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";
32 static LIST_HEAD(acpi_device_list
);
33 static LIST_HEAD(acpi_bus_id_list
);
34 DEFINE_MUTEX(acpi_device_lock
);
35 LIST_HEAD(acpi_wakeup_device_list
);
37 struct acpi_device_bus_id
{
39 unsigned int instance_no
;
40 struct list_head node
;
44 * Creates hid/cid(s) string needed for modalias and uevent
45 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
46 * char *modalias: "acpi:IBM0001:ACPI0001"
48 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
53 struct acpi_hardware_id
*id
;
55 if (list_empty(&acpi_dev
->pnp
.ids
))
58 len
= snprintf(modalias
, size
, "acpi:");
61 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
62 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
63 if (count
< 0 || count
>= size
)
74 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
75 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
78 /* Device has no HID and no CID or string is >1024 */
79 len
= create_modalias(acpi_dev
, buf
, 1024);
85 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
88 * acpi_bus_hot_remove_device: hot-remove a device and its children
89 * @context: struct acpi_eject_event pointer (freed in this func)
91 * Hot-remove a device and its children. This function frees up the
92 * memory space passed by arg context, so that the caller may call
93 * this function asynchronously through acpi_os_hotplug_execute().
95 void acpi_bus_hot_remove_device(void *context
)
97 struct acpi_eject_event
*ej_event
= (struct acpi_eject_event
*) context
;
98 struct acpi_device
*device
;
99 acpi_handle handle
= ej_event
->handle
;
100 struct acpi_object_list arg_list
;
101 union acpi_object arg
;
102 acpi_status status
= AE_OK
;
103 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
; /* default */
105 if (acpi_bus_get_device(handle
, &device
))
111 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
112 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
114 if (acpi_bus_trim(device
, 1)) {
115 printk(KERN_ERR PREFIX
116 "Removing device failed\n");
120 /* power off device */
121 status
= acpi_evaluate_object(handle
, "_PS3", NULL
, NULL
);
122 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
)
123 printk(KERN_WARNING PREFIX
124 "Power-off device failed\n");
126 if (device
->flags
.lockable
) {
128 arg_list
.pointer
= &arg
;
129 arg
.type
= ACPI_TYPE_INTEGER
;
130 arg
.integer
.value
= 0;
131 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
135 arg_list
.pointer
= &arg
;
136 arg
.type
= ACPI_TYPE_INTEGER
;
137 arg
.integer
.value
= 1;
142 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
143 if (ACPI_FAILURE(status
)) {
144 if (status
!= AE_NOT_FOUND
)
145 printk(KERN_WARNING PREFIX
146 "Eject device failed\n");
154 /* Inform firmware the hot-remove operation has completed w/ error */
155 (void) acpi_evaluate_hotplug_ost(handle
,
156 ej_event
->event
, ost_code
, NULL
);
162 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
163 const char *buf
, size_t count
)
167 acpi_object_type type
= 0;
168 struct acpi_device
*acpi_device
= to_acpi_device(d
);
169 struct acpi_eject_event
*ej_event
;
171 if ((!count
) || (buf
[0] != '1')) {
175 if (acpi_device
->driver
== NULL
) {
180 status
= acpi_get_type(acpi_device
->handle
, &type
);
181 if (ACPI_FAILURE(status
) || (!acpi_device
->flags
.ejectable
)) {
186 ej_event
= kmalloc(sizeof(*ej_event
), GFP_KERNEL
);
192 ej_event
->handle
= acpi_device
->handle
;
193 if (acpi_device
->flags
.eject_pending
) {
194 /* event originated from ACPI eject notification */
195 ej_event
->event
= ACPI_NOTIFY_EJECT_REQUEST
;
196 acpi_device
->flags
.eject_pending
= 0;
198 /* event originated from user */
199 ej_event
->event
= ACPI_OST_EC_OSPM_EJECT
;
200 (void) acpi_evaluate_hotplug_ost(ej_event
->handle
,
201 ej_event
->event
, ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
204 acpi_os_hotplug_execute(acpi_bus_hot_remove_device
, (void *)ej_event
);
209 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
212 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
213 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
215 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
217 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
220 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
221 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
222 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
225 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
229 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
234 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
236 /* sysfs file that shows description text from the ACPI _STR method */
237 static ssize_t
description_show(struct device
*dev
,
238 struct device_attribute
*attr
,
240 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
243 if (acpi_dev
->pnp
.str_obj
== NULL
)
247 * The _STR object contains a Unicode identifier for a device.
248 * We need to convert to utf-8 so it can be displayed.
250 result
= utf16s_to_utf8s(
251 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
252 acpi_dev
->pnp
.str_obj
->buffer
.length
,
253 UTF16_LITTLE_ENDIAN
, buf
,
256 buf
[result
++] = '\n';
260 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
262 static int acpi_device_setup_files(struct acpi_device
*dev
)
264 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
270 * Devices gotten from FADT don't have a "path" attribute
273 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
278 if (!list_empty(&dev
->pnp
.ids
)) {
279 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
283 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
289 * If device has _STR, 'description' file is created
291 status
= acpi_get_handle(dev
->handle
, "_STR", &temp
);
292 if (ACPI_SUCCESS(status
)) {
293 status
= acpi_evaluate_object(dev
->handle
, "_STR",
295 if (ACPI_FAILURE(status
))
296 buffer
.pointer
= NULL
;
297 dev
->pnp
.str_obj
= buffer
.pointer
;
298 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
304 * If device has _EJ0, 'eject' file is created that is used to trigger
305 * hot-removal function from userland.
307 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
308 if (ACPI_SUCCESS(status
))
309 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
314 static void acpi_device_remove_files(struct acpi_device
*dev
)
320 * If device has _STR, remove 'description' file
322 status
= acpi_get_handle(dev
->handle
, "_STR", &temp
);
323 if (ACPI_SUCCESS(status
)) {
324 kfree(dev
->pnp
.str_obj
);
325 device_remove_file(&dev
->dev
, &dev_attr_description
);
328 * If device has _EJ0, remove 'eject' file.
330 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
331 if (ACPI_SUCCESS(status
))
332 device_remove_file(&dev
->dev
, &dev_attr_eject
);
334 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
335 device_remove_file(&dev
->dev
, &dev_attr_hid
);
337 device_remove_file(&dev
->dev
, &dev_attr_path
);
339 /* --------------------------------------------------------------------------
341 -------------------------------------------------------------------------- */
343 int acpi_match_device_ids(struct acpi_device
*device
,
344 const struct acpi_device_id
*ids
)
346 const struct acpi_device_id
*id
;
347 struct acpi_hardware_id
*hwid
;
350 * If the device is not present, it is unnecessary to load device
353 if (!device
->status
.present
)
356 for (id
= ids
; id
->id
[0]; id
++)
357 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
358 if (!strcmp((char *) id
->id
, hwid
->id
))
363 EXPORT_SYMBOL(acpi_match_device_ids
);
365 static void acpi_free_ids(struct acpi_device
*device
)
367 struct acpi_hardware_id
*id
, *tmp
;
369 list_for_each_entry_safe(id
, tmp
, &device
->pnp
.ids
, list
) {
375 static void acpi_device_release(struct device
*dev
)
377 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
379 acpi_free_ids(acpi_dev
);
383 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
385 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
386 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
388 return !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
391 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
393 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
396 if (list_empty(&acpi_dev
->pnp
.ids
))
399 if (add_uevent_var(env
, "MODALIAS="))
401 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
402 sizeof(env
->buf
) - env
->buflen
);
403 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
409 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
411 struct acpi_device
*device
= data
;
413 device
->driver
->ops
.notify(device
, event
);
416 static acpi_status
acpi_device_notify_fixed(void *data
)
418 struct acpi_device
*device
= data
;
420 /* Fixed hardware devices have no handles */
421 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
425 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
429 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
431 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
432 acpi_device_notify_fixed
,
434 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
436 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
437 acpi_device_notify_fixed
,
440 status
= acpi_install_notify_handler(device
->handle
,
445 if (ACPI_FAILURE(status
))
450 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
452 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
453 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
454 acpi_device_notify_fixed
);
455 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
456 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
457 acpi_device_notify_fixed
);
459 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
463 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
464 static int acpi_start_single_object(struct acpi_device
*);
465 static int acpi_device_probe(struct device
* dev
)
467 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
468 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
471 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
473 if (acpi_dev
->bus_ops
.acpi_op_start
)
474 acpi_start_single_object(acpi_dev
);
476 if (acpi_drv
->ops
.notify
) {
477 ret
= acpi_device_install_notify_handler(acpi_dev
);
479 if (acpi_drv
->ops
.remove
)
480 acpi_drv
->ops
.remove(acpi_dev
,
481 acpi_dev
->removal_type
);
486 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
487 "Found driver [%s] for device [%s]\n",
488 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
494 static int acpi_device_remove(struct device
* dev
)
496 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
497 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
500 if (acpi_drv
->ops
.notify
)
501 acpi_device_remove_notify_handler(acpi_dev
);
502 if (acpi_drv
->ops
.remove
)
503 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
505 acpi_dev
->driver
= NULL
;
506 acpi_dev
->driver_data
= NULL
;
512 struct bus_type acpi_bus_type
= {
514 .match
= acpi_bus_match
,
515 .probe
= acpi_device_probe
,
516 .remove
= acpi_device_remove
,
517 .uevent
= acpi_device_uevent
,
520 static int acpi_device_register(struct acpi_device
*device
)
523 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
529 * Link this device to its parent and siblings.
531 INIT_LIST_HEAD(&device
->children
);
532 INIT_LIST_HEAD(&device
->node
);
533 INIT_LIST_HEAD(&device
->wakeup_list
);
534 INIT_LIST_HEAD(&device
->physical_node_list
);
535 mutex_init(&device
->physical_node_lock
);
537 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
539 printk(KERN_ERR PREFIX
"Memory allocation error\n");
543 mutex_lock(&acpi_device_lock
);
545 * Find suitable bus_id and instance number in acpi_bus_id_list
546 * If failed, create one and link it into acpi_bus_id_list
548 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
549 if (!strcmp(acpi_device_bus_id
->bus_id
,
550 acpi_device_hid(device
))) {
551 acpi_device_bus_id
->instance_no
++;
558 acpi_device_bus_id
= new_bus_id
;
559 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
560 acpi_device_bus_id
->instance_no
= 0;
561 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
563 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
566 list_add_tail(&device
->node
, &device
->parent
->children
);
568 if (device
->wakeup
.flags
.valid
)
569 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
570 mutex_unlock(&acpi_device_lock
);
573 device
->dev
.parent
= &device
->parent
->dev
;
574 device
->dev
.bus
= &acpi_bus_type
;
575 device
->dev
.release
= &acpi_device_release
;
576 result
= device_register(&device
->dev
);
578 dev_err(&device
->dev
, "Error registering device\n");
582 result
= acpi_device_setup_files(device
);
584 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
585 dev_name(&device
->dev
));
587 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
590 mutex_lock(&acpi_device_lock
);
592 list_del(&device
->node
);
593 list_del(&device
->wakeup_list
);
594 mutex_unlock(&acpi_device_lock
);
598 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
600 mutex_lock(&acpi_device_lock
);
602 list_del(&device
->node
);
604 list_del(&device
->wakeup_list
);
605 mutex_unlock(&acpi_device_lock
);
607 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
609 acpi_device_remove_files(device
);
610 device_unregister(&device
->dev
);
613 /* --------------------------------------------------------------------------
615 -------------------------------------------------------------------------- */
617 * acpi_bus_driver_init - add a device to a driver
618 * @device: the device to add and initialize
619 * @driver: driver for the device
621 * Used to initialize a device via its device driver. Called whenever a
622 * driver is bound to a device. Invokes the driver's add() ops.
625 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
629 if (!device
|| !driver
)
632 if (!driver
->ops
.add
)
635 result
= driver
->ops
.add(device
);
637 device
->driver
= NULL
;
638 device
->driver_data
= NULL
;
642 device
->driver
= driver
;
645 * TBD - Configuration Management: Assign resources to device based
646 * upon possible configuration and currently allocated resources.
649 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
650 "Driver successfully bound to device\n"));
654 static int acpi_start_single_object(struct acpi_device
*device
)
657 struct acpi_driver
*driver
;
660 if (!(driver
= device
->driver
))
663 if (driver
->ops
.start
) {
664 result
= driver
->ops
.start(device
);
665 if (result
&& driver
->ops
.remove
)
666 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
673 * acpi_bus_register_driver - register a driver with the ACPI bus
674 * @driver: driver being registered
676 * Registers a driver with the ACPI bus. Searches the namespace for all
677 * devices that match the driver's criteria and binds. Returns zero for
678 * success or a negative error status for failure.
680 int acpi_bus_register_driver(struct acpi_driver
*driver
)
686 driver
->drv
.name
= driver
->name
;
687 driver
->drv
.bus
= &acpi_bus_type
;
688 driver
->drv
.owner
= driver
->owner
;
690 ret
= driver_register(&driver
->drv
);
694 EXPORT_SYMBOL(acpi_bus_register_driver
);
697 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
698 * @driver: driver to unregister
700 * Unregisters a driver with the ACPI bus. Searches the namespace for all
701 * devices that match the driver's criteria and unbinds.
703 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
705 driver_unregister(&driver
->drv
);
708 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
710 /* --------------------------------------------------------------------------
712 -------------------------------------------------------------------------- */
713 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
717 struct acpi_device
*device
;
720 * Fixed hardware devices do not appear in the namespace and do not
721 * have handles, but we fabricate acpi_devices for them, so we have
722 * to deal with them specially.
728 status
= acpi_get_parent(handle
, &handle
);
729 if (status
== AE_NULL_ENTRY
)
731 if (ACPI_FAILURE(status
))
734 ret
= acpi_bus_get_device(handle
, &device
);
741 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
745 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
746 union acpi_object
*obj
;
748 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
749 if (ACPI_FAILURE(status
))
752 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
753 if (ACPI_SUCCESS(status
)) {
754 obj
= buffer
.pointer
;
755 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
757 kfree(buffer
.pointer
);
761 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
763 void acpi_bus_data_handler(acpi_handle handle
, void *context
)
771 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
773 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
778 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
779 struct acpi_device_wakeup
*wakeup
)
781 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
782 union acpi_object
*package
= NULL
;
783 union acpi_object
*element
= NULL
;
788 return AE_BAD_PARAMETER
;
791 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
792 if (ACPI_FAILURE(status
)) {
793 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
797 package
= (union acpi_object
*)buffer
.pointer
;
799 if (!package
|| (package
->package
.count
< 2)) {
800 status
= AE_BAD_DATA
;
804 element
= &(package
->package
.elements
[0]);
806 status
= AE_BAD_DATA
;
809 if (element
->type
== ACPI_TYPE_PACKAGE
) {
810 if ((element
->package
.count
< 2) ||
811 (element
->package
.elements
[0].type
!=
812 ACPI_TYPE_LOCAL_REFERENCE
)
813 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
)) {
814 status
= AE_BAD_DATA
;
818 element
->package
.elements
[0].reference
.handle
;
820 (u32
) element
->package
.elements
[1].integer
.value
;
821 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
822 wakeup
->gpe_device
= NULL
;
823 wakeup
->gpe_number
= element
->integer
.value
;
825 status
= AE_BAD_DATA
;
829 element
= &(package
->package
.elements
[1]);
830 if (element
->type
!= ACPI_TYPE_INTEGER
) {
831 status
= AE_BAD_DATA
;
834 wakeup
->sleep_state
= element
->integer
.value
;
836 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
837 status
= AE_NO_MEMORY
;
840 wakeup
->resources
.count
= package
->package
.count
- 2;
841 for (i
= 0; i
< wakeup
->resources
.count
; i
++) {
842 element
= &(package
->package
.elements
[i
+ 2]);
843 if (element
->type
!= ACPI_TYPE_LOCAL_REFERENCE
) {
844 status
= AE_BAD_DATA
;
848 wakeup
->resources
.handles
[i
] = element
->reference
.handle
;
851 acpi_setup_gpe_for_wake(handle
, wakeup
->gpe_device
, wakeup
->gpe_number
);
854 kfree(buffer
.pointer
);
859 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
861 struct acpi_device_id button_device_ids
[] = {
868 acpi_event_status event_status
;
870 device
->wakeup
.flags
.notifier_present
= 0;
872 /* Power button, Lid switch always enable wakeup */
873 if (!acpi_match_device_ids(device
, button_device_ids
)) {
874 device
->wakeup
.flags
.run_wake
= 1;
875 device_set_wakeup_capable(&device
->dev
, true);
879 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
880 device
->wakeup
.gpe_number
,
883 device
->wakeup
.flags
.run_wake
=
884 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
887 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
890 acpi_status status
= 0;
893 /* Presence of _PRW indicates wake capable */
894 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
895 if (ACPI_FAILURE(status
))
898 status
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
900 if (ACPI_FAILURE(status
)) {
901 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
905 device
->wakeup
.flags
.valid
= 1;
906 device
->wakeup
.prepare_count
= 0;
907 acpi_bus_set_run_wake_flags(device
);
908 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
909 * system for the ACPI device with the _PRW object.
910 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
911 * So it is necessary to call _DSW object first. Only when it is not
912 * present will the _PSW object used.
914 psw_error
= acpi_device_sleep_wake(device
, 0, 0, 0);
916 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
917 "error in _DSW or _PSW evaluation\n"));
920 static void acpi_bus_add_power_resource(acpi_handle handle
);
922 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
924 acpi_status status
= 0;
925 acpi_handle handle
= NULL
;
930 * Power Management Flags
932 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
933 if (ACPI_SUCCESS(status
))
934 device
->power
.flags
.explicit_get
= 1;
935 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
936 if (ACPI_SUCCESS(status
))
937 device
->power
.flags
.inrush_current
= 1;
940 * Enumerate supported power management states
942 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
943 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
944 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
946 /* Evaluate "_PRx" to se if power resources are referenced */
947 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
949 if (ps
->resources
.count
) {
952 device
->power
.flags
.power_resources
= 1;
953 for (j
= 0; j
< ps
->resources
.count
; j
++)
954 acpi_bus_add_power_resource(ps
->resources
.handles
[j
]);
957 /* Evaluate "_PSx" to see if we can do explicit sets */
958 object_name
[2] = 'S';
959 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
960 if (ACPI_SUCCESS(status
))
961 ps
->flags
.explicit_set
= 1;
964 * State is valid if there are means to put the device into it.
965 * D3hot is only valid if _PR3 present.
967 if (ps
->resources
.count
||
968 (ps
->flags
.explicit_set
&& i
< ACPI_STATE_D3_HOT
))
971 ps
->power
= -1; /* Unknown - driver assigned */
972 ps
->latency
= -1; /* Unknown - driver assigned */
975 /* Set defaults for D0 and D3 states (always valid) */
976 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
977 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
978 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
979 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
981 /* Set D3cold's explicit_set flag if _PS3 exists. */
982 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
983 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
985 acpi_bus_init_power(device
);
990 static int acpi_bus_get_flags(struct acpi_device
*device
)
992 acpi_status status
= AE_OK
;
993 acpi_handle temp
= NULL
;
996 /* Presence of _STA indicates 'dynamic_status' */
997 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
998 if (ACPI_SUCCESS(status
))
999 device
->flags
.dynamic_status
= 1;
1001 /* Presence of _RMV indicates 'removable' */
1002 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
1003 if (ACPI_SUCCESS(status
))
1004 device
->flags
.removable
= 1;
1006 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1007 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
1008 if (ACPI_SUCCESS(status
))
1009 device
->flags
.ejectable
= 1;
1011 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
1012 if (ACPI_SUCCESS(status
))
1013 device
->flags
.ejectable
= 1;
1016 /* Presence of _LCK indicates 'lockable' */
1017 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
1018 if (ACPI_SUCCESS(status
))
1019 device
->flags
.lockable
= 1;
1021 /* Power resources cannot be power manageable. */
1022 if (device
->device_type
== ACPI_BUS_TYPE_POWER
)
1025 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1026 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
1027 if (ACPI_FAILURE(status
))
1028 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
1029 if (ACPI_SUCCESS(status
))
1030 device
->flags
.power_manageable
= 1;
1032 /* TBD: Performance management */
1037 static void acpi_device_get_busid(struct acpi_device
*device
)
1039 char bus_id
[5] = { '?', 0 };
1040 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1046 * The device's Bus ID is simply the object name.
1047 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1049 if (ACPI_IS_ROOT_DEVICE(device
)) {
1050 strcpy(device
->pnp
.bus_id
, "ACPI");
1054 switch (device
->device_type
) {
1055 case ACPI_BUS_TYPE_POWER_BUTTON
:
1056 strcpy(device
->pnp
.bus_id
, "PWRF");
1058 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1059 strcpy(device
->pnp
.bus_id
, "SLPF");
1062 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1063 /* Clean up trailing underscores (if any) */
1064 for (i
= 3; i
> 1; i
--) {
1065 if (bus_id
[i
] == '_')
1070 strcpy(device
->pnp
.bus_id
, bus_id
);
1076 * acpi_bay_match - see if a device is an ejectable driver bay
1078 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1079 * then we can safely call it an ejectable drive bay
1081 static int acpi_bay_match(struct acpi_device
*device
){
1085 acpi_handle phandle
;
1087 handle
= device
->handle
;
1089 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
1090 if (ACPI_FAILURE(status
))
1093 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
1094 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
1095 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
1096 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
1099 if (acpi_get_parent(handle
, &phandle
))
1102 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
1103 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
1104 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
1105 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
1112 * acpi_dock_match - see if a device has a _DCK method
1114 static int acpi_dock_match(struct acpi_device
*device
)
1117 return acpi_get_handle(device
->handle
, "_DCK", &tmp
);
1120 const char *acpi_device_hid(struct acpi_device
*device
)
1122 struct acpi_hardware_id
*hid
;
1124 if (list_empty(&device
->pnp
.ids
))
1127 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1130 EXPORT_SYMBOL(acpi_device_hid
);
1132 static void acpi_add_id(struct acpi_device
*device
, const char *dev_id
)
1134 struct acpi_hardware_id
*id
;
1136 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1140 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1146 list_add_tail(&id
->list
, &device
->pnp
.ids
);
1150 * Old IBM workstations have a DSDT bug wherein the SMBus object
1151 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1152 * prefix. Work around this.
1154 static int acpi_ibm_smbus_match(struct acpi_device
*device
)
1156 acpi_handle h_dummy
;
1157 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1160 if (!dmi_name_in_vendors("IBM"))
1163 /* Look for SMBS object */
1164 result
= acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &path
);
1168 if (strcmp("SMBS", path
.pointer
)) {
1173 /* Does it have the necessary (but misnamed) methods? */
1175 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBI", &h_dummy
)) &&
1176 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBR", &h_dummy
)) &&
1177 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBW", &h_dummy
)))
1180 kfree(path
.pointer
);
1184 static void acpi_device_set_id(struct acpi_device
*device
)
1187 struct acpi_device_info
*info
;
1188 struct acpica_device_id_list
*cid_list
;
1191 switch (device
->device_type
) {
1192 case ACPI_BUS_TYPE_DEVICE
:
1193 if (ACPI_IS_ROOT_DEVICE(device
)) {
1194 acpi_add_id(device
, ACPI_SYSTEM_HID
);
1198 status
= acpi_get_object_info(device
->handle
, &info
);
1199 if (ACPI_FAILURE(status
)) {
1200 printk(KERN_ERR PREFIX
"%s: Error reading device info\n", __func__
);
1204 if (info
->valid
& ACPI_VALID_HID
)
1205 acpi_add_id(device
, info
->hardware_id
.string
);
1206 if (info
->valid
& ACPI_VALID_CID
) {
1207 cid_list
= &info
->compatible_id_list
;
1208 for (i
= 0; i
< cid_list
->count
; i
++)
1209 acpi_add_id(device
, cid_list
->ids
[i
].string
);
1211 if (info
->valid
& ACPI_VALID_ADR
) {
1212 device
->pnp
.bus_address
= info
->address
;
1213 device
->flags
.bus_address
= 1;
1219 * Some devices don't reliably have _HIDs & _CIDs, so add
1220 * synthetic HIDs to make sure drivers can find them.
1222 if (acpi_is_video_device(device
))
1223 acpi_add_id(device
, ACPI_VIDEO_HID
);
1224 else if (ACPI_SUCCESS(acpi_bay_match(device
)))
1225 acpi_add_id(device
, ACPI_BAY_HID
);
1226 else if (ACPI_SUCCESS(acpi_dock_match(device
)))
1227 acpi_add_id(device
, ACPI_DOCK_HID
);
1228 else if (!acpi_ibm_smbus_match(device
))
1229 acpi_add_id(device
, ACPI_SMBUS_IBM_HID
);
1230 else if (!acpi_device_hid(device
) &&
1231 ACPI_IS_ROOT_DEVICE(device
->parent
)) {
1232 acpi_add_id(device
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1233 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1234 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1238 case ACPI_BUS_TYPE_POWER
:
1239 acpi_add_id(device
, ACPI_POWER_HID
);
1241 case ACPI_BUS_TYPE_PROCESSOR
:
1242 acpi_add_id(device
, ACPI_PROCESSOR_OBJECT_HID
);
1244 case ACPI_BUS_TYPE_THERMAL
:
1245 acpi_add_id(device
, ACPI_THERMAL_HID
);
1247 case ACPI_BUS_TYPE_POWER_BUTTON
:
1248 acpi_add_id(device
, ACPI_BUTTON_HID_POWERF
);
1250 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1251 acpi_add_id(device
, ACPI_BUTTON_HID_SLEEPF
);
1256 static int acpi_device_set_context(struct acpi_device
*device
)
1263 * Attach this 'struct acpi_device' to the ACPI object. This makes
1264 * resolutions from handle->device very efficient. Fixed hardware
1265 * devices have no handles, so we skip them.
1267 if (!device
->handle
)
1270 status
= acpi_attach_data(device
->handle
,
1271 acpi_bus_data_handler
, device
);
1272 if (ACPI_SUCCESS(status
))
1275 printk(KERN_ERR PREFIX
"Error attaching device data\n");
1279 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
1284 dev
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1285 device_release_driver(&dev
->dev
);
1291 * unbind _ADR-Based Devices when hot removal
1293 if (dev
->flags
.bus_address
) {
1294 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
1295 dev
->parent
->ops
.unbind(dev
);
1297 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
1302 static int acpi_add_single_object(struct acpi_device
**child
,
1303 acpi_handle handle
, int type
,
1304 unsigned long long sta
,
1305 struct acpi_bus_ops
*ops
)
1308 struct acpi_device
*device
;
1309 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1311 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1313 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1317 INIT_LIST_HEAD(&device
->pnp
.ids
);
1318 device
->device_type
= type
;
1319 device
->handle
= handle
;
1320 device
->parent
= acpi_bus_get_parent(handle
);
1321 device
->bus_ops
= *ops
; /* workround for not call .start */
1322 STRUCT_TO_INT(device
->status
) = sta
;
1324 acpi_device_get_busid(device
);
1329 * Note that we only look for object handles -- cannot evaluate objects
1330 * until we know the device is present and properly initialized.
1332 result
= acpi_bus_get_flags(device
);
1339 * TBD: Synch with Core's enumeration/initialization process.
1341 acpi_device_set_id(device
);
1347 if (device
->flags
.power_manageable
) {
1348 result
= acpi_bus_get_power_flags(device
);
1354 * Wakeup device management
1355 *-----------------------
1357 acpi_bus_get_wakeup_device_flags(device
);
1360 * Performance Management
1361 * ----------------------
1363 if (device
->flags
.performance_manageable
) {
1364 result
= acpi_bus_get_perf_flags(device
);
1369 if ((result
= acpi_device_set_context(device
)))
1372 result
= acpi_device_register(device
);
1375 * Bind _ADR-Based Devices when hot add
1377 if (device
->flags
.bus_address
) {
1378 if (device
->parent
&& device
->parent
->ops
.bind
)
1379 device
->parent
->ops
.bind(device
);
1384 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1385 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1386 "Adding %s [%s] parent %s\n", dev_name(&device
->dev
),
1387 (char *) buffer
.pointer
,
1388 device
->parent
? dev_name(&device
->parent
->dev
) :
1390 kfree(buffer
.pointer
);
1393 acpi_device_release(&device
->dev
);
1398 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1399 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1401 static void acpi_bus_add_power_resource(acpi_handle handle
)
1403 struct acpi_bus_ops ops
= {
1407 struct acpi_device
*device
= NULL
;
1409 acpi_bus_get_device(handle
, &device
);
1411 acpi_add_single_object(&device
, handle
, ACPI_BUS_TYPE_POWER
,
1412 ACPI_STA_DEFAULT
, &ops
);
1415 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1416 unsigned long long *sta
)
1419 acpi_object_type acpi_type
;
1421 status
= acpi_get_type(handle
, &acpi_type
);
1422 if (ACPI_FAILURE(status
))
1425 switch (acpi_type
) {
1426 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1427 case ACPI_TYPE_DEVICE
:
1428 *type
= ACPI_BUS_TYPE_DEVICE
;
1429 status
= acpi_bus_get_status_handle(handle
, sta
);
1430 if (ACPI_FAILURE(status
))
1433 case ACPI_TYPE_PROCESSOR
:
1434 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1435 status
= acpi_bus_get_status_handle(handle
, sta
);
1436 if (ACPI_FAILURE(status
))
1439 case ACPI_TYPE_THERMAL
:
1440 *type
= ACPI_BUS_TYPE_THERMAL
;
1441 *sta
= ACPI_STA_DEFAULT
;
1443 case ACPI_TYPE_POWER
:
1444 *type
= ACPI_BUS_TYPE_POWER
;
1445 *sta
= ACPI_STA_DEFAULT
;
1454 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl
,
1455 void *context
, void **return_value
)
1457 struct acpi_bus_ops
*ops
= context
;
1459 unsigned long long sta
;
1460 struct acpi_device
*device
;
1464 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1468 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1469 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
)) {
1470 struct acpi_device_wakeup wakeup
;
1473 status
= acpi_get_handle(handle
, "_PRW", &temp
);
1474 if (ACPI_SUCCESS(status
))
1475 acpi_bus_extract_wakeup_device_power_package(handle
,
1477 return AE_CTRL_DEPTH
;
1481 * We may already have an acpi_device from a previous enumeration. If
1482 * so, we needn't add it again, but we may still have to start it.
1485 acpi_bus_get_device(handle
, &device
);
1486 if (ops
->acpi_op_add
&& !device
)
1487 acpi_add_single_object(&device
, handle
, type
, sta
, ops
);
1490 return AE_CTRL_DEPTH
;
1492 if (ops
->acpi_op_start
&& !(ops
->acpi_op_add
)) {
1493 status
= acpi_start_single_object(device
);
1494 if (ACPI_FAILURE(status
))
1495 return AE_CTRL_DEPTH
;
1499 *return_value
= device
;
1503 static int acpi_bus_scan(acpi_handle handle
, struct acpi_bus_ops
*ops
,
1504 struct acpi_device
**child
)
1507 void *device
= NULL
;
1509 status
= acpi_bus_check_add(handle
, 0, ops
, &device
);
1510 if (ACPI_SUCCESS(status
))
1511 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1512 acpi_bus_check_add
, NULL
, ops
, &device
);
1524 * acpi_bus_add and acpi_bus_start
1526 * scan a given ACPI tree and (probably recently hot-plugged)
1527 * create and add or starts found devices.
1529 * If no devices were found -ENODEV is returned which does not
1530 * mean that this is a real error, there just have been no suitable
1531 * ACPI objects in the table trunk from which the kernel could create
1532 * a device and add/start an appropriate driver.
1536 acpi_bus_add(struct acpi_device
**child
,
1537 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1539 struct acpi_bus_ops ops
;
1541 memset(&ops
, 0, sizeof(ops
));
1542 ops
.acpi_op_add
= 1;
1544 return acpi_bus_scan(handle
, &ops
, child
);
1546 EXPORT_SYMBOL(acpi_bus_add
);
1548 int acpi_bus_start(struct acpi_device
*device
)
1550 struct acpi_bus_ops ops
;
1556 memset(&ops
, 0, sizeof(ops
));
1557 ops
.acpi_op_start
= 1;
1559 result
= acpi_bus_scan(device
->handle
, &ops
, NULL
);
1561 acpi_update_all_gpes();
1565 EXPORT_SYMBOL(acpi_bus_start
);
1567 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1570 struct acpi_device
*parent
, *child
;
1571 acpi_handle phandle
, chandle
;
1572 acpi_object_type type
;
1577 phandle
= start
->handle
;
1578 child
= chandle
= NULL
;
1580 while ((level
> 0) && parent
&& (!err
)) {
1581 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1585 * If this scope is exhausted then move our way back up.
1587 if (ACPI_FAILURE(status
)) {
1590 acpi_get_parent(phandle
, &phandle
);
1592 parent
= parent
->parent
;
1595 err
= acpi_bus_remove(child
, rmdevice
);
1597 err
= acpi_bus_remove(child
, 1);
1602 status
= acpi_get_type(chandle
, &type
);
1603 if (ACPI_FAILURE(status
)) {
1607 * If there is a device corresponding to chandle then
1608 * parse it (depth-first).
1610 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1620 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1622 static int acpi_bus_scan_fixed(void)
1625 struct acpi_device
*device
= NULL
;
1626 struct acpi_bus_ops ops
;
1628 memset(&ops
, 0, sizeof(ops
));
1629 ops
.acpi_op_add
= 1;
1630 ops
.acpi_op_start
= 1;
1633 * Enumerate all fixed-feature devices.
1635 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1636 result
= acpi_add_single_object(&device
, NULL
,
1637 ACPI_BUS_TYPE_POWER_BUTTON
,
1640 device_init_wakeup(&device
->dev
, true);
1643 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1644 result
= acpi_add_single_object(&device
, NULL
,
1645 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1653 int __init
acpi_scan_init(void)
1656 struct acpi_bus_ops ops
;
1658 memset(&ops
, 0, sizeof(ops
));
1659 ops
.acpi_op_add
= 1;
1660 ops
.acpi_op_start
= 1;
1662 result
= bus_register(&acpi_bus_type
);
1664 /* We don't want to quit even if we failed to add suspend/resume */
1665 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1671 * Enumerate devices in the ACPI namespace.
1673 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
, &ops
, &acpi_root
);
1676 result
= acpi_bus_scan_fixed();
1679 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);
1681 acpi_update_all_gpes();