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
);
86 static void acpi_bus_hot_remove_device(void *context
)
88 struct acpi_device
*device
;
89 acpi_handle handle
= context
;
90 struct acpi_object_list arg_list
;
91 union acpi_object arg
;
92 acpi_status status
= AE_OK
;
94 if (acpi_bus_get_device(handle
, &device
))
100 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
101 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
103 if (acpi_bus_trim(device
, 1)) {
104 printk(KERN_ERR PREFIX
105 "Removing device failed\n");
109 /* power off device */
110 status
= acpi_evaluate_object(handle
, "_PS3", NULL
, NULL
);
111 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
)
112 printk(KERN_WARNING PREFIX
113 "Power-off device failed\n");
115 if (device
->flags
.lockable
) {
117 arg_list
.pointer
= &arg
;
118 arg
.type
= ACPI_TYPE_INTEGER
;
119 arg
.integer
.value
= 0;
120 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
124 arg_list
.pointer
= &arg
;
125 arg
.type
= ACPI_TYPE_INTEGER
;
126 arg
.integer
.value
= 1;
131 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
132 if (ACPI_FAILURE(status
))
133 printk(KERN_WARNING PREFIX
134 "Eject device failed\n");
140 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
141 const char *buf
, size_t count
)
145 acpi_object_type type
= 0;
146 struct acpi_device
*acpi_device
= to_acpi_device(d
);
148 if ((!count
) || (buf
[0] != '1')) {
152 if (acpi_device
->driver
== NULL
) {
157 status
= acpi_get_type(acpi_device
->handle
, &type
);
158 if (ACPI_FAILURE(status
) || (!acpi_device
->flags
.ejectable
)) {
163 acpi_os_hotplug_execute(acpi_bus_hot_remove_device
, acpi_device
->handle
);
168 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
171 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
172 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
174 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
176 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
179 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
180 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
181 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
184 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
188 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
193 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
195 static int acpi_device_setup_files(struct acpi_device
*dev
)
202 * Devices gotten from FADT don't have a "path" attribute
205 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
210 if (!list_empty(&dev
->pnp
.ids
)) {
211 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
215 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
221 * If device has _EJ0, 'eject' file is created that is used to trigger
222 * hot-removal function from userland.
224 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
225 if (ACPI_SUCCESS(status
))
226 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
231 static void acpi_device_remove_files(struct acpi_device
*dev
)
237 * If device has _EJ0, 'eject' file is created that is used to trigger
238 * hot-removal function from userland.
240 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
241 if (ACPI_SUCCESS(status
))
242 device_remove_file(&dev
->dev
, &dev_attr_eject
);
244 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
245 device_remove_file(&dev
->dev
, &dev_attr_hid
);
247 device_remove_file(&dev
->dev
, &dev_attr_path
);
249 /* --------------------------------------------------------------------------
251 -------------------------------------------------------------------------- */
253 int acpi_match_device_ids(struct acpi_device
*device
,
254 const struct acpi_device_id
*ids
)
256 const struct acpi_device_id
*id
;
257 struct acpi_hardware_id
*hwid
;
260 * If the device is not present, it is unnecessary to load device
263 if (!device
->status
.present
)
266 for (id
= ids
; id
->id
[0]; id
++)
267 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
268 if (!strcmp((char *) id
->id
, hwid
->id
))
273 EXPORT_SYMBOL(acpi_match_device_ids
);
275 static void acpi_free_ids(struct acpi_device
*device
)
277 struct acpi_hardware_id
*id
, *tmp
;
279 list_for_each_entry_safe(id
, tmp
, &device
->pnp
.ids
, list
) {
285 static void acpi_device_release(struct device
*dev
)
287 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
289 acpi_free_ids(acpi_dev
);
293 static int acpi_device_suspend(struct device
*dev
, pm_message_t state
)
295 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
296 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
298 if (acpi_drv
&& acpi_drv
->ops
.suspend
)
299 return acpi_drv
->ops
.suspend(acpi_dev
, state
);
303 static int acpi_device_resume(struct device
*dev
)
305 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
306 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
308 if (acpi_drv
&& acpi_drv
->ops
.resume
)
309 return acpi_drv
->ops
.resume(acpi_dev
);
313 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
315 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
316 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
318 return !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
321 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
323 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
326 if (list_empty(&acpi_dev
->pnp
.ids
))
329 if (add_uevent_var(env
, "MODALIAS="))
331 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
332 sizeof(env
->buf
) - env
->buflen
);
333 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
339 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
341 struct acpi_device
*device
= data
;
343 device
->driver
->ops
.notify(device
, event
);
346 static acpi_status
acpi_device_notify_fixed(void *data
)
348 struct acpi_device
*device
= data
;
350 /* Fixed hardware devices have no handles */
351 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
355 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
359 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
361 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
362 acpi_device_notify_fixed
,
364 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
366 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
367 acpi_device_notify_fixed
,
370 status
= acpi_install_notify_handler(device
->handle
,
375 if (ACPI_FAILURE(status
))
380 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
382 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
383 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
384 acpi_device_notify_fixed
);
385 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
386 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
387 acpi_device_notify_fixed
);
389 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
393 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
394 static int acpi_start_single_object(struct acpi_device
*);
395 static int acpi_device_probe(struct device
* dev
)
397 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
398 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
401 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
403 if (acpi_dev
->bus_ops
.acpi_op_start
)
404 acpi_start_single_object(acpi_dev
);
406 if (acpi_drv
->ops
.notify
) {
407 ret
= acpi_device_install_notify_handler(acpi_dev
);
409 if (acpi_drv
->ops
.remove
)
410 acpi_drv
->ops
.remove(acpi_dev
,
411 acpi_dev
->removal_type
);
416 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
417 "Found driver [%s] for device [%s]\n",
418 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
424 static int acpi_device_remove(struct device
* dev
)
426 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
427 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
430 if (acpi_drv
->ops
.notify
)
431 acpi_device_remove_notify_handler(acpi_dev
);
432 if (acpi_drv
->ops
.remove
)
433 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
435 acpi_dev
->driver
= NULL
;
436 acpi_dev
->driver_data
= NULL
;
442 struct bus_type acpi_bus_type
= {
444 .suspend
= acpi_device_suspend
,
445 .resume
= acpi_device_resume
,
446 .match
= acpi_bus_match
,
447 .probe
= acpi_device_probe
,
448 .remove
= acpi_device_remove
,
449 .uevent
= acpi_device_uevent
,
452 static int acpi_device_register(struct acpi_device
*device
)
455 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
461 * Link this device to its parent and siblings.
463 INIT_LIST_HEAD(&device
->children
);
464 INIT_LIST_HEAD(&device
->node
);
465 INIT_LIST_HEAD(&device
->wakeup_list
);
467 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
469 printk(KERN_ERR PREFIX
"Memory allocation error\n");
473 mutex_lock(&acpi_device_lock
);
475 * Find suitable bus_id and instance number in acpi_bus_id_list
476 * If failed, create one and link it into acpi_bus_id_list
478 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
479 if (!strcmp(acpi_device_bus_id
->bus_id
,
480 acpi_device_hid(device
))) {
481 acpi_device_bus_id
->instance_no
++;
488 acpi_device_bus_id
= new_bus_id
;
489 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
490 acpi_device_bus_id
->instance_no
= 0;
491 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
493 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
496 list_add_tail(&device
->node
, &device
->parent
->children
);
498 if (device
->wakeup
.flags
.valid
)
499 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
500 mutex_unlock(&acpi_device_lock
);
503 device
->dev
.parent
= &device
->parent
->dev
;
504 device
->dev
.bus
= &acpi_bus_type
;
505 device
->dev
.release
= &acpi_device_release
;
506 result
= device_register(&device
->dev
);
508 dev_err(&device
->dev
, "Error registering device\n");
512 result
= acpi_device_setup_files(device
);
514 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
515 dev_name(&device
->dev
));
517 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
520 mutex_lock(&acpi_device_lock
);
522 list_del(&device
->node
);
523 list_del(&device
->wakeup_list
);
524 mutex_unlock(&acpi_device_lock
);
528 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
530 mutex_lock(&acpi_device_lock
);
532 list_del(&device
->node
);
534 list_del(&device
->wakeup_list
);
535 mutex_unlock(&acpi_device_lock
);
537 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
539 acpi_device_remove_files(device
);
540 device_unregister(&device
->dev
);
543 /* --------------------------------------------------------------------------
545 -------------------------------------------------------------------------- */
547 * acpi_bus_driver_init - add a device to a driver
548 * @device: the device to add and initialize
549 * @driver: driver for the device
551 * Used to initialize a device via its device driver. Called whenever a
552 * driver is bound to a device. Invokes the driver's add() ops.
555 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
559 if (!device
|| !driver
)
562 if (!driver
->ops
.add
)
565 result
= driver
->ops
.add(device
);
567 device
->driver
= NULL
;
568 device
->driver_data
= NULL
;
572 device
->driver
= driver
;
575 * TBD - Configuration Management: Assign resources to device based
576 * upon possible configuration and currently allocated resources.
579 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
580 "Driver successfully bound to device\n"));
584 static int acpi_start_single_object(struct acpi_device
*device
)
587 struct acpi_driver
*driver
;
590 if (!(driver
= device
->driver
))
593 if (driver
->ops
.start
) {
594 result
= driver
->ops
.start(device
);
595 if (result
&& driver
->ops
.remove
)
596 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
603 * acpi_bus_register_driver - register a driver with the ACPI bus
604 * @driver: driver being registered
606 * Registers a driver with the ACPI bus. Searches the namespace for all
607 * devices that match the driver's criteria and binds. Returns zero for
608 * success or a negative error status for failure.
610 int acpi_bus_register_driver(struct acpi_driver
*driver
)
616 driver
->drv
.name
= driver
->name
;
617 driver
->drv
.bus
= &acpi_bus_type
;
618 driver
->drv
.owner
= driver
->owner
;
620 ret
= driver_register(&driver
->drv
);
624 EXPORT_SYMBOL(acpi_bus_register_driver
);
627 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
628 * @driver: driver to unregister
630 * Unregisters a driver with the ACPI bus. Searches the namespace for all
631 * devices that match the driver's criteria and unbinds.
633 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
635 driver_unregister(&driver
->drv
);
638 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
640 /* --------------------------------------------------------------------------
642 -------------------------------------------------------------------------- */
643 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
647 struct acpi_device
*device
;
650 * Fixed hardware devices do not appear in the namespace and do not
651 * have handles, but we fabricate acpi_devices for them, so we have
652 * to deal with them specially.
658 status
= acpi_get_parent(handle
, &handle
);
659 if (status
== AE_NULL_ENTRY
)
661 if (ACPI_FAILURE(status
))
664 ret
= acpi_bus_get_device(handle
, &device
);
671 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
675 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
676 union acpi_object
*obj
;
678 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
679 if (ACPI_FAILURE(status
))
682 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
683 if (ACPI_SUCCESS(status
)) {
684 obj
= buffer
.pointer
;
685 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
687 kfree(buffer
.pointer
);
691 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
693 void acpi_bus_data_handler(acpi_handle handle
, void *context
)
701 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
703 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
708 acpi_bus_extract_wakeup_device_power_package(struct acpi_device
*device
,
709 union acpi_object
*package
)
712 union acpi_object
*element
= NULL
;
714 if (!device
|| !package
|| (package
->package
.count
< 2))
715 return AE_BAD_PARAMETER
;
717 element
= &(package
->package
.elements
[0]);
719 return AE_BAD_PARAMETER
;
720 if (element
->type
== ACPI_TYPE_PACKAGE
) {
721 if ((element
->package
.count
< 2) ||
722 (element
->package
.elements
[0].type
!=
723 ACPI_TYPE_LOCAL_REFERENCE
)
724 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
726 device
->wakeup
.gpe_device
=
727 element
->package
.elements
[0].reference
.handle
;
728 device
->wakeup
.gpe_number
=
729 (u32
) element
->package
.elements
[1].integer
.value
;
730 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
731 device
->wakeup
.gpe_number
= element
->integer
.value
;
735 element
= &(package
->package
.elements
[1]);
736 if (element
->type
!= ACPI_TYPE_INTEGER
) {
739 device
->wakeup
.sleep_state
= element
->integer
.value
;
741 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
744 device
->wakeup
.resources
.count
= package
->package
.count
- 2;
745 for (i
= 0; i
< device
->wakeup
.resources
.count
; i
++) {
746 element
= &(package
->package
.elements
[i
+ 2]);
747 if (element
->type
!= ACPI_TYPE_LOCAL_REFERENCE
)
750 device
->wakeup
.resources
.handles
[i
] = element
->reference
.handle
;
753 acpi_gpe_can_wake(device
->wakeup
.gpe_device
, device
->wakeup
.gpe_number
);
758 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
760 struct acpi_device_id button_device_ids
[] = {
767 acpi_event_status event_status
;
769 device
->wakeup
.run_wake_count
= 0;
770 device
->wakeup
.flags
.notifier_present
= 0;
772 /* Power button, Lid switch always enable wakeup */
773 if (!acpi_match_device_ids(device
, button_device_ids
)) {
774 device
->wakeup
.flags
.run_wake
= 1;
775 device
->wakeup
.flags
.always_enabled
= 1;
779 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
780 device
->wakeup
.gpe_number
,
783 device
->wakeup
.flags
.run_wake
=
784 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
787 static int acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
789 acpi_status status
= 0;
790 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
791 union acpi_object
*package
= NULL
;
795 status
= acpi_evaluate_object(device
->handle
, "_PRW", NULL
, &buffer
);
796 if (ACPI_FAILURE(status
)) {
797 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
801 package
= (union acpi_object
*)buffer
.pointer
;
802 status
= acpi_bus_extract_wakeup_device_power_package(device
, package
);
803 if (ACPI_FAILURE(status
)) {
804 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
808 kfree(buffer
.pointer
);
810 device
->wakeup
.flags
.valid
= 1;
811 device
->wakeup
.prepare_count
= 0;
812 acpi_bus_set_run_wake_flags(device
);
813 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
814 * system for the ACPI device with the _PRW object.
815 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
816 * So it is necessary to call _DSW object first. Only when it is not
817 * present will the _PSW object used.
819 psw_error
= acpi_device_sleep_wake(device
, 0, 0, 0);
821 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
822 "error in _DSW or _PSW evaluation\n"));
825 if (ACPI_FAILURE(status
))
826 device
->flags
.wake_capable
= 0;
830 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
832 acpi_status status
= 0;
833 acpi_handle handle
= NULL
;
838 * Power Management Flags
840 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
841 if (ACPI_SUCCESS(status
))
842 device
->power
.flags
.explicit_get
= 1;
843 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
844 if (ACPI_SUCCESS(status
))
845 device
->power
.flags
.inrush_current
= 1;
848 * Enumerate supported power management states
850 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3
; i
++) {
851 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
852 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
854 /* Evaluate "_PRx" to se if power resources are referenced */
855 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
857 if (ps
->resources
.count
) {
858 device
->power
.flags
.power_resources
= 1;
862 /* Evaluate "_PSx" to see if we can do explicit sets */
863 object_name
[2] = 'S';
864 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
865 if (ACPI_SUCCESS(status
)) {
866 ps
->flags
.explicit_set
= 1;
870 /* State is valid if we have some power control */
871 if (ps
->resources
.count
|| ps
->flags
.explicit_set
)
874 ps
->power
= -1; /* Unknown - driver assigned */
875 ps
->latency
= -1; /* Unknown - driver assigned */
878 /* Set defaults for D0 and D3 states (always valid) */
879 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
880 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
881 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
882 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
884 /* TBD: System wake support and resource requirements. */
886 device
->power
.state
= ACPI_STATE_UNKNOWN
;
887 acpi_bus_get_power(device
->handle
, &(device
->power
.state
));
892 static int acpi_bus_get_flags(struct acpi_device
*device
)
894 acpi_status status
= AE_OK
;
895 acpi_handle temp
= NULL
;
898 /* Presence of _STA indicates 'dynamic_status' */
899 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
900 if (ACPI_SUCCESS(status
))
901 device
->flags
.dynamic_status
= 1;
903 /* Presence of _RMV indicates 'removable' */
904 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
905 if (ACPI_SUCCESS(status
))
906 device
->flags
.removable
= 1;
908 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
909 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
910 if (ACPI_SUCCESS(status
))
911 device
->flags
.ejectable
= 1;
913 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
914 if (ACPI_SUCCESS(status
))
915 device
->flags
.ejectable
= 1;
918 /* Presence of _LCK indicates 'lockable' */
919 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
920 if (ACPI_SUCCESS(status
))
921 device
->flags
.lockable
= 1;
923 /* Presence of _PS0|_PR0 indicates 'power manageable' */
924 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
925 if (ACPI_FAILURE(status
))
926 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
927 if (ACPI_SUCCESS(status
))
928 device
->flags
.power_manageable
= 1;
930 /* Presence of _PRW indicates wake capable */
931 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
932 if (ACPI_SUCCESS(status
))
933 device
->flags
.wake_capable
= 1;
935 /* TBD: Performance management */
940 static void acpi_device_get_busid(struct acpi_device
*device
)
942 char bus_id
[5] = { '?', 0 };
943 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
949 * The device's Bus ID is simply the object name.
950 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
952 if (ACPI_IS_ROOT_DEVICE(device
)) {
953 strcpy(device
->pnp
.bus_id
, "ACPI");
957 switch (device
->device_type
) {
958 case ACPI_BUS_TYPE_POWER_BUTTON
:
959 strcpy(device
->pnp
.bus_id
, "PWRF");
961 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
962 strcpy(device
->pnp
.bus_id
, "SLPF");
965 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
966 /* Clean up trailing underscores (if any) */
967 for (i
= 3; i
> 1; i
--) {
968 if (bus_id
[i
] == '_')
973 strcpy(device
->pnp
.bus_id
, bus_id
);
979 * acpi_bay_match - see if a device is an ejectable driver bay
981 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
982 * then we can safely call it an ejectable drive bay
984 static int acpi_bay_match(struct acpi_device
*device
){
990 handle
= device
->handle
;
992 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
993 if (ACPI_FAILURE(status
))
996 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
997 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
998 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
999 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
1002 if (acpi_get_parent(handle
, &phandle
))
1005 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
1006 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
1007 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
1008 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
1015 * acpi_dock_match - see if a device has a _DCK method
1017 static int acpi_dock_match(struct acpi_device
*device
)
1020 return acpi_get_handle(device
->handle
, "_DCK", &tmp
);
1023 const char *acpi_device_hid(struct acpi_device
*device
)
1025 struct acpi_hardware_id
*hid
;
1027 if (list_empty(&device
->pnp
.ids
))
1030 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1033 EXPORT_SYMBOL(acpi_device_hid
);
1035 static void acpi_add_id(struct acpi_device
*device
, const char *dev_id
)
1037 struct acpi_hardware_id
*id
;
1039 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1043 id
->id
= kmalloc(strlen(dev_id
) + 1, GFP_KERNEL
);
1049 strcpy(id
->id
, dev_id
);
1050 list_add_tail(&id
->list
, &device
->pnp
.ids
);
1054 * Old IBM workstations have a DSDT bug wherein the SMBus object
1055 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1056 * prefix. Work around this.
1058 static int acpi_ibm_smbus_match(struct acpi_device
*device
)
1060 acpi_handle h_dummy
;
1061 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1064 if (!dmi_name_in_vendors("IBM"))
1067 /* Look for SMBS object */
1068 result
= acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &path
);
1072 if (strcmp("SMBS", path
.pointer
)) {
1077 /* Does it have the necessary (but misnamed) methods? */
1079 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBI", &h_dummy
)) &&
1080 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBR", &h_dummy
)) &&
1081 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBW", &h_dummy
)))
1084 kfree(path
.pointer
);
1088 static void acpi_device_set_id(struct acpi_device
*device
)
1091 struct acpi_device_info
*info
;
1092 struct acpica_device_id_list
*cid_list
;
1095 switch (device
->device_type
) {
1096 case ACPI_BUS_TYPE_DEVICE
:
1097 if (ACPI_IS_ROOT_DEVICE(device
)) {
1098 acpi_add_id(device
, ACPI_SYSTEM_HID
);
1102 status
= acpi_get_object_info(device
->handle
, &info
);
1103 if (ACPI_FAILURE(status
)) {
1104 printk(KERN_ERR PREFIX
"%s: Error reading device info\n", __func__
);
1108 if (info
->valid
& ACPI_VALID_HID
)
1109 acpi_add_id(device
, info
->hardware_id
.string
);
1110 if (info
->valid
& ACPI_VALID_CID
) {
1111 cid_list
= &info
->compatible_id_list
;
1112 for (i
= 0; i
< cid_list
->count
; i
++)
1113 acpi_add_id(device
, cid_list
->ids
[i
].string
);
1115 if (info
->valid
& ACPI_VALID_ADR
) {
1116 device
->pnp
.bus_address
= info
->address
;
1117 device
->flags
.bus_address
= 1;
1123 * Some devices don't reliably have _HIDs & _CIDs, so add
1124 * synthetic HIDs to make sure drivers can find them.
1126 if (acpi_is_video_device(device
))
1127 acpi_add_id(device
, ACPI_VIDEO_HID
);
1128 else if (ACPI_SUCCESS(acpi_bay_match(device
)))
1129 acpi_add_id(device
, ACPI_BAY_HID
);
1130 else if (ACPI_SUCCESS(acpi_dock_match(device
)))
1131 acpi_add_id(device
, ACPI_DOCK_HID
);
1132 else if (!acpi_ibm_smbus_match(device
))
1133 acpi_add_id(device
, ACPI_SMBUS_IBM_HID
);
1134 else if (!acpi_device_hid(device
) &&
1135 ACPI_IS_ROOT_DEVICE(device
->parent
)) {
1136 acpi_add_id(device
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1137 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1138 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1142 case ACPI_BUS_TYPE_POWER
:
1143 acpi_add_id(device
, ACPI_POWER_HID
);
1145 case ACPI_BUS_TYPE_PROCESSOR
:
1146 acpi_add_id(device
, ACPI_PROCESSOR_OBJECT_HID
);
1148 case ACPI_BUS_TYPE_THERMAL
:
1149 acpi_add_id(device
, ACPI_THERMAL_HID
);
1151 case ACPI_BUS_TYPE_POWER_BUTTON
:
1152 acpi_add_id(device
, ACPI_BUTTON_HID_POWERF
);
1154 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1155 acpi_add_id(device
, ACPI_BUTTON_HID_SLEEPF
);
1160 static int acpi_device_set_context(struct acpi_device
*device
)
1167 * Attach this 'struct acpi_device' to the ACPI object. This makes
1168 * resolutions from handle->device very efficient. Fixed hardware
1169 * devices have no handles, so we skip them.
1171 if (!device
->handle
)
1174 status
= acpi_attach_data(device
->handle
,
1175 acpi_bus_data_handler
, device
);
1176 if (ACPI_SUCCESS(status
))
1179 printk(KERN_ERR PREFIX
"Error attaching device data\n");
1183 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
1188 dev
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1189 device_release_driver(&dev
->dev
);
1195 * unbind _ADR-Based Devices when hot removal
1197 if (dev
->flags
.bus_address
) {
1198 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
1199 dev
->parent
->ops
.unbind(dev
);
1201 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
1206 static int acpi_add_single_object(struct acpi_device
**child
,
1207 acpi_handle handle
, int type
,
1208 unsigned long long sta
,
1209 struct acpi_bus_ops
*ops
)
1212 struct acpi_device
*device
;
1213 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1215 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1217 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1221 INIT_LIST_HEAD(&device
->pnp
.ids
);
1222 device
->device_type
= type
;
1223 device
->handle
= handle
;
1224 device
->parent
= acpi_bus_get_parent(handle
);
1225 device
->bus_ops
= *ops
; /* workround for not call .start */
1226 STRUCT_TO_INT(device
->status
) = sta
;
1228 acpi_device_get_busid(device
);
1233 * Note that we only look for object handles -- cannot evaluate objects
1234 * until we know the device is present and properly initialized.
1236 result
= acpi_bus_get_flags(device
);
1243 * TBD: Synch with Core's enumeration/initialization process.
1245 acpi_device_set_id(device
);
1251 if (device
->flags
.power_manageable
) {
1252 result
= acpi_bus_get_power_flags(device
);
1258 * Wakeup device management
1259 *-----------------------
1261 if (device
->flags
.wake_capable
) {
1262 result
= acpi_bus_get_wakeup_device_flags(device
);
1268 * Performance Management
1269 * ----------------------
1271 if (device
->flags
.performance_manageable
) {
1272 result
= acpi_bus_get_perf_flags(device
);
1277 if ((result
= acpi_device_set_context(device
)))
1280 result
= acpi_device_register(device
);
1283 * Bind _ADR-Based Devices when hot add
1285 if (device
->flags
.bus_address
) {
1286 if (device
->parent
&& device
->parent
->ops
.bind
)
1287 device
->parent
->ops
.bind(device
);
1292 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1293 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1294 "Adding %s [%s] parent %s\n", dev_name(&device
->dev
),
1295 (char *) buffer
.pointer
,
1296 device
->parent
? dev_name(&device
->parent
->dev
) :
1298 kfree(buffer
.pointer
);
1301 acpi_device_release(&device
->dev
);
1306 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1307 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1309 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1310 unsigned long long *sta
)
1313 acpi_object_type acpi_type
;
1315 status
= acpi_get_type(handle
, &acpi_type
);
1316 if (ACPI_FAILURE(status
))
1319 switch (acpi_type
) {
1320 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1321 case ACPI_TYPE_DEVICE
:
1322 *type
= ACPI_BUS_TYPE_DEVICE
;
1323 status
= acpi_bus_get_status_handle(handle
, sta
);
1324 if (ACPI_FAILURE(status
))
1327 case ACPI_TYPE_PROCESSOR
:
1328 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1329 status
= acpi_bus_get_status_handle(handle
, sta
);
1330 if (ACPI_FAILURE(status
))
1333 case ACPI_TYPE_THERMAL
:
1334 *type
= ACPI_BUS_TYPE_THERMAL
;
1335 *sta
= ACPI_STA_DEFAULT
;
1337 case ACPI_TYPE_POWER
:
1338 *type
= ACPI_BUS_TYPE_POWER
;
1339 *sta
= ACPI_STA_DEFAULT
;
1348 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl
,
1349 void *context
, void **return_value
)
1351 struct acpi_bus_ops
*ops
= context
;
1353 unsigned long long sta
;
1354 struct acpi_device
*device
;
1358 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1362 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1363 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
))
1364 return AE_CTRL_DEPTH
;
1367 * We may already have an acpi_device from a previous enumeration. If
1368 * so, we needn't add it again, but we may still have to start it.
1371 acpi_bus_get_device(handle
, &device
);
1372 if (ops
->acpi_op_add
&& !device
)
1373 acpi_add_single_object(&device
, handle
, type
, sta
, ops
);
1376 return AE_CTRL_DEPTH
;
1378 if (ops
->acpi_op_start
&& !(ops
->acpi_op_add
)) {
1379 status
= acpi_start_single_object(device
);
1380 if (ACPI_FAILURE(status
))
1381 return AE_CTRL_DEPTH
;
1385 *return_value
= device
;
1389 static int acpi_bus_scan(acpi_handle handle
, struct acpi_bus_ops
*ops
,
1390 struct acpi_device
**child
)
1393 void *device
= NULL
;
1395 status
= acpi_bus_check_add(handle
, 0, ops
, &device
);
1396 if (ACPI_SUCCESS(status
))
1397 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1398 acpi_bus_check_add
, NULL
, ops
, &device
);
1410 * acpi_bus_add and acpi_bus_start
1412 * scan a given ACPI tree and (probably recently hot-plugged)
1413 * create and add or starts found devices.
1415 * If no devices were found -ENODEV is returned which does not
1416 * mean that this is a real error, there just have been no suitable
1417 * ACPI objects in the table trunk from which the kernel could create
1418 * a device and add/start an appropriate driver.
1422 acpi_bus_add(struct acpi_device
**child
,
1423 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1425 struct acpi_bus_ops ops
;
1427 memset(&ops
, 0, sizeof(ops
));
1428 ops
.acpi_op_add
= 1;
1430 return acpi_bus_scan(handle
, &ops
, child
);
1432 EXPORT_SYMBOL(acpi_bus_add
);
1434 int acpi_bus_start(struct acpi_device
*device
)
1436 struct acpi_bus_ops ops
;
1442 memset(&ops
, 0, sizeof(ops
));
1443 ops
.acpi_op_start
= 1;
1445 result
= acpi_bus_scan(device
->handle
, &ops
, NULL
);
1451 EXPORT_SYMBOL(acpi_bus_start
);
1453 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1456 struct acpi_device
*parent
, *child
;
1457 acpi_handle phandle
, chandle
;
1458 acpi_object_type type
;
1463 phandle
= start
->handle
;
1464 child
= chandle
= NULL
;
1466 while ((level
> 0) && parent
&& (!err
)) {
1467 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1471 * If this scope is exhausted then move our way back up.
1473 if (ACPI_FAILURE(status
)) {
1476 acpi_get_parent(phandle
, &phandle
);
1478 parent
= parent
->parent
;
1481 err
= acpi_bus_remove(child
, rmdevice
);
1483 err
= acpi_bus_remove(child
, 1);
1488 status
= acpi_get_type(chandle
, &type
);
1489 if (ACPI_FAILURE(status
)) {
1493 * If there is a device corresponding to chandle then
1494 * parse it (depth-first).
1496 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1506 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1508 static int acpi_bus_scan_fixed(void)
1511 struct acpi_device
*device
= NULL
;
1512 struct acpi_bus_ops ops
;
1514 memset(&ops
, 0, sizeof(ops
));
1515 ops
.acpi_op_add
= 1;
1516 ops
.acpi_op_start
= 1;
1519 * Enumerate all fixed-feature devices.
1521 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1522 result
= acpi_add_single_object(&device
, NULL
,
1523 ACPI_BUS_TYPE_POWER_BUTTON
,
1528 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1529 result
= acpi_add_single_object(&device
, NULL
,
1530 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1538 int __init
acpi_scan_init(void)
1541 struct acpi_bus_ops ops
;
1543 memset(&ops
, 0, sizeof(ops
));
1544 ops
.acpi_op_add
= 1;
1545 ops
.acpi_op_start
= 1;
1547 result
= bus_register(&acpi_bus_type
);
1549 /* We don't want to quit even if we failed to add suspend/resume */
1550 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1554 * Enumerate devices in the ACPI namespace.
1556 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
, &ops
, &acpi_root
);
1559 result
= acpi_bus_scan_fixed();
1562 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);