->parent
)) {
1324 acpi_add_id(device
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1325 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1326 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1330 case ACPI_BUS_TYPE_POWER
:
1331 acpi_add_id(device
, ACPI_POWER_HID
);
1333 case ACPI_BUS_TYPE_PROCESSOR
:
1334 acpi_add_id(device
, ACPI_PROCESSOR_OBJECT_HID
);
1336 case ACPI_BUS_TYPE_THERMAL
:
1337 acpi_add_id(device
, ACPI_THERMAL_HID
);
1339 case ACPI_BUS_TYPE_POWER_BUTTON
:
1340 acpi_add_id(device
, ACPI_BUTTON_HID_POWERF
);
1342 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1343 acpi_add_id(device
, ACPI_BUTTON_HID_SLEEPF
);
1348 static int acpi_device_set_context(struct acpi_device
*device
)
1355 * Attach this 'struct acpi_device' to the ACPI object. This makes
1356 * resolutions from handle->device very efficient. Fixed hardware
1357 * devices have no handles, so we skip them.
1359 if (!device
->handle
)
1362 status
= acpi_attach_data(device
->handle
,
1363 acpi_bus_data_handler
, device
);
1364 if (ACPI_SUCCESS(status
))
1367 printk(KERN_ERR PREFIX
"Error attaching device data\n");
1371 static int acpi_add_single_object(struct acpi_device
**child
,
1372 acpi_handle handle
, int type
,
1373 unsigned long long sta
, bool match_driver
)
1376 struct acpi_device
*device
;
1377 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1379 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1381 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1385 INIT_LIST_HEAD(&device
->pnp
.ids
);
1386 device
->device_type
= type
;
1387 device
->handle
= handle
;
1388 device
->parent
= acpi_bus_get_parent(handle
);
1389 STRUCT_TO_INT(device
->status
) = sta
;
1391 acpi_device_get_busid(device
);
1396 * Note that we only look for object handles -- cannot evaluate objects
1397 * until we know the device is present and properly initialized.
1399 result
= acpi_bus_get_flags(device
);
1406 * TBD: Synch with Core's enumeration/initialization process.
1408 acpi_device_set_id(device
);
1414 if (device
->flags
.power_manageable
) {
1415 result
= acpi_bus_get_power_flags(device
);
1421 * Wakeup device management
1422 *-----------------------
1424 acpi_bus_get_wakeup_device_flags(device
);
1427 * Performance Management
1428 * ----------------------
1430 if (device
->flags
.performance_manageable
) {
1431 result
= acpi_bus_get_perf_flags(device
);
1436 if ((result
= acpi_device_set_context(device
)))
1439 device
->flags
.match_driver
= match_driver
;
1440 result
= acpi_device_register(device
);
1444 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1445 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1446 "Adding %s [%s] parent %s\n", dev_name(&device
->dev
),
1447 (char *) buffer
.pointer
,
1448 device
->parent
? dev_name(&device
->parent
->dev
) :
1450 kfree(buffer
.pointer
);
1453 acpi_device_release(&device
->dev
);
1458 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1459 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1461 static void acpi_bus_add_power_resource(acpi_handle handle
)
1463 struct acpi_device
*device
= NULL
;
1465 acpi_bus_get_device(handle
, &device
);
1467 acpi_add_single_object(&device
, handle
, ACPI_BUS_TYPE_POWER
,
1468 ACPI_STA_DEFAULT
, true);
1471 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1472 unsigned long long *sta
)
1475 acpi_object_type acpi_type
;
1477 status
= acpi_get_type(handle
, &acpi_type
);
1478 if (ACPI_FAILURE(status
))
1481 switch (acpi_type
) {
1482 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1483 case ACPI_TYPE_DEVICE
:
1484 *type
= ACPI_BUS_TYPE_DEVICE
;
1485 status
= acpi_bus_get_status_handle(handle
, sta
);
1486 if (ACPI_FAILURE(status
))
1489 case ACPI_TYPE_PROCESSOR
:
1490 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1491 status
= acpi_bus_get_status_handle(handle
, sta
);
1492 if (ACPI_FAILURE(status
))
1495 case ACPI_TYPE_THERMAL
:
1496 *type
= ACPI_BUS_TYPE_THERMAL
;
1497 *sta
= ACPI_STA_DEFAULT
;
1499 case ACPI_TYPE_POWER
:
1500 *type
= ACPI_BUS_TYPE_POWER
;
1501 *sta
= ACPI_STA_DEFAULT
;
1510 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
1511 void *not_used
, void **return_value
)
1513 struct acpi_device
*device
= NULL
;
1515 unsigned long long sta
;
1519 acpi_bus_get_device(handle
, &device
);
1523 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1527 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1528 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
)) {
1529 struct acpi_device_wakeup wakeup
;
1532 status
= acpi_get_handle(handle
, "_PRW", &temp
);
1533 if (ACPI_SUCCESS(status
))
1534 acpi_bus_extract_wakeup_device_power_package(handle
,
1536 return AE_CTRL_DEPTH
;
1539 acpi_add_single_object(&device
, handle
, type
, sta
,
1540 type
== ACPI_BUS_TYPE_POWER
);
1542 return AE_CTRL_DEPTH
;
1544 device
->flags
.match_driver
= true;
1548 *return_value
= device
;
1553 static acpi_status
acpi_bus_device_attach(acpi_handle handle
, u32 lvl_not_used
,
1554 void *not_used
, void **ret_not_used
)
1556 acpi_status status
= AE_OK
;
1557 struct acpi_device
*device
;
1558 unsigned long long sta_not_used
;
1562 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1563 * namespace walks prematurely.
1565 if (acpi_bus_type_and_status(handle
, &type_not_used
, &sta_not_used
))
1568 if (acpi_bus_get_device(handle
, &device
))
1569 return AE_CTRL_DEPTH
;
1571 if (!acpi_match_device_ids(device
, acpi_platform_device_ids
)) {
1572 /* This is a known good platform device. */
1573 acpi_create_platform_device(device
);
1574 } else if (device_attach(&device
->dev
) < 0) {
1575 status
= AE_CTRL_DEPTH
;
1581 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1582 * @handle: Root of the namespace scope to scan.
1584 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1587 * If no devices were found, -ENODEV is returned, but it does not mean that
1588 * there has been a real error. There just have been no suitable ACPI objects
1589 * in the table trunk from which the kernel could create a device and add an
1590 * appropriate driver.
1592 int acpi_bus_scan(acpi_handle handle
)
1594 void *device
= NULL
;
1596 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
1597 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1598 acpi_bus_check_add
, NULL
, NULL
, &device
);
1603 if (ACPI_SUCCESS(acpi_bus_device_attach(handle
, 0, NULL
, NULL
)))
1604 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1605 acpi_bus_device_attach
, NULL
, NULL
, NULL
);
1609 EXPORT_SYMBOL(acpi_bus_scan
);
1611 static acpi_status
acpi_bus_device_detach(acpi_handle handle
, u32 lvl_not_used
,
1612 void *not_used
, void **ret_not_used
)
1614 struct acpi_device
*device
= NULL
;
1616 if (!acpi_bus_get_device(handle
, &device
)) {
1617 device
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1618 device_release_driver(&device
->dev
);
1623 static acpi_status
acpi_bus_remove(acpi_handle handle
, u32 lvl_not_used
,
1624 void *not_used
, void **ret_not_used
)
1626 struct acpi_device
*device
= NULL
;
1628 if (!acpi_bus_get_device(handle
, &device
))
1629 acpi_device_unregister(device
);
1634 int acpi_bus_trim(struct acpi_device
*start
)
1637 * Execute acpi_bus_device_detach() as a post-order callback to detach
1638 * all ACPI drivers from the device nodes being removed.
1640 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
1641 acpi_bus_device_detach
, NULL
, NULL
);
1642 acpi_bus_device_detach(start
->handle
, 0, NULL
, NULL
);
1644 * Execute acpi_bus_remove() as a post-order callback to remove device
1645 * nodes in the given namespace scope.
1647 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
1648 acpi_bus_remove
, NULL
, NULL
);
1649 acpi_bus_remove(start
->handle
, 0, NULL
, NULL
);
1652 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1654 static int acpi_bus_scan_fixed(void)
1657 struct acpi_device
*device
= NULL
;
1660 * Enumerate all fixed-feature devices.
1662 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1663 result
= acpi_add_single_object(&device
, NULL
,
1664 ACPI_BUS_TYPE_POWER_BUTTON
,
1665 ACPI_STA_DEFAULT
, true);
1666 device_init_wakeup(&device
->dev
, true);
1669 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1670 result
= acpi_add_single_object(&device
, NULL
,
1671 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1672 ACPI_STA_DEFAULT
, true);
1678 int __init
acpi_scan_init(void)
1682 result
= bus_register(&acpi_bus_type
);
1684 /* We don't want to quit even if we failed to add suspend/resume */
1685 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1689 acpi_pci_root_init();
1692 * Enumerate devices in the ACPI namespace.
1694 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
1698 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
1702 result
= acpi_bus_scan_fixed();
1704 acpi_device_unregister(acpi_root
);
1708 acpi_update_all_gpes();