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 static DEFINE_MUTEX(acpi_scan_lock
);
35 static LIST_HEAD(acpi_scan_handlers_list
);
36 DEFINE_MUTEX(acpi_device_lock
);
37 LIST_HEAD(acpi_wakeup_device_list
);
39 struct acpi_device_bus_id
{
41 unsigned int instance_no
;
42 struct list_head node
;
45 int acpi_scan_add_handler(struct acpi_scan_handler
*handler
)
47 if (!handler
|| !handler
->attach
)
50 list_add_tail(&handler
->list_node
, &acpi_scan_handlers_list
);
55 * Creates hid/cid(s) string needed for modalias and uevent
56 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
57 * char *modalias: "acpi:IBM0001:ACPI0001"
59 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
64 struct acpi_hardware_id
*id
;
66 if (list_empty(&acpi_dev
->pnp
.ids
))
69 len
= snprintf(modalias
, size
, "acpi:");
72 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
73 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
74 if (count
< 0 || count
>= size
)
85 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
86 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
89 /* Device has no HID and no CID or string is >1024 */
90 len
= create_modalias(acpi_dev
, buf
, 1024);
96 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
99 * acpi_bus_hot_remove_device: hot-remove a device and its children
100 * @context: struct acpi_eject_event pointer (freed in this func)
102 * Hot-remove a device and its children. This function frees up the
103 * memory space passed by arg context, so that the caller may call
104 * this function asynchronously through acpi_os_hotplug_execute().
106 void acpi_bus_hot_remove_device(void *context
)
108 struct acpi_eject_event
*ej_event
= (struct acpi_eject_event
*) context
;
109 struct acpi_device
*device
= ej_event
->device
;
110 acpi_handle handle
= device
->handle
;
112 struct acpi_object_list arg_list
;
113 union acpi_object arg
;
114 acpi_status status
= AE_OK
;
115 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
; /* default */
117 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
118 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
120 acpi_bus_trim(device
);
121 /* Device node has been released. */
124 /* power off device */
125 status
= acpi_evaluate_object(handle
, "_PS3", NULL
, NULL
);
126 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
)
127 printk(KERN_WARNING PREFIX
128 "Power-off device failed\n");
130 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_LCK", &temp
))) {
132 arg_list
.pointer
= &arg
;
133 arg
.type
= ACPI_TYPE_INTEGER
;
134 arg
.integer
.value
= 0;
135 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
139 arg_list
.pointer
= &arg
;
140 arg
.type
= ACPI_TYPE_INTEGER
;
141 arg
.integer
.value
= 1;
146 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
147 if (ACPI_FAILURE(status
)) {
148 if (status
!= AE_NOT_FOUND
)
149 printk(KERN_WARNING PREFIX
150 "Eject device failed\n");
158 /* Inform firmware the hot-remove operation has completed w/ error */
159 (void) acpi_evaluate_hotplug_ost(handle
,
160 ej_event
->event
, ost_code
, NULL
);
164 EXPORT_SYMBOL(acpi_bus_hot_remove_device
);
166 static ssize_t
real_power_state_show(struct device
*dev
,
167 struct device_attribute
*attr
, char *buf
)
169 struct acpi_device
*adev
= to_acpi_device(dev
);
173 ret
= acpi_device_get_power(adev
, &state
);
177 return sprintf(buf
, "%s\n", acpi_power_state_string(state
));
180 static DEVICE_ATTR(real_power_state
, 0444, real_power_state_show
, NULL
);
182 static ssize_t
power_state_show(struct device
*dev
,
183 struct device_attribute
*attr
, char *buf
)
185 struct acpi_device
*adev
= to_acpi_device(dev
);
187 return sprintf(buf
, "%s\n", acpi_power_state_string(adev
->power
.state
));
190 static DEVICE_ATTR(power_state
, 0444, power_state_show
, NULL
);
193 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
194 const char *buf
, size_t count
)
198 acpi_object_type type
= 0;
199 struct acpi_device
*acpi_device
= to_acpi_device(d
);
200 struct acpi_eject_event
*ej_event
;
202 if ((!count
) || (buf
[0] != '1')) {
206 if (acpi_device
->driver
== NULL
) {
211 status
= acpi_get_type(acpi_device
->handle
, &type
);
212 if (ACPI_FAILURE(status
) || (!acpi_device
->flags
.ejectable
)) {
217 ej_event
= kmalloc(sizeof(*ej_event
), GFP_KERNEL
);
223 ej_event
->device
= acpi_device
;
224 if (acpi_device
->flags
.eject_pending
) {
225 /* event originated from ACPI eject notification */
226 ej_event
->event
= ACPI_NOTIFY_EJECT_REQUEST
;
227 acpi_device
->flags
.eject_pending
= 0;
229 /* event originated from user */
230 ej_event
->event
= ACPI_OST_EC_OSPM_EJECT
;
231 (void) acpi_evaluate_hotplug_ost(acpi_device
->handle
,
232 ej_event
->event
, ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
235 acpi_os_hotplug_execute(acpi_bus_hot_remove_device
, (void *)ej_event
);
240 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
243 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
244 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
246 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
248 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
250 static ssize_t
acpi_device_uid_show(struct device
*dev
,
251 struct device_attribute
*attr
, char *buf
)
253 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
255 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
257 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
259 static ssize_t
acpi_device_adr_show(struct device
*dev
,
260 struct device_attribute
*attr
, char *buf
)
262 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
264 return sprintf(buf
, "0x%08x\n",
265 (unsigned int)(acpi_dev
->pnp
.bus_address
));
267 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
270 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
271 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
272 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
275 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
279 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
284 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
286 /* sysfs file that shows description text from the ACPI _STR method */
287 static ssize_t
description_show(struct device
*dev
,
288 struct device_attribute
*attr
,
290 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
293 if (acpi_dev
->pnp
.str_obj
== NULL
)
297 * The _STR object contains a Unicode identifier for a device.
298 * We need to convert to utf-8 so it can be displayed.
300 result
= utf16s_to_utf8s(
301 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
302 acpi_dev
->pnp
.str_obj
->buffer
.length
,
303 UTF16_LITTLE_ENDIAN
, buf
,
306 buf
[result
++] = '\n';
310 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
313 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
315 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
317 return sprintf(buf
, "%lu\n", acpi_dev
->pnp
.sun
);
319 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
321 static int acpi_device_setup_files(struct acpi_device
*dev
)
323 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
326 unsigned long long sun
;
330 * Devices gotten from FADT don't have a "path" attribute
333 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
338 if (!list_empty(&dev
->pnp
.ids
)) {
339 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
343 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
349 * If device has _STR, 'description' file is created
351 status
= acpi_get_handle(dev
->handle
, "_STR", &temp
);
352 if (ACPI_SUCCESS(status
)) {
353 status
= acpi_evaluate_object(dev
->handle
, "_STR",
355 if (ACPI_FAILURE(status
))
356 buffer
.pointer
= NULL
;
357 dev
->pnp
.str_obj
= buffer
.pointer
;
358 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
363 if (dev
->flags
.bus_address
)
364 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
365 if (dev
->pnp
.unique_id
)
366 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
368 status
= acpi_evaluate_integer(dev
->handle
, "_SUN", NULL
, &sun
);
369 if (ACPI_SUCCESS(status
)) {
370 dev
->pnp
.sun
= (unsigned long)sun
;
371 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
375 dev
->pnp
.sun
= (unsigned long)-1;
379 * If device has _EJ0, 'eject' file is created that is used to trigger
380 * hot-removal function from userland.
382 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
383 if (ACPI_SUCCESS(status
)) {
384 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
389 if (dev
->flags
.power_manageable
) {
390 result
= device_create_file(&dev
->dev
, &dev_attr_power_state
);
394 if (dev
->power
.flags
.power_resources
)
395 result
= device_create_file(&dev
->dev
,
396 &dev_attr_real_power_state
);
403 static void acpi_device_remove_files(struct acpi_device
*dev
)
408 if (dev
->flags
.power_manageable
) {
409 device_remove_file(&dev
->dev
, &dev_attr_power_state
);
410 if (dev
->power
.flags
.power_resources
)
411 device_remove_file(&dev
->dev
,
412 &dev_attr_real_power_state
);
416 * If device has _STR, remove 'description' file
418 status
= acpi_get_handle(dev
->handle
, "_STR", &temp
);
419 if (ACPI_SUCCESS(status
)) {
420 kfree(dev
->pnp
.str_obj
);
421 device_remove_file(&dev
->dev
, &dev_attr_description
);
424 * If device has _EJ0, remove 'eject' file.
426 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
427 if (ACPI_SUCCESS(status
))
428 device_remove_file(&dev
->dev
, &dev_attr_eject
);
430 status
= acpi_get_handle(dev
->handle
, "_SUN", &temp
);
431 if (ACPI_SUCCESS(status
))
432 device_remove_file(&dev
->dev
, &dev_attr_sun
);
434 if (dev
->pnp
.unique_id
)
435 device_remove_file(&dev
->dev
, &dev_attr_uid
);
436 if (dev
->flags
.bus_address
)
437 device_remove_file(&dev
->dev
, &dev_attr_adr
);
438 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
439 device_remove_file(&dev
->dev
, &dev_attr_hid
);
441 device_remove_file(&dev
->dev
, &dev_attr_path
);
443 /* --------------------------------------------------------------------------
445 -------------------------------------------------------------------------- */
447 static const struct acpi_device_id
*__acpi_match_device(
448 struct acpi_device
*device
, const struct acpi_device_id
*ids
)
450 const struct acpi_device_id
*id
;
451 struct acpi_hardware_id
*hwid
;
454 * If the device is not present, it is unnecessary to load device
457 if (!device
->status
.present
)
460 for (id
= ids
; id
->id
[0]; id
++)
461 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
462 if (!strcmp((char *) id
->id
, hwid
->id
))
469 * acpi_match_device - Match a struct device against a given list of ACPI IDs
470 * @ids: Array of struct acpi_device_id object to match against.
471 * @dev: The device structure to match.
473 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
474 * object for that handle and use that object to match against a given list of
477 * Return a pointer to the first matching ID on success or %NULL on failure.
479 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
480 const struct device
*dev
)
482 struct acpi_device
*adev
;
484 if (!ids
|| !ACPI_HANDLE(dev
)
485 || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev
), &adev
)))
488 return __acpi_match_device(adev
, ids
);
490 EXPORT_SYMBOL_GPL(acpi_match_device
);
492 int acpi_match_device_ids(struct acpi_device
*device
,
493 const struct acpi_device_id
*ids
)
495 return __acpi_match_device(device
, ids
) ? 0 : -ENOENT
;
497 EXPORT_SYMBOL(acpi_match_device_ids
);
499 void acpi_free_ids(struct acpi_device
*device
)
501 struct acpi_hardware_id
*id
, *tmp
;
503 list_for_each_entry_safe(id
, tmp
, &device
->pnp
.ids
, list
) {
507 kfree(device
->pnp
.unique_id
);
510 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
514 if (device
->wakeup
.flags
.valid
)
515 acpi_power_resources_list_free(&device
->wakeup
.resources
);
517 if (!device
->flags
.power_manageable
)
520 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
521 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
522 acpi_power_resources_list_free(&ps
->resources
);
526 static void acpi_device_release(struct device
*dev
)
528 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
530 acpi_free_ids(acpi_dev
);
531 acpi_free_power_resources_lists(acpi_dev
);
535 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
537 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
538 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
540 return acpi_dev
->flags
.match_driver
541 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
544 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
546 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
549 if (list_empty(&acpi_dev
->pnp
.ids
))
552 if (add_uevent_var(env
, "MODALIAS="))
554 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
555 sizeof(env
->buf
) - env
->buflen
);
556 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
562 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
564 struct acpi_device
*device
= data
;
566 device
->driver
->ops
.notify(device
, event
);
569 static acpi_status
acpi_device_notify_fixed(void *data
)
571 struct acpi_device
*device
= data
;
573 /* Fixed hardware devices have no handles */
574 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
578 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
582 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
584 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
585 acpi_device_notify_fixed
,
587 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
589 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
590 acpi_device_notify_fixed
,
593 status
= acpi_install_notify_handler(device
->handle
,
598 if (ACPI_FAILURE(status
))
603 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
605 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
606 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
607 acpi_device_notify_fixed
);
608 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
609 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
610 acpi_device_notify_fixed
);
612 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
616 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
617 static int acpi_device_probe(struct device
* dev
)
619 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
620 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
623 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
625 if (acpi_drv
->ops
.notify
) {
626 ret
= acpi_device_install_notify_handler(acpi_dev
);
628 if (acpi_drv
->ops
.remove
)
629 acpi_drv
->ops
.remove(acpi_dev
);
634 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
635 "Found driver [%s] for device [%s]\n",
636 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
642 static int acpi_device_remove(struct device
* dev
)
644 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
645 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
648 if (acpi_drv
->ops
.notify
)
649 acpi_device_remove_notify_handler(acpi_dev
);
650 if (acpi_drv
->ops
.remove
)
651 acpi_drv
->ops
.remove(acpi_dev
);
653 acpi_dev
->driver
= NULL
;
654 acpi_dev
->driver_data
= NULL
;
660 struct bus_type acpi_bus_type
= {
662 .match
= acpi_bus_match
,
663 .probe
= acpi_device_probe
,
664 .remove
= acpi_device_remove
,
665 .uevent
= acpi_device_uevent
,
668 int acpi_device_add(struct acpi_device
*device
,
669 void (*release
)(struct device
*))
672 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
675 if (device
->handle
) {
678 status
= acpi_attach_data(device
->handle
, acpi_bus_data_handler
,
680 if (ACPI_FAILURE(status
)) {
681 acpi_handle_err(device
->handle
,
682 "Unable to attach device data\n");
690 * Link this device to its parent and siblings.
692 INIT_LIST_HEAD(&device
->children
);
693 INIT_LIST_HEAD(&device
->node
);
694 INIT_LIST_HEAD(&device
->wakeup_list
);
695 INIT_LIST_HEAD(&device
->physical_node_list
);
696 mutex_init(&device
->physical_node_lock
);
697 INIT_LIST_HEAD(&device
->power_dependent
);
699 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
701 pr_err(PREFIX
"Memory allocation error\n");
706 mutex_lock(&acpi_device_lock
);
708 * Find suitable bus_id and instance number in acpi_bus_id_list
709 * If failed, create one and link it into acpi_bus_id_list
711 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
712 if (!strcmp(acpi_device_bus_id
->bus_id
,
713 acpi_device_hid(device
))) {
714 acpi_device_bus_id
->instance_no
++;
721 acpi_device_bus_id
= new_bus_id
;
722 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
723 acpi_device_bus_id
->instance_no
= 0;
724 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
726 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
729 list_add_tail(&device
->node
, &device
->parent
->children
);
731 if (device
->wakeup
.flags
.valid
)
732 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
733 mutex_unlock(&acpi_device_lock
);
736 device
->dev
.parent
= &device
->parent
->dev
;
737 device
->dev
.bus
= &acpi_bus_type
;
738 device
->dev
.release
= release
;
739 result
= device_add(&device
->dev
);
741 dev_err(&device
->dev
, "Error registering device\n");
745 result
= acpi_device_setup_files(device
);
747 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
748 dev_name(&device
->dev
));
750 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
754 mutex_lock(&acpi_device_lock
);
756 list_del(&device
->node
);
757 list_del(&device
->wakeup_list
);
758 mutex_unlock(&acpi_device_lock
);
761 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
765 static void acpi_device_unregister(struct acpi_device
*device
)
767 mutex_lock(&acpi_device_lock
);
769 list_del(&device
->node
);
771 list_del(&device
->wakeup_list
);
772 mutex_unlock(&acpi_device_lock
);
774 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
776 acpi_power_add_remove_device(device
, false);
777 acpi_device_remove_files(device
);
779 device
->remove(device
);
781 device_del(&device
->dev
);
783 * Drop the reference counts of all power resources the device depends
784 * on and turn off the ones that have no more references.
786 acpi_power_transition(device
, ACPI_STATE_D3_COLD
);
787 put_device(&device
->dev
);
790 /* --------------------------------------------------------------------------
792 -------------------------------------------------------------------------- */
794 * acpi_bus_driver_init - add a device to a driver
795 * @device: the device to add and initialize
796 * @driver: driver for the device
798 * Used to initialize a device via its device driver. Called whenever a
799 * driver is bound to a device. Invokes the driver's add() ops.
802 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
806 if (!device
|| !driver
)
809 if (!driver
->ops
.add
)
812 result
= driver
->ops
.add(device
);
814 device
->driver
= NULL
;
815 device
->driver_data
= NULL
;
819 device
->driver
= driver
;
822 * TBD - Configuration Management: Assign resources to device based
823 * upon possible configuration and currently allocated resources.
826 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
827 "Driver successfully bound to device\n"));
832 * acpi_bus_register_driver - register a driver with the ACPI bus
833 * @driver: driver being registered
835 * Registers a driver with the ACPI bus. Searches the namespace for all
836 * devices that match the driver's criteria and binds. Returns zero for
837 * success or a negative error status for failure.
839 int acpi_bus_register_driver(struct acpi_driver
*driver
)
845 driver
->drv
.name
= driver
->name
;
846 driver
->drv
.bus
= &acpi_bus_type
;
847 driver
->drv
.owner
= driver
->owner
;
849 ret
= driver_register(&driver
->drv
);
853 EXPORT_SYMBOL(acpi_bus_register_driver
);
856 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
857 * @driver: driver to unregister
859 * Unregisters a driver with the ACPI bus. Searches the namespace for all
860 * devices that match the driver's criteria and unbinds.
862 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
864 driver_unregister(&driver
->drv
);
867 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
869 /* --------------------------------------------------------------------------
871 -------------------------------------------------------------------------- */
872 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
874 struct acpi_device
*device
= NULL
;
878 * Fixed hardware devices do not appear in the namespace and do not
879 * have handles, but we fabricate acpi_devices for them, so we have
880 * to deal with them specially.
886 status
= acpi_get_parent(handle
, &handle
);
887 if (ACPI_FAILURE(status
))
888 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
889 } while (acpi_bus_get_device(handle
, &device
));
894 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
898 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
899 union acpi_object
*obj
;
901 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
902 if (ACPI_FAILURE(status
))
905 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
906 if (ACPI_SUCCESS(status
)) {
907 obj
= buffer
.pointer
;
908 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
910 kfree(buffer
.pointer
);
914 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
916 void acpi_bus_data_handler(acpi_handle handle
, void *context
)
924 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
925 struct acpi_device_wakeup
*wakeup
)
927 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
928 union acpi_object
*package
= NULL
;
929 union acpi_object
*element
= NULL
;
936 INIT_LIST_HEAD(&wakeup
->resources
);
939 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
940 if (ACPI_FAILURE(status
)) {
941 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
945 package
= (union acpi_object
*)buffer
.pointer
;
947 if (!package
|| package
->package
.count
< 2)
950 element
= &(package
->package
.elements
[0]);
954 if (element
->type
== ACPI_TYPE_PACKAGE
) {
955 if ((element
->package
.count
< 2) ||
956 (element
->package
.elements
[0].type
!=
957 ACPI_TYPE_LOCAL_REFERENCE
)
958 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
962 element
->package
.elements
[0].reference
.handle
;
964 (u32
) element
->package
.elements
[1].integer
.value
;
965 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
966 wakeup
->gpe_device
= NULL
;
967 wakeup
->gpe_number
= element
->integer
.value
;
972 element
= &(package
->package
.elements
[1]);
973 if (element
->type
!= ACPI_TYPE_INTEGER
)
976 wakeup
->sleep_state
= element
->integer
.value
;
978 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
982 if (!list_empty(&wakeup
->resources
)) {
985 sleep_state
= acpi_power_min_system_level(&wakeup
->resources
);
986 if (sleep_state
< wakeup
->sleep_state
) {
987 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
988 "(S%d) by S%d from power resources\n",
989 (int)wakeup
->sleep_state
, sleep_state
);
990 wakeup
->sleep_state
= sleep_state
;
993 acpi_setup_gpe_for_wake(handle
, wakeup
->gpe_device
, wakeup
->gpe_number
);
996 kfree(buffer
.pointer
);
1000 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
1002 struct acpi_device_id button_device_ids
[] = {
1009 acpi_event_status event_status
;
1011 device
->wakeup
.flags
.notifier_present
= 0;
1013 /* Power button, Lid switch always enable wakeup */
1014 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1015 device
->wakeup
.flags
.run_wake
= 1;
1016 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1017 /* Do not use Lid/sleep button for S5 wakeup */
1018 if (device
->wakeup
.sleep_state
== ACPI_STATE_S5
)
1019 device
->wakeup
.sleep_state
= ACPI_STATE_S4
;
1021 device_set_wakeup_capable(&device
->dev
, true);
1025 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
1026 device
->wakeup
.gpe_number
,
1028 if (status
== AE_OK
)
1029 device
->wakeup
.flags
.run_wake
=
1030 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
1033 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1036 acpi_status status
= 0;
1039 /* Presence of _PRW indicates wake capable */
1040 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
1041 if (ACPI_FAILURE(status
))
1044 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1047 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1051 device
->wakeup
.flags
.valid
= 1;
1052 device
->wakeup
.prepare_count
= 0;
1053 acpi_bus_set_run_wake_flags(device
);
1054 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1055 * system for the ACPI device with the _PRW object.
1056 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1057 * So it is necessary to call _DSW object first. Only when it is not
1058 * present will the _PSW object used.
1060 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1062 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1063 "error in _DSW or _PSW evaluation\n"));
1066 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1068 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1069 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1070 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1074 INIT_LIST_HEAD(&ps
->resources
);
1076 /* Evaluate "_PRx" to get referenced power resources */
1077 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1078 if (ACPI_SUCCESS(status
)) {
1079 union acpi_object
*package
= buffer
.pointer
;
1081 if (buffer
.length
&& package
1082 && package
->type
== ACPI_TYPE_PACKAGE
1083 && package
->package
.count
) {
1084 int err
= acpi_extract_power_resources(package
, 0,
1087 device
->power
.flags
.power_resources
= 1;
1089 ACPI_FREE(buffer
.pointer
);
1092 /* Evaluate "_PSx" to see if we can do explicit sets */
1094 status
= acpi_get_handle(device
->handle
, pathname
, &handle
);
1095 if (ACPI_SUCCESS(status
))
1096 ps
->flags
.explicit_set
= 1;
1099 * State is valid if there are means to put the device into it.
1100 * D3hot is only valid if _PR3 present.
1102 if (!list_empty(&ps
->resources
)
1103 || (ps
->flags
.explicit_set
&& state
< ACPI_STATE_D3_HOT
)) {
1104 ps
->flags
.valid
= 1;
1105 ps
->flags
.os_accessible
= 1;
1108 ps
->power
= -1; /* Unknown - driver assigned */
1109 ps
->latency
= -1; /* Unknown - driver assigned */
1112 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1118 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1119 status
= acpi_get_handle(device
->handle
, "_PS0", &handle
);
1120 if (ACPI_FAILURE(status
)) {
1121 status
= acpi_get_handle(device
->handle
, "_PR0", &handle
);
1122 if (ACPI_FAILURE(status
))
1126 device
->flags
.power_manageable
= 1;
1129 * Power Management Flags
1131 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
1132 if (ACPI_SUCCESS(status
))
1133 device
->power
.flags
.explicit_get
= 1;
1134 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
1135 if (ACPI_SUCCESS(status
))
1136 device
->power
.flags
.inrush_current
= 1;
1139 * Enumerate supported power management states
1141 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1142 acpi_bus_init_power_state(device
, i
);
1144 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1146 /* Set defaults for D0 and D3 states (always valid) */
1147 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1148 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1149 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
1150 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
1152 /* Set D3cold's explicit_set flag if _PS3 exists. */
1153 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1154 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1156 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1157 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1158 device
->power
.flags
.power_resources
)
1159 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1161 acpi_bus_init_power(device
);
1164 static void acpi_bus_get_flags(struct acpi_device
*device
)
1166 acpi_status status
= AE_OK
;
1167 acpi_handle temp
= NULL
;
1169 /* Presence of _STA indicates 'dynamic_status' */
1170 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
1171 if (ACPI_SUCCESS(status
))
1172 device
->flags
.dynamic_status
= 1;
1174 /* Presence of _RMV indicates 'removable' */
1175 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
1176 if (ACPI_SUCCESS(status
))
1177 device
->flags
.removable
= 1;
1179 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1180 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
1181 if (ACPI_SUCCESS(status
))
1182 device
->flags
.ejectable
= 1;
1184 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
1185 if (ACPI_SUCCESS(status
))
1186 device
->flags
.ejectable
= 1;
1190 static void acpi_device_get_busid(struct acpi_device
*device
)
1192 char bus_id
[5] = { '?', 0 };
1193 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1199 * The device's Bus ID is simply the object name.
1200 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1202 if (ACPI_IS_ROOT_DEVICE(device
)) {
1203 strcpy(device
->pnp
.bus_id
, "ACPI");
1207 switch (device
->device_type
) {
1208 case ACPI_BUS_TYPE_POWER_BUTTON
:
1209 strcpy(device
->pnp
.bus_id
, "PWRF");
1211 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1212 strcpy(device
->pnp
.bus_id
, "SLPF");
1215 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1216 /* Clean up trailing underscores (if any) */
1217 for (i
= 3; i
> 1; i
--) {
1218 if (bus_id
[i
] == '_')
1223 strcpy(device
->pnp
.bus_id
, bus_id
);
1229 * acpi_bay_match - see if a device is an ejectable driver bay
1231 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1232 * then we can safely call it an ejectable drive bay
1234 static int acpi_bay_match(struct acpi_device
*device
){
1238 acpi_handle phandle
;
1240 handle
= device
->handle
;
1242 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
1243 if (ACPI_FAILURE(status
))
1246 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
1247 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
1248 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
1249 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
1252 if (acpi_get_parent(handle
, &phandle
))
1255 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
1256 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
1257 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
1258 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
1265 * acpi_dock_match - see if a device has a _DCK method
1267 static int acpi_dock_match(struct acpi_device
*device
)
1270 return acpi_get_handle(device
->handle
, "_DCK", &tmp
);
1273 const char *acpi_device_hid(struct acpi_device
*device
)
1275 struct acpi_hardware_id
*hid
;
1277 if (list_empty(&device
->pnp
.ids
))
1280 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1283 EXPORT_SYMBOL(acpi_device_hid
);
1285 static void acpi_add_id(struct acpi_device
*device
, const char *dev_id
)
1287 struct acpi_hardware_id
*id
;
1289 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1293 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1299 list_add_tail(&id
->list
, &device
->pnp
.ids
);
1303 * Old IBM workstations have a DSDT bug wherein the SMBus object
1304 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1305 * prefix. Work around this.
1307 static int acpi_ibm_smbus_match(struct acpi_device
*device
)
1309 acpi_handle h_dummy
;
1310 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1313 if (!dmi_name_in_vendors("IBM"))
1316 /* Look for SMBS object */
1317 result
= acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &path
);
1321 if (strcmp("SMBS", path
.pointer
)) {
1326 /* Does it have the necessary (but misnamed) methods? */
1328 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBI", &h_dummy
)) &&
1329 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBR", &h_dummy
)) &&
1330 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBW", &h_dummy
)))
1333 kfree(path
.pointer
);
1337 static void acpi_device_set_id(struct acpi_device
*device
)
1340 struct acpi_device_info
*info
;
1341 struct acpi_pnp_device_id_list
*cid_list
;
1344 switch (device
->device_type
) {
1345 case ACPI_BUS_TYPE_DEVICE
:
1346 if (ACPI_IS_ROOT_DEVICE(device
)) {
1347 acpi_add_id(device
, ACPI_SYSTEM_HID
);
1351 status
= acpi_get_object_info(device
->handle
, &info
);
1352 if (ACPI_FAILURE(status
)) {
1353 printk(KERN_ERR PREFIX
"%s: Error reading device info\n", __func__
);
1357 if (info
->valid
& ACPI_VALID_HID
)
1358 acpi_add_id(device
, info
->hardware_id
.string
);
1359 if (info
->valid
& ACPI_VALID_CID
) {
1360 cid_list
= &info
->compatible_id_list
;
1361 for (i
= 0; i
< cid_list
->count
; i
++)
1362 acpi_add_id(device
, cid_list
->ids
[i
].string
);
1364 if (info
->valid
& ACPI_VALID_ADR
) {
1365 device
->pnp
.bus_address
= info
->address
;
1366 device
->flags
.bus_address
= 1;
1368 if (info
->valid
& ACPI_VALID_UID
)
1369 device
->pnp
.unique_id
= kstrdup(info
->unique_id
.string
,
1375 * Some devices don't reliably have _HIDs & _CIDs, so add
1376 * synthetic HIDs to make sure drivers can find them.
1378 if (acpi_is_video_device(device
))
1379 acpi_add_id(device
, ACPI_VIDEO_HID
);
1380 else if (ACPI_SUCCESS(acpi_bay_match(device
)))
1381 acpi_add_id(device
, ACPI_BAY_HID
);
1382 else if (ACPI_SUCCESS(acpi_dock_match(device
)))
1383 acpi_add_id(device
, ACPI_DOCK_HID
);
1384 else if (!acpi_ibm_smbus_match(device
))
1385 acpi_add_id(device
, ACPI_SMBUS_IBM_HID
);
1386 else if (list_empty(&device
->pnp
.ids
) &&
1387 ACPI_IS_ROOT_DEVICE(device
->parent
)) {
1388 acpi_add_id(device
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1389 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1390 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1394 case ACPI_BUS_TYPE_POWER
:
1395 acpi_add_id(device
, ACPI_POWER_HID
);
1397 case ACPI_BUS_TYPE_PROCESSOR
:
1398 acpi_add_id(device
, ACPI_PROCESSOR_OBJECT_HID
);
1400 case ACPI_BUS_TYPE_THERMAL
:
1401 acpi_add_id(device
, ACPI_THERMAL_HID
);
1403 case ACPI_BUS_TYPE_POWER_BUTTON
:
1404 acpi_add_id(device
, ACPI_BUTTON_HID_POWERF
);
1406 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1407 acpi_add_id(device
, ACPI_BUTTON_HID_SLEEPF
);
1412 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
1413 int type
, unsigned long long sta
)
1415 INIT_LIST_HEAD(&device
->pnp
.ids
);
1416 device
->device_type
= type
;
1417 device
->handle
= handle
;
1418 device
->parent
= acpi_bus_get_parent(handle
);
1419 STRUCT_TO_INT(device
->status
) = sta
;
1420 acpi_device_get_busid(device
);
1421 acpi_device_set_id(device
);
1422 acpi_bus_get_flags(device
);
1423 device
->flags
.match_driver
= false;
1424 device_initialize(&device
->dev
);
1425 dev_set_uevent_suppress(&device
->dev
, true);
1428 void acpi_device_add_finalize(struct acpi_device
*device
)
1430 device
->flags
.match_driver
= true;
1431 dev_set_uevent_suppress(&device
->dev
, false);
1432 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
1435 static int acpi_add_single_object(struct acpi_device
**child
,
1436 acpi_handle handle
, int type
,
1437 unsigned long long sta
)
1440 struct acpi_device
*device
;
1441 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1443 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1445 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1449 acpi_init_device_object(device
, handle
, type
, sta
);
1450 acpi_bus_get_power_flags(device
);
1451 acpi_bus_get_wakeup_device_flags(device
);
1453 result
= acpi_device_add(device
, acpi_device_release
);
1455 acpi_device_release(&device
->dev
);
1459 acpi_power_add_remove_device(device
, true);
1460 acpi_device_add_finalize(device
);
1461 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1462 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
1463 dev_name(&device
->dev
), (char *) buffer
.pointer
,
1464 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
1465 kfree(buffer
.pointer
);
1470 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1471 unsigned long long *sta
)
1474 acpi_object_type acpi_type
;
1476 status
= acpi_get_type(handle
, &acpi_type
);
1477 if (ACPI_FAILURE(status
))
1480 switch (acpi_type
) {
1481 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1482 case ACPI_TYPE_DEVICE
:
1483 *type
= ACPI_BUS_TYPE_DEVICE
;
1484 status
= acpi_bus_get_status_handle(handle
, sta
);
1485 if (ACPI_FAILURE(status
))
1488 case ACPI_TYPE_PROCESSOR
:
1489 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1490 status
= acpi_bus_get_status_handle(handle
, sta
);
1491 if (ACPI_FAILURE(status
))
1494 case ACPI_TYPE_THERMAL
:
1495 *type
= ACPI_BUS_TYPE_THERMAL
;
1496 *sta
= ACPI_STA_DEFAULT
;
1498 case ACPI_TYPE_POWER
:
1499 *type
= ACPI_BUS_TYPE_POWER
;
1500 *sta
= ACPI_STA_DEFAULT
;
1509 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
1510 void *not_used
, void **return_value
)
1512 struct acpi_device
*device
= NULL
;
1514 unsigned long long sta
;
1518 acpi_bus_get_device(handle
, &device
);
1522 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1526 if (type
== ACPI_BUS_TYPE_POWER
) {
1527 acpi_add_power_resource(handle
);
1531 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1532 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
)) {
1533 struct acpi_device_wakeup wakeup
;
1536 status
= acpi_get_handle(handle
, "_PRW", &temp
);
1537 if (ACPI_SUCCESS(status
)) {
1538 acpi_bus_extract_wakeup_device_power_package(handle
,
1540 acpi_power_resources_list_free(&wakeup
.resources
);
1542 return AE_CTRL_DEPTH
;
1545 acpi_add_single_object(&device
, handle
, type
, sta
);
1547 return AE_CTRL_DEPTH
;
1551 *return_value
= device
;
1556 static int acpi_scan_do_attach_handler(struct acpi_device
*device
, char *id
)
1558 struct acpi_scan_handler
*handler
;
1560 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
) {
1561 const struct acpi_device_id
*devid
;
1563 for (devid
= handler
->ids
; devid
->id
[0]; devid
++) {
1566 if (strcmp((char *)devid
->id
, id
))
1569 ret
= handler
->attach(device
, devid
);
1571 device
->handler
= handler
;
1573 } else if (ret
< 0) {
1581 static int acpi_scan_attach_handler(struct acpi_device
*device
)
1583 struct acpi_hardware_id
*hwid
;
1586 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1587 ret
= acpi_scan_do_attach_handler(device
, hwid
->id
);
1595 static acpi_status
acpi_bus_device_attach(acpi_handle handle
, u32 lvl_not_used
,
1596 void *not_used
, void **ret_not_used
)
1598 struct acpi_device
*device
;
1599 unsigned long long sta_not_used
;
1603 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1604 * namespace walks prematurely.
1606 if (acpi_bus_type_and_status(handle
, &ret
, &sta_not_used
))
1609 if (acpi_bus_get_device(handle
, &device
))
1610 return AE_CTRL_DEPTH
;
1612 ret
= acpi_scan_attach_handler(device
);
1614 return ret
> 0 ? AE_OK
: AE_CTRL_DEPTH
;
1616 ret
= device_attach(&device
->dev
);
1617 return ret
>= 0 ? AE_OK
: AE_CTRL_DEPTH
;
1621 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1622 * @handle: Root of the namespace scope to scan.
1624 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1627 * If no devices were found, -ENODEV is returned, but it does not mean that
1628 * there has been a real error. There just have been no suitable ACPI objects
1629 * in the table trunk from which the kernel could create a device and add an
1630 * appropriate driver.
1632 int acpi_bus_scan(acpi_handle handle
)
1634 void *device
= NULL
;
1637 mutex_lock(&acpi_scan_lock
);
1639 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
1640 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1641 acpi_bus_check_add
, NULL
, NULL
, &device
);
1645 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle
, 0, NULL
, NULL
)))
1646 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1647 acpi_bus_device_attach
, NULL
, NULL
, NULL
);
1649 mutex_unlock(&acpi_scan_lock
);
1652 EXPORT_SYMBOL(acpi_bus_scan
);
1654 static acpi_status
acpi_bus_device_detach(acpi_handle handle
, u32 lvl_not_used
,
1655 void *not_used
, void **ret_not_used
)
1657 struct acpi_device
*device
= NULL
;
1659 if (!acpi_bus_get_device(handle
, &device
)) {
1660 struct acpi_scan_handler
*dev_handler
= device
->handler
;
1662 device
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1664 if (dev_handler
->detach
)
1665 dev_handler
->detach(device
);
1667 device
->handler
= NULL
;
1669 device_release_driver(&device
->dev
);
1675 static acpi_status
acpi_bus_remove(acpi_handle handle
, u32 lvl_not_used
,
1676 void *not_used
, void **ret_not_used
)
1678 struct acpi_device
*device
= NULL
;
1680 if (!acpi_bus_get_device(handle
, &device
))
1681 acpi_device_unregister(device
);
1686 void acpi_bus_trim(struct acpi_device
*start
)
1688 mutex_lock(&acpi_scan_lock
);
1691 * Execute acpi_bus_device_detach() as a post-order callback to detach
1692 * all ACPI drivers from the device nodes being removed.
1694 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
1695 acpi_bus_device_detach
, NULL
, NULL
);
1696 acpi_bus_device_detach(start
->handle
, 0, NULL
, NULL
);
1698 * Execute acpi_bus_remove() as a post-order callback to remove device
1699 * nodes in the given namespace scope.
1701 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
1702 acpi_bus_remove
, NULL
, NULL
);
1703 acpi_bus_remove(start
->handle
, 0, NULL
, NULL
);
1705 mutex_unlock(&acpi_scan_lock
);
1707 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1709 static int acpi_bus_scan_fixed(void)
1714 * Enumerate all fixed-feature devices.
1716 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
1717 struct acpi_device
*device
= NULL
;
1719 result
= acpi_add_single_object(&device
, NULL
,
1720 ACPI_BUS_TYPE_POWER_BUTTON
,
1725 result
= device_attach(&device
->dev
);
1729 device_init_wakeup(&device
->dev
, true);
1732 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
1733 struct acpi_device
*device
= NULL
;
1735 result
= acpi_add_single_object(&device
, NULL
,
1736 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1741 result
= device_attach(&device
->dev
);
1744 return result
< 0 ? result
: 0;
1747 int __init
acpi_scan_init(void)
1751 result
= bus_register(&acpi_bus_type
);
1753 /* We don't want to quit even if we failed to add suspend/resume */
1754 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1757 acpi_pci_root_init();
1758 acpi_pci_link_init();
1759 acpi_platform_init();
1763 * Enumerate devices in the ACPI namespace.
1765 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
1769 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
1773 result
= acpi_bus_scan_fixed();
1775 acpi_device_unregister(acpi_root
);
1779 acpi_update_all_gpes();