2 * scan.c - support for transforming the ACPI namespace into individual objects
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
14 #include <acpi/acpi_drivers.h>
18 #define _COMPONENT ACPI_BUS_COMPONENT
19 ACPI_MODULE_NAME("scan");
20 #define STRUCT_TO_INT(s) (*((int*)&s))
21 extern struct acpi_device
*acpi_root
;
23 #define ACPI_BUS_CLASS "system_bus"
24 #define ACPI_BUS_HID "LNXSYBUS"
25 #define ACPI_BUS_DEVICE_NAME "System Bus"
27 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
29 static const char *dummy_hid
= "device";
31 static LIST_HEAD(acpi_device_list
);
32 static LIST_HEAD(acpi_bus_id_list
);
33 DEFINE_MUTEX(acpi_device_lock
);
34 LIST_HEAD(acpi_wakeup_device_list
);
36 struct acpi_device_bus_id
{
38 unsigned int instance_no
;
39 struct list_head node
;
43 * Creates hid/cid(s) string needed for modalias and uevent
44 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
45 * char *modalias: "acpi:IBM0001:ACPI0001"
47 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
52 struct acpi_hardware_id
*id
;
54 if (list_empty(&acpi_dev
->pnp
.ids
))
57 len
= snprintf(modalias
, size
, "acpi:");
60 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
61 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
62 if (count
< 0 || count
>= size
)
73 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
74 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
77 /* Device has no HID and no CID or string is >1024 */
78 len
= create_modalias(acpi_dev
, buf
, 1024);
84 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
87 * acpi_bus_hot_remove_device: hot-remove a device and its children
88 * @context: struct acpi_eject_event pointer (freed in this func)
90 * Hot-remove a device and its children. This function frees up the
91 * memory space passed by arg context, so that the caller may call
92 * this function asynchronously through acpi_os_hotplug_execute().
94 void acpi_bus_hot_remove_device(void *context
)
96 struct acpi_eject_event
*ej_event
= (struct acpi_eject_event
*) context
;
97 struct acpi_device
*device
;
98 acpi_handle handle
= ej_event
->handle
;
99 struct acpi_object_list arg_list
;
100 union acpi_object arg
;
101 acpi_status status
= AE_OK
;
102 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
; /* default */
104 if (acpi_bus_get_device(handle
, &device
))
110 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
111 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
113 if (acpi_bus_trim(device
, 1)) {
114 printk(KERN_ERR PREFIX
115 "Removing device failed\n");
119 /* power off device */
120 status
= acpi_evaluate_object(handle
, "_PS3", NULL
, NULL
);
121 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
)
122 printk(KERN_WARNING PREFIX
123 "Power-off device failed\n");
125 if (device
->flags
.lockable
) {
127 arg_list
.pointer
= &arg
;
128 arg
.type
= ACPI_TYPE_INTEGER
;
129 arg
.integer
.value
= 0;
130 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
134 arg_list
.pointer
= &arg
;
135 arg
.type
= ACPI_TYPE_INTEGER
;
136 arg
.integer
.value
= 1;
141 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
142 if (ACPI_FAILURE(status
)) {
143 if (status
!= AE_NOT_FOUND
)
144 printk(KERN_WARNING PREFIX
145 "Eject device failed\n");
153 /* Inform firmware the hot-remove operation has completed w/ error */
154 (void) acpi_evaluate_hotplug_ost(handle
,
155 ej_event
->event
, ost_code
, NULL
);
161 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
162 const char *buf
, size_t count
)
166 acpi_object_type type
= 0;
167 struct acpi_device
*acpi_device
= to_acpi_device(d
);
168 struct acpi_eject_event
*ej_event
;
170 if ((!count
) || (buf
[0] != '1')) {
174 if (acpi_device
->driver
== NULL
) {
179 status
= acpi_get_type(acpi_device
->handle
, &type
);
180 if (ACPI_FAILURE(status
) || (!acpi_device
->flags
.ejectable
)) {
185 ej_event
= kmalloc(sizeof(*ej_event
), GFP_KERNEL
);
191 ej_event
->handle
= acpi_device
->handle
;
192 if (acpi_device
->flags
.eject_pending
) {
193 /* event originated from ACPI eject notification */
194 ej_event
->event
= ACPI_NOTIFY_EJECT_REQUEST
;
195 acpi_device
->flags
.eject_pending
= 0;
197 /* event originated from user */
198 ej_event
->event
= ACPI_OST_EC_OSPM_EJECT
;
199 (void) acpi_evaluate_hotplug_ost(ej_event
->handle
,
200 ej_event
->event
, ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
203 acpi_os_hotplug_execute(acpi_bus_hot_remove_device
, (void *)ej_event
);
208 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
211 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
212 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
214 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
216 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
219 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
220 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
221 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
224 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
228 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
233 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
235 static int acpi_device_setup_files(struct acpi_device
*dev
)
242 * Devices gotten from FADT don't have a "path" attribute
245 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
250 if (!list_empty(&dev
->pnp
.ids
)) {
251 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
255 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
261 * If device has _EJ0, 'eject' file is created that is used to trigger
262 * hot-removal function from userland.
264 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
265 if (ACPI_SUCCESS(status
))
266 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
271 static void acpi_device_remove_files(struct acpi_device
*dev
)
277 * If device has _EJ0, 'eject' file is created that is used to trigger
278 * hot-removal function from userland.
280 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
281 if (ACPI_SUCCESS(status
))
282 device_remove_file(&dev
->dev
, &dev_attr_eject
);
284 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
285 device_remove_file(&dev
->dev
, &dev_attr_hid
);
287 device_remove_file(&dev
->dev
, &dev_attr_path
);
289 /* --------------------------------------------------------------------------
291 -------------------------------------------------------------------------- */
293 int acpi_match_device_ids(struct acpi_device
*device
,
294 const struct acpi_device_id
*ids
)
296 const struct acpi_device_id
*id
;
297 struct acpi_hardware_id
*hwid
;
300 * If the device is not present, it is unnecessary to load device
303 if (!device
->status
.present
)
306 for (id
= ids
; id
->id
[0]; id
++)
307 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
308 if (!strcmp((char *) id
->id
, hwid
->id
))
313 EXPORT_SYMBOL(acpi_match_device_ids
);
315 static void acpi_free_ids(struct acpi_device
*device
)
317 struct acpi_hardware_id
*id
, *tmp
;
319 list_for_each_entry_safe(id
, tmp
, &device
->pnp
.ids
, list
) {
325 static void acpi_device_release(struct device
*dev
)
327 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
329 acpi_free_ids(acpi_dev
);
333 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
335 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
336 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
338 return !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
341 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
343 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
346 if (list_empty(&acpi_dev
->pnp
.ids
))
349 if (add_uevent_var(env
, "MODALIAS="))
351 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
352 sizeof(env
->buf
) - env
->buflen
);
353 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
359 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
361 struct acpi_device
*device
= data
;
363 device
->driver
->ops
.notify(device
, event
);
366 static acpi_status
acpi_device_notify_fixed(void *data
)
368 struct acpi_device
*device
= data
;
370 /* Fixed hardware devices have no handles */
371 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
375 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
379 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
381 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
382 acpi_device_notify_fixed
,
384 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
386 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
387 acpi_device_notify_fixed
,
390 status
= acpi_install_notify_handler(device
->handle
,
395 if (ACPI_FAILURE(status
))
400 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
402 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
403 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
404 acpi_device_notify_fixed
);
405 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
406 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
407 acpi_device_notify_fixed
);
409 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
413 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
414 static int acpi_start_single_object(struct acpi_device
*);
415 static int acpi_device_probe(struct device
* dev
)
417 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
418 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
421 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
423 if (acpi_dev
->bus_ops
.acpi_op_start
)
424 acpi_start_single_object(acpi_dev
);
426 if (acpi_drv
->ops
.notify
) {
427 ret
= acpi_device_install_notify_handler(acpi_dev
);
429 if (acpi_drv
->ops
.remove
)
430 acpi_drv
->ops
.remove(acpi_dev
,
431 acpi_dev
->removal_type
);
436 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
437 "Found driver [%s] for device [%s]\n",
438 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
444 static int acpi_device_remove(struct device
* dev
)
446 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
447 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
450 if (acpi_drv
->ops
.notify
)
451 acpi_device_remove_notify_handler(acpi_dev
);
452 if (acpi_drv
->ops
.remove
)
453 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
455 acpi_dev
->driver
= NULL
;
456 acpi_dev
->driver_data
= NULL
;
462 struct bus_type acpi_bus_type
= {
464 .match
= acpi_bus_match
,
465 .probe
= acpi_device_probe
,
466 .remove
= acpi_device_remove
,
467 .uevent
= acpi_device_uevent
,
470 static int acpi_device_register(struct acpi_device
*device
)
473 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
479 * Link this device to its parent and siblings.
481 INIT_LIST_HEAD(&device
->children
);
482 INIT_LIST_HEAD(&device
->node
);
483 INIT_LIST_HEAD(&device
->wakeup_list
);
485 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
487 printk(KERN_ERR PREFIX
"Memory allocation error\n");
491 mutex_lock(&acpi_device_lock
);
493 * Find suitable bus_id and instance number in acpi_bus_id_list
494 * If failed, create one and link it into acpi_bus_id_list
496 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
497 if (!strcmp(acpi_device_bus_id
->bus_id
,
498 acpi_device_hid(device
))) {
499 acpi_device_bus_id
->instance_no
++;
506 acpi_device_bus_id
= new_bus_id
;
507 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
508 acpi_device_bus_id
->instance_no
= 0;
509 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
511 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
514 list_add_tail(&device
->node
, &device
->parent
->children
);
516 if (device
->wakeup
.flags
.valid
)
517 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
518 mutex_unlock(&acpi_device_lock
);
521 device
->dev
.parent
= &device
->parent
->dev
;
522 device
->dev
.bus
= &acpi_bus_type
;
523 device
->dev
.release
= &acpi_device_release
;
524 result
= device_register(&device
->dev
);
526 dev_err(&device
->dev
, "Error registering device\n");
530 result
= acpi_device_setup_files(device
);
532 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
533 dev_name(&device
->dev
));
535 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
538 mutex_lock(&acpi_device_lock
);
540 list_del(&device
->node
);
541 list_del(&device
->wakeup_list
);
542 mutex_unlock(&acpi_device_lock
);
546 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
548 mutex_lock(&acpi_device_lock
);
550 list_del(&device
->node
);
552 list_del(&device
->wakeup_list
);
553 mutex_unlock(&acpi_device_lock
);
555 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
557 acpi_device_remove_files(device
);
558 device_unregister(&device
->dev
);
561 /* --------------------------------------------------------------------------
563 -------------------------------------------------------------------------- */
565 * acpi_bus_driver_init - add a device to a driver
566 * @device: the device to add and initialize
567 * @driver: driver for the device
569 * Used to initialize a device via its device driver. Called whenever a
570 * driver is bound to a device. Invokes the driver's add() ops.
573 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
577 if (!device
|| !driver
)
580 if (!driver
->ops
.add
)
583 result
= driver
->ops
.add(device
);
585 device
->driver
= NULL
;
586 device
->driver_data
= NULL
;
590 device
->driver
= driver
;
593 * TBD - Configuration Management: Assign resources to device based
594 * upon possible configuration and currently allocated resources.
597 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
598 "Driver successfully bound to device\n"));
602 static int acpi_start_single_object(struct acpi_device
*device
)
605 struct acpi_driver
*driver
;
608 if (!(driver
= device
->driver
))
611 if (driver
->ops
.start
) {
612 result
= driver
->ops
.start(device
);
613 if (result
&& driver
->ops
.remove
)
614 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
621 * acpi_bus_register_driver - register a driver with the ACPI bus
622 * @driver: driver being registered
624 * Registers a driver with the ACPI bus. Searches the namespace for all
625 * devices that match the driver's criteria and binds. Returns zero for
626 * success or a negative error status for failure.
628 int acpi_bus_register_driver(struct acpi_driver
*driver
)
634 driver
->drv
.name
= driver
->name
;
635 driver
->drv
.bus
= &acpi_bus_type
;
636 driver
->drv
.owner
= driver
->owner
;
638 ret
= driver_register(&driver
->drv
);
642 EXPORT_SYMBOL(acpi_bus_register_driver
);
645 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
646 * @driver: driver to unregister
648 * Unregisters a driver with the ACPI bus. Searches the namespace for all
649 * devices that match the driver's criteria and unbinds.
651 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
653 driver_unregister(&driver
->drv
);
656 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
658 /* --------------------------------------------------------------------------
660 -------------------------------------------------------------------------- */
661 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
665 struct acpi_device
*device
;
668 * Fixed hardware devices do not appear in the namespace and do not
669 * have handles, but we fabricate acpi_devices for them, so we have
670 * to deal with them specially.
676 status
= acpi_get_parent(handle
, &handle
);
677 if (status
== AE_NULL_ENTRY
)
679 if (ACPI_FAILURE(status
))
682 ret
= acpi_bus_get_device(handle
, &device
);
689 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
693 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
694 union acpi_object
*obj
;
696 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
697 if (ACPI_FAILURE(status
))
700 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
701 if (ACPI_SUCCESS(status
)) {
702 obj
= buffer
.pointer
;
703 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
705 kfree(buffer
.pointer
);
709 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
711 void acpi_bus_data_handler(acpi_handle handle
, void *context
)
719 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
721 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
726 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
727 struct acpi_device_wakeup
*wakeup
)
729 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
730 union acpi_object
*package
= NULL
;
731 union acpi_object
*element
= NULL
;
736 return AE_BAD_PARAMETER
;
739 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
740 if (ACPI_FAILURE(status
)) {
741 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
745 package
= (union acpi_object
*)buffer
.pointer
;
747 if (!package
|| (package
->package
.count
< 2)) {
748 status
= AE_BAD_DATA
;
752 element
= &(package
->package
.elements
[0]);
754 status
= AE_BAD_DATA
;
757 if (element
->type
== ACPI_TYPE_PACKAGE
) {
758 if ((element
->package
.count
< 2) ||
759 (element
->package
.elements
[0].type
!=
760 ACPI_TYPE_LOCAL_REFERENCE
)
761 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
)) {
762 status
= AE_BAD_DATA
;
766 element
->package
.elements
[0].reference
.handle
;
768 (u32
) element
->package
.elements
[1].integer
.value
;
769 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
770 wakeup
->gpe_device
= NULL
;
771 wakeup
->gpe_number
= element
->integer
.value
;
773 status
= AE_BAD_DATA
;
777 element
= &(package
->package
.elements
[1]);
778 if (element
->type
!= ACPI_TYPE_INTEGER
) {
779 status
= AE_BAD_DATA
;
782 wakeup
->sleep_state
= element
->integer
.value
;
784 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
785 status
= AE_NO_MEMORY
;
788 wakeup
->resources
.count
= package
->package
.count
- 2;
789 for (i
= 0; i
< wakeup
->resources
.count
; i
++) {
790 element
= &(package
->package
.elements
[i
+ 2]);
791 if (element
->type
!= ACPI_TYPE_LOCAL_REFERENCE
) {
792 status
= AE_BAD_DATA
;
796 wakeup
->resources
.handles
[i
] = element
->reference
.handle
;
799 acpi_setup_gpe_for_wake(handle
, wakeup
->gpe_device
, wakeup
->gpe_number
);
802 kfree(buffer
.pointer
);
807 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
809 struct acpi_device_id button_device_ids
[] = {
816 acpi_event_status event_status
;
818 device
->wakeup
.flags
.notifier_present
= 0;
820 /* Power button, Lid switch always enable wakeup */
821 if (!acpi_match_device_ids(device
, button_device_ids
)) {
822 device
->wakeup
.flags
.run_wake
= 1;
823 device_set_wakeup_capable(&device
->dev
, true);
827 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
828 device
->wakeup
.gpe_number
,
831 device
->wakeup
.flags
.run_wake
=
832 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
835 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
838 acpi_status status
= 0;
841 /* Presence of _PRW indicates wake capable */
842 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
843 if (ACPI_FAILURE(status
))
846 status
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
848 if (ACPI_FAILURE(status
)) {
849 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
853 device
->wakeup
.flags
.valid
= 1;
854 device
->wakeup
.prepare_count
= 0;
855 acpi_bus_set_run_wake_flags(device
);
856 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
857 * system for the ACPI device with the _PRW object.
858 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
859 * So it is necessary to call _DSW object first. Only when it is not
860 * present will the _PSW object used.
862 psw_error
= acpi_device_sleep_wake(device
, 0, 0, 0);
864 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
865 "error in _DSW or _PSW evaluation\n"));
868 static void acpi_bus_add_power_resource(acpi_handle handle
);
870 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
872 acpi_status status
= 0;
873 acpi_handle handle
= NULL
;
878 * Power Management Flags
880 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
881 if (ACPI_SUCCESS(status
))
882 device
->power
.flags
.explicit_get
= 1;
883 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
884 if (ACPI_SUCCESS(status
))
885 device
->power
.flags
.inrush_current
= 1;
888 * Enumerate supported power management states
890 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
891 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
892 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
894 /* Evaluate "_PRx" to se if power resources are referenced */
895 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
897 if (ps
->resources
.count
) {
900 device
->power
.flags
.power_resources
= 1;
901 for (j
= 0; j
< ps
->resources
.count
; j
++)
902 acpi_bus_add_power_resource(ps
->resources
.handles
[j
]);
905 /* Evaluate "_PSx" to see if we can do explicit sets */
906 object_name
[2] = 'S';
907 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
908 if (ACPI_SUCCESS(status
))
909 ps
->flags
.explicit_set
= 1;
912 * State is valid if there are means to put the device into it.
913 * D3hot is only valid if _PR3 present.
915 if (ps
->resources
.count
||
916 (ps
->flags
.explicit_set
&& i
< ACPI_STATE_D3_HOT
))
919 ps
->power
= -1; /* Unknown - driver assigned */
920 ps
->latency
= -1; /* Unknown - driver assigned */
923 /* Set defaults for D0 and D3 states (always valid) */
924 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
925 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
926 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
927 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
929 /* Set D3cold's explicit_set flag if _PS3 exists. */
930 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
931 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
933 acpi_bus_init_power(device
);
938 static int acpi_bus_get_flags(struct acpi_device
*device
)
940 acpi_status status
= AE_OK
;
941 acpi_handle temp
= NULL
;
944 /* Presence of _STA indicates 'dynamic_status' */
945 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
946 if (ACPI_SUCCESS(status
))
947 device
->flags
.dynamic_status
= 1;
949 /* Presence of _RMV indicates 'removable' */
950 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
951 if (ACPI_SUCCESS(status
))
952 device
->flags
.removable
= 1;
954 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
955 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
956 if (ACPI_SUCCESS(status
))
957 device
->flags
.ejectable
= 1;
959 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
960 if (ACPI_SUCCESS(status
))
961 device
->flags
.ejectable
= 1;
964 /* Presence of _LCK indicates 'lockable' */
965 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
966 if (ACPI_SUCCESS(status
))
967 device
->flags
.lockable
= 1;
969 /* Power resources cannot be power manageable. */
970 if (device
->device_type
== ACPI_BUS_TYPE_POWER
)
973 /* Presence of _PS0|_PR0 indicates 'power manageable' */
974 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
975 if (ACPI_FAILURE(status
))
976 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
977 if (ACPI_SUCCESS(status
))
978 device
->flags
.power_manageable
= 1;
980 /* TBD: Performance management */
985 static void acpi_device_get_busid(struct acpi_device
*device
)
987 char bus_id
[5] = { '?', 0 };
988 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
994 * The device's Bus ID is simply the object name.
995 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
997 if (ACPI_IS_ROOT_DEVICE(device
)) {
998 strcpy(device
->pnp
.bus_id
, "ACPI");
1002 switch (device
->device_type
) {
1003 case ACPI_BUS_TYPE_POWER_BUTTON
:
1004 strcpy(device
->pnp
.bus_id
, "PWRF");
1006 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1007 strcpy(device
->pnp
.bus_id
, "SLPF");
1010 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1011 /* Clean up trailing underscores (if any) */
1012 for (i
= 3; i
> 1; i
--) {
1013 if (bus_id
[i
] == '_')
1018 strcpy(device
->pnp
.bus_id
, bus_id
);
1024 * acpi_bay_match - see if a device is an ejectable driver bay
1026 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1027 * then we can safely call it an ejectable drive bay
1029 static int acpi_bay_match(struct acpi_device
*device
){
1033 acpi_handle phandle
;
1035 handle
= device
->handle
;
1037 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
1038 if (ACPI_FAILURE(status
))
1041 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
1042 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
1043 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
1044 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
1047 if (acpi_get_parent(handle
, &phandle
))
1050 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
1051 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
1052 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
1053 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
1060 * acpi_dock_match - see if a device has a _DCK method
1062 static int acpi_dock_match(struct acpi_device
*device
)
1065 return acpi_get_handle(device
->handle
, "_DCK", &tmp
);
1068 const char *acpi_device_hid(struct acpi_device
*device
)
1070 struct acpi_hardware_id
*hid
;
1072 if (list_empty(&device
->pnp
.ids
))
1075 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1078 EXPORT_SYMBOL(acpi_device_hid
);
1080 static void acpi_add_id(struct acpi_device
*device
, const char *dev_id
)
1082 struct acpi_hardware_id
*id
;
1084 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1088 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1094 list_add_tail(&id
->list
, &device
->pnp
.ids
);
1098 * Old IBM workstations have a DSDT bug wherein the SMBus object
1099 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1100 * prefix. Work around this.
1102 static int acpi_ibm_smbus_match(struct acpi_device
*device
)
1104 acpi_handle h_dummy
;
1105 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1108 if (!dmi_name_in_vendors("IBM"))
1111 /* Look for SMBS object */
1112 result
= acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &path
);
1116 if (strcmp("SMBS", path
.pointer
)) {
1121 /* Does it have the necessary (but misnamed) methods? */
1123 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBI", &h_dummy
)) &&
1124 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBR", &h_dummy
)) &&
1125 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBW", &h_dummy
)))
1128 kfree(path
.pointer
);
1132 static void acpi_device_set_id(struct acpi_device
*device
)
1135 struct acpi_device_info
*info
;
1136 struct acpica_device_id_list
*cid_list
;
1139 switch (device
->device_type
) {
1140 case ACPI_BUS_TYPE_DEVICE
:
1141 if (ACPI_IS_ROOT_DEVICE(device
)) {
1142 acpi_add_id(device
, ACPI_SYSTEM_HID
);
1146 status
= acpi_get_object_info(device
->handle
, &info
);
1147 if (ACPI_FAILURE(status
)) {
1148 printk(KERN_ERR PREFIX
"%s: Error reading device info\n", __func__
);
1152 if (info
->valid
& ACPI_VALID_HID
)
1153 acpi_add_id(device
, info
->hardware_id
.string
);
1154 if (info
->valid
& ACPI_VALID_CID
) {
1155 cid_list
= &info
->compatible_id_list
;
1156 for (i
= 0; i
< cid_list
->count
; i
++)
1157 acpi_add_id(device
, cid_list
->ids
[i
].string
);
1159 if (info
->valid
& ACPI_VALID_ADR
) {
1160 device
->pnp
.bus_address
= info
->address
;
1161 device
->flags
.bus_address
= 1;
1167 * Some devices don't reliably have _HIDs & _CIDs, so add
1168 * synthetic HIDs to make sure drivers can find them.
1170 if (acpi_is_video_device(device
))
1171 acpi_add_id(device
, ACPI_VIDEO_HID
);
1172 else if (ACPI_SUCCESS(acpi_bay_match(device
)))
1173 acpi_add_id(device
, ACPI_BAY_HID
);
1174 else if (ACPI_SUCCESS(acpi_dock_match(device
)))
1175 acpi_add_id(device
, ACPI_DOCK_HID
);
1176 else if (!acpi_ibm_smbus_match(device
))
1177 acpi_add_id(device
, ACPI_SMBUS_IBM_HID
);
1178 else if (!acpi_device_hid(device
) &&
1179 ACPI_IS_ROOT_DEVICE(device
->parent
)) {
1180 acpi_add_id(device
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1181 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1182 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1186 case ACPI_BUS_TYPE_POWER
:
1187 acpi_add_id(device
, ACPI_POWER_HID
);
1189 case ACPI_BUS_TYPE_PROCESSOR
:
1190 acpi_add_id(device
, ACPI_PROCESSOR_OBJECT_HID
);
1192 case ACPI_BUS_TYPE_THERMAL
:
1193 acpi_add_id(device
, ACPI_THERMAL_HID
);
1195 case ACPI_BUS_TYPE_POWER_BUTTON
:
1196 acpi_add_id(device
, ACPI_BUTTON_HID_POWERF
);
1198 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1199 acpi_add_id(device
, ACPI_BUTTON_HID_SLEEPF
);
1204 static int acpi_device_set_context(struct acpi_device
*device
)
1211 * Attach this 'struct acpi_device' to the ACPI object. This makes
1212 * resolutions from handle->device very efficient. Fixed hardware
1213 * devices have no handles, so we skip them.
1215 if (!device
->handle
)
1218 status
= acpi_attach_data(device
->handle
,
1219 acpi_bus_data_handler
, device
);
1220 if (ACPI_SUCCESS(status
))
1223 printk(KERN_ERR PREFIX
"Error attaching device data\n");
1227 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
1232 dev
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1233 device_release_driver(&dev
->dev
);
1239 * unbind _ADR-Based Devices when hot removal
1241 if (dev
->flags
.bus_address
) {
1242 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
1243 dev
->parent
->ops
.unbind(dev
);
1245 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
1250 static int acpi_add_single_object(struct acpi_device
**child
,
1251 acpi_handle handle
, int type
,
1252 unsigned long long sta
,
1253 struct acpi_bus_ops
*ops
)
1256 struct acpi_device
*device
;
1257 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1259 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1261 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1265 INIT_LIST_HEAD(&device
->pnp
.ids
);
1266 device
->device_type
= type
;
1267 device
->handle
= handle
;
1268 device
->parent
= acpi_bus_get_parent(handle
);
1269 device
->bus_ops
= *ops
; /* workround for not call .start */
1270 STRUCT_TO_INT(device
->status
) = sta
;
1272 acpi_device_get_busid(device
);
1277 * Note that we only look for object handles -- cannot evaluate objects
1278 * until we know the device is present and properly initialized.
1280 result
= acpi_bus_get_flags(device
);
1287 * TBD: Synch with Core's enumeration/initialization process.
1289 acpi_device_set_id(device
);
1295 if (device
->flags
.power_manageable
) {
1296 result
= acpi_bus_get_power_flags(device
);
1302 * Wakeup device management
1303 *-----------------------
1305 acpi_bus_get_wakeup_device_flags(device
);
1308 * Performance Management
1309 * ----------------------
1311 if (device
->flags
.performance_manageable
) {
1312 result
= acpi_bus_get_perf_flags(device
);
1317 if ((result
= acpi_device_set_context(device
)))
1320 result
= acpi_device_register(device
);
1323 * Bind _ADR-Based Devices when hot add
1325 if (device
->flags
.bus_address
) {
1326 if (device
->parent
&& device
->parent
->ops
.bind
)
1327 device
->parent
->ops
.bind(device
);
1332 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1333 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1334 "Adding %s [%s] parent %s\n", dev_name(&device
->dev
),
1335 (char *) buffer
.pointer
,
1336 device
->parent
? dev_name(&device
->parent
->dev
) :
1338 kfree(buffer
.pointer
);
1341 acpi_device_release(&device
->dev
);
1346 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1347 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1349 static void acpi_bus_add_power_resource(acpi_handle handle
)
1351 struct acpi_bus_ops ops
= {
1355 struct acpi_device
*device
= NULL
;
1357 acpi_bus_get_device(handle
, &device
);
1359 acpi_add_single_object(&device
, handle
, ACPI_BUS_TYPE_POWER
,
1360 ACPI_STA_DEFAULT
, &ops
);
1363 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1364 unsigned long long *sta
)
1367 acpi_object_type acpi_type
;
1369 status
= acpi_get_type(handle
, &acpi_type
);
1370 if (ACPI_FAILURE(status
))
1373 switch (acpi_type
) {
1374 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1375 case ACPI_TYPE_DEVICE
:
1376 *type
= ACPI_BUS_TYPE_DEVICE
;
1377 status
= acpi_bus_get_status_handle(handle
, sta
);
1378 if (ACPI_FAILURE(status
))
1381 case ACPI_TYPE_PROCESSOR
:
1382 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1383 status
= acpi_bus_get_status_handle(handle
, sta
);
1384 if (ACPI_FAILURE(status
))
1387 case ACPI_TYPE_THERMAL
:
1388 *type
= ACPI_BUS_TYPE_THERMAL
;
1389 *sta
= ACPI_STA_DEFAULT
;
1391 case ACPI_TYPE_POWER
:
1392 *type
= ACPI_BUS_TYPE_POWER
;
1393 *sta
= ACPI_STA_DEFAULT
;
1402 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl
,
1403 void *context
, void **return_value
)
1405 struct acpi_bus_ops
*ops
= context
;
1407 unsigned long long sta
;
1408 struct acpi_device
*device
;
1412 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1416 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1417 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
)) {
1418 struct acpi_device_wakeup wakeup
;
1421 status
= acpi_get_handle(handle
, "_PRW", &temp
);
1422 if (ACPI_SUCCESS(status
))
1423 acpi_bus_extract_wakeup_device_power_package(handle
,
1425 return AE_CTRL_DEPTH
;
1429 * We may already have an acpi_device from a previous enumeration. If
1430 * so, we needn't add it again, but we may still have to start it.
1433 acpi_bus_get_device(handle
, &device
);
1434 if (ops
->acpi_op_add
&& !device
)
1435 acpi_add_single_object(&device
, handle
, type
, sta
, ops
);
1438 return AE_CTRL_DEPTH
;
1440 if (ops
->acpi_op_start
&& !(ops
->acpi_op_add
)) {
1441 status
= acpi_start_single_object(device
);
1442 if (ACPI_FAILURE(status
))
1443 return AE_CTRL_DEPTH
;
1447 *return_value
= device
;
1451 static int acpi_bus_scan(acpi_handle handle
, struct acpi_bus_ops
*ops
,
1452 struct acpi_device
**child
)
1455 void *device
= NULL
;
1457 status
= acpi_bus_check_add(handle
, 0, ops
, &device
);
1458 if (ACPI_SUCCESS(status
))
1459 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1460 acpi_bus_check_add
, NULL
, ops
, &device
);
1472 * acpi_bus_add and acpi_bus_start
1474 * scan a given ACPI tree and (probably recently hot-plugged)
1475 * create and add or starts found devices.
1477 * If no devices were found -ENODEV is returned which does not
1478 * mean that this is a real error, there just have been no suitable
1479 * ACPI objects in the table trunk from which the kernel could create
1480 * a device and add/start an appropriate driver.
1484 acpi_bus_add(struct acpi_device
**child
,
1485 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1487 struct acpi_bus_ops ops
;
1489 memset(&ops
, 0, sizeof(ops
));
1490 ops
.acpi_op_add
= 1;
1492 return acpi_bus_scan(handle
, &ops
, child
);
1494 EXPORT_SYMBOL(acpi_bus_add
);
1496 int acpi_bus_start(struct acpi_device
*device
)
1498 struct acpi_bus_ops ops
;
1504 memset(&ops
, 0, sizeof(ops
));
1505 ops
.acpi_op_start
= 1;
1507 result
= acpi_bus_scan(device
->handle
, &ops
, NULL
);
1509 acpi_update_all_gpes();
1513 EXPORT_SYMBOL(acpi_bus_start
);
1515 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1518 struct acpi_device
*parent
, *child
;
1519 acpi_handle phandle
, chandle
;
1520 acpi_object_type type
;
1525 phandle
= start
->handle
;
1526 child
= chandle
= NULL
;
1528 while ((level
> 0) && parent
&& (!err
)) {
1529 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1533 * If this scope is exhausted then move our way back up.
1535 if (ACPI_FAILURE(status
)) {
1538 acpi_get_parent(phandle
, &phandle
);
1540 parent
= parent
->parent
;
1543 err
= acpi_bus_remove(child
, rmdevice
);
1545 err
= acpi_bus_remove(child
, 1);
1550 status
= acpi_get_type(chandle
, &type
);
1551 if (ACPI_FAILURE(status
)) {
1555 * If there is a device corresponding to chandle then
1556 * parse it (depth-first).
1558 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1568 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1570 static int acpi_bus_scan_fixed(void)
1573 struct acpi_device
*device
= NULL
;
1574 struct acpi_bus_ops ops
;
1576 memset(&ops
, 0, sizeof(ops
));
1577 ops
.acpi_op_add
= 1;
1578 ops
.acpi_op_start
= 1;
1581 * Enumerate all fixed-feature devices.
1583 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1584 result
= acpi_add_single_object(&device
, NULL
,
1585 ACPI_BUS_TYPE_POWER_BUTTON
,
1588 device_init_wakeup(&device
->dev
, true);
1591 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1592 result
= acpi_add_single_object(&device
, NULL
,
1593 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1601 int __init
acpi_scan_init(void)
1604 struct acpi_bus_ops ops
;
1606 memset(&ops
, 0, sizeof(ops
));
1607 ops
.acpi_op_add
= 1;
1608 ops
.acpi_op_start
= 1;
1610 result
= bus_register(&acpi_bus_type
);
1612 /* We don't want to quit even if we failed to add suspend/resume */
1613 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1619 * Enumerate devices in the ACPI namespace.
1621 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
, &ops
, &acpi_root
);
1624 result
= acpi_bus_scan_fixed();
1627 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);
1629 acpi_update_all_gpes();