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_bus_match(struct device
*dev
, struct device_driver
*drv
)
295 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
296 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
298 return !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
301 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
303 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
306 if (list_empty(&acpi_dev
->pnp
.ids
))
309 if (add_uevent_var(env
, "MODALIAS="))
311 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
312 sizeof(env
->buf
) - env
->buflen
);
313 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
319 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
321 struct acpi_device
*device
= data
;
323 device
->driver
->ops
.notify(device
, event
);
326 static acpi_status
acpi_device_notify_fixed(void *data
)
328 struct acpi_device
*device
= data
;
330 /* Fixed hardware devices have no handles */
331 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
335 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
339 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
341 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
342 acpi_device_notify_fixed
,
344 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
346 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
347 acpi_device_notify_fixed
,
350 status
= acpi_install_notify_handler(device
->handle
,
355 if (ACPI_FAILURE(status
))
360 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
362 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
363 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
364 acpi_device_notify_fixed
);
365 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
366 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
367 acpi_device_notify_fixed
);
369 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
373 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
374 static int acpi_start_single_object(struct acpi_device
*);
375 static int acpi_device_probe(struct device
* dev
)
377 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
378 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
381 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
383 if (acpi_dev
->bus_ops
.acpi_op_start
)
384 acpi_start_single_object(acpi_dev
);
386 if (acpi_drv
->ops
.notify
) {
387 ret
= acpi_device_install_notify_handler(acpi_dev
);
389 if (acpi_drv
->ops
.remove
)
390 acpi_drv
->ops
.remove(acpi_dev
,
391 acpi_dev
->removal_type
);
396 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
397 "Found driver [%s] for device [%s]\n",
398 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
404 static int acpi_device_remove(struct device
* dev
)
406 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
407 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
410 if (acpi_drv
->ops
.notify
)
411 acpi_device_remove_notify_handler(acpi_dev
);
412 if (acpi_drv
->ops
.remove
)
413 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
415 acpi_dev
->driver
= NULL
;
416 acpi_dev
->driver_data
= NULL
;
422 struct bus_type acpi_bus_type
= {
424 .match
= acpi_bus_match
,
425 .probe
= acpi_device_probe
,
426 .remove
= acpi_device_remove
,
427 .uevent
= acpi_device_uevent
,
430 static int acpi_device_register(struct acpi_device
*device
)
433 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
439 * Link this device to its parent and siblings.
441 INIT_LIST_HEAD(&device
->children
);
442 INIT_LIST_HEAD(&device
->node
);
443 INIT_LIST_HEAD(&device
->wakeup_list
);
445 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
447 printk(KERN_ERR PREFIX
"Memory allocation error\n");
451 mutex_lock(&acpi_device_lock
);
453 * Find suitable bus_id and instance number in acpi_bus_id_list
454 * If failed, create one and link it into acpi_bus_id_list
456 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
457 if (!strcmp(acpi_device_bus_id
->bus_id
,
458 acpi_device_hid(device
))) {
459 acpi_device_bus_id
->instance_no
++;
466 acpi_device_bus_id
= new_bus_id
;
467 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
468 acpi_device_bus_id
->instance_no
= 0;
469 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
471 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
474 list_add_tail(&device
->node
, &device
->parent
->children
);
476 if (device
->wakeup
.flags
.valid
)
477 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
478 mutex_unlock(&acpi_device_lock
);
481 device
->dev
.parent
= &device
->parent
->dev
;
482 device
->dev
.bus
= &acpi_bus_type
;
483 device
->dev
.release
= &acpi_device_release
;
484 result
= device_register(&device
->dev
);
486 dev_err(&device
->dev
, "Error registering device\n");
490 result
= acpi_device_setup_files(device
);
492 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
493 dev_name(&device
->dev
));
495 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
498 mutex_lock(&acpi_device_lock
);
500 list_del(&device
->node
);
501 list_del(&device
->wakeup_list
);
502 mutex_unlock(&acpi_device_lock
);
506 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
508 mutex_lock(&acpi_device_lock
);
510 list_del(&device
->node
);
512 list_del(&device
->wakeup_list
);
513 mutex_unlock(&acpi_device_lock
);
515 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
517 acpi_device_remove_files(device
);
518 device_unregister(&device
->dev
);
521 /* --------------------------------------------------------------------------
523 -------------------------------------------------------------------------- */
525 * acpi_bus_driver_init - add a device to a driver
526 * @device: the device to add and initialize
527 * @driver: driver for the device
529 * Used to initialize a device via its device driver. Called whenever a
530 * driver is bound to a device. Invokes the driver's add() ops.
533 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
537 if (!device
|| !driver
)
540 if (!driver
->ops
.add
)
543 result
= driver
->ops
.add(device
);
545 device
->driver
= NULL
;
546 device
->driver_data
= NULL
;
550 device
->driver
= driver
;
553 * TBD - Configuration Management: Assign resources to device based
554 * upon possible configuration and currently allocated resources.
557 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
558 "Driver successfully bound to device\n"));
562 static int acpi_start_single_object(struct acpi_device
*device
)
565 struct acpi_driver
*driver
;
568 if (!(driver
= device
->driver
))
571 if (driver
->ops
.start
) {
572 result
= driver
->ops
.start(device
);
573 if (result
&& driver
->ops
.remove
)
574 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
581 * acpi_bus_register_driver - register a driver with the ACPI bus
582 * @driver: driver being registered
584 * Registers a driver with the ACPI bus. Searches the namespace for all
585 * devices that match the driver's criteria and binds. Returns zero for
586 * success or a negative error status for failure.
588 int acpi_bus_register_driver(struct acpi_driver
*driver
)
594 driver
->drv
.name
= driver
->name
;
595 driver
->drv
.bus
= &acpi_bus_type
;
596 driver
->drv
.owner
= driver
->owner
;
598 ret
= driver_register(&driver
->drv
);
602 EXPORT_SYMBOL(acpi_bus_register_driver
);
605 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
606 * @driver: driver to unregister
608 * Unregisters a driver with the ACPI bus. Searches the namespace for all
609 * devices that match the driver's criteria and unbinds.
611 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
613 driver_unregister(&driver
->drv
);
616 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
618 /* --------------------------------------------------------------------------
620 -------------------------------------------------------------------------- */
621 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
625 struct acpi_device
*device
;
628 * Fixed hardware devices do not appear in the namespace and do not
629 * have handles, but we fabricate acpi_devices for them, so we have
630 * to deal with them specially.
636 status
= acpi_get_parent(handle
, &handle
);
637 if (status
== AE_NULL_ENTRY
)
639 if (ACPI_FAILURE(status
))
642 ret
= acpi_bus_get_device(handle
, &device
);
649 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
653 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
654 union acpi_object
*obj
;
656 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
657 if (ACPI_FAILURE(status
))
660 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
661 if (ACPI_SUCCESS(status
)) {
662 obj
= buffer
.pointer
;
663 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
665 kfree(buffer
.pointer
);
669 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
671 void acpi_bus_data_handler(acpi_handle handle
, void *context
)
679 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
681 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
686 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
687 struct acpi_device_wakeup
*wakeup
)
689 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
690 union acpi_object
*package
= NULL
;
691 union acpi_object
*element
= NULL
;
696 return AE_BAD_PARAMETER
;
699 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
700 if (ACPI_FAILURE(status
)) {
701 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
705 package
= (union acpi_object
*)buffer
.pointer
;
707 if (!package
|| (package
->package
.count
< 2)) {
708 status
= AE_BAD_DATA
;
712 element
= &(package
->package
.elements
[0]);
714 status
= AE_BAD_DATA
;
717 if (element
->type
== ACPI_TYPE_PACKAGE
) {
718 if ((element
->package
.count
< 2) ||
719 (element
->package
.elements
[0].type
!=
720 ACPI_TYPE_LOCAL_REFERENCE
)
721 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
)) {
722 status
= AE_BAD_DATA
;
726 element
->package
.elements
[0].reference
.handle
;
728 (u32
) element
->package
.elements
[1].integer
.value
;
729 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
730 wakeup
->gpe_device
= NULL
;
731 wakeup
->gpe_number
= element
->integer
.value
;
733 status
= AE_BAD_DATA
;
737 element
= &(package
->package
.elements
[1]);
738 if (element
->type
!= ACPI_TYPE_INTEGER
) {
739 status
= AE_BAD_DATA
;
742 wakeup
->sleep_state
= element
->integer
.value
;
744 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
745 status
= AE_NO_MEMORY
;
748 wakeup
->resources
.count
= package
->package
.count
- 2;
749 for (i
= 0; i
< wakeup
->resources
.count
; i
++) {
750 element
= &(package
->package
.elements
[i
+ 2]);
751 if (element
->type
!= ACPI_TYPE_LOCAL_REFERENCE
) {
752 status
= AE_BAD_DATA
;
756 wakeup
->resources
.handles
[i
] = element
->reference
.handle
;
759 acpi_setup_gpe_for_wake(handle
, wakeup
->gpe_device
, wakeup
->gpe_number
);
762 kfree(buffer
.pointer
);
767 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
769 struct acpi_device_id button_device_ids
[] = {
776 acpi_event_status event_status
;
778 device
->wakeup
.flags
.notifier_present
= 0;
780 /* Power button, Lid switch always enable wakeup */
781 if (!acpi_match_device_ids(device
, button_device_ids
)) {
782 device
->wakeup
.flags
.run_wake
= 1;
783 device_set_wakeup_capable(&device
->dev
, true);
787 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
788 device
->wakeup
.gpe_number
,
791 device
->wakeup
.flags
.run_wake
=
792 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
795 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
798 acpi_status status
= 0;
801 /* Presence of _PRW indicates wake capable */
802 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
803 if (ACPI_FAILURE(status
))
806 status
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
808 if (ACPI_FAILURE(status
)) {
809 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
813 device
->wakeup
.flags
.valid
= 1;
814 device
->wakeup
.prepare_count
= 0;
815 acpi_bus_set_run_wake_flags(device
);
816 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
817 * system for the ACPI device with the _PRW object.
818 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
819 * So it is necessary to call _DSW object first. Only when it is not
820 * present will the _PSW object used.
822 psw_error
= acpi_device_sleep_wake(device
, 0, 0, 0);
824 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
825 "error in _DSW or _PSW evaluation\n"));
828 static void acpi_bus_add_power_resource(acpi_handle handle
);
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_HOT
; 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
) {
860 device
->power
.flags
.power_resources
= 1;
861 for (j
= 0; j
< ps
->resources
.count
; j
++)
862 acpi_bus_add_power_resource(ps
->resources
.handles
[j
]);
865 /* Evaluate "_PSx" to see if we can do explicit sets */
866 object_name
[2] = 'S';
867 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
868 if (ACPI_SUCCESS(status
))
869 ps
->flags
.explicit_set
= 1;
872 * State is valid if there are means to put the device into it.
873 * D3hot is only valid if _PR3 present.
875 if (ps
->resources
.count
||
876 (ps
->flags
.explicit_set
&& i
< ACPI_STATE_D3_HOT
))
879 ps
->power
= -1; /* Unknown - driver assigned */
880 ps
->latency
= -1; /* Unknown - driver assigned */
883 /* Set defaults for D0 and D3 states (always valid) */
884 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
885 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
886 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
887 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
889 /* Set D3cold's explicit_set flag if _PS3 exists. */
890 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
891 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
893 acpi_bus_init_power(device
);
898 static int acpi_bus_get_flags(struct acpi_device
*device
)
900 acpi_status status
= AE_OK
;
901 acpi_handle temp
= NULL
;
904 /* Presence of _STA indicates 'dynamic_status' */
905 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
906 if (ACPI_SUCCESS(status
))
907 device
->flags
.dynamic_status
= 1;
909 /* Presence of _RMV indicates 'removable' */
910 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
911 if (ACPI_SUCCESS(status
))
912 device
->flags
.removable
= 1;
914 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
915 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
916 if (ACPI_SUCCESS(status
))
917 device
->flags
.ejectable
= 1;
919 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
920 if (ACPI_SUCCESS(status
))
921 device
->flags
.ejectable
= 1;
924 /* Presence of _LCK indicates 'lockable' */
925 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
926 if (ACPI_SUCCESS(status
))
927 device
->flags
.lockable
= 1;
929 /* Power resources cannot be power manageable. */
930 if (device
->device_type
== ACPI_BUS_TYPE_POWER
)
933 /* Presence of _PS0|_PR0 indicates 'power manageable' */
934 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
935 if (ACPI_FAILURE(status
))
936 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
937 if (ACPI_SUCCESS(status
))
938 device
->flags
.power_manageable
= 1;
940 /* TBD: Performance management */
945 static void acpi_device_get_busid(struct acpi_device
*device
)
947 char bus_id
[5] = { '?', 0 };
948 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
954 * The device's Bus ID is simply the object name.
955 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
957 if (ACPI_IS_ROOT_DEVICE(device
)) {
958 strcpy(device
->pnp
.bus_id
, "ACPI");
962 switch (device
->device_type
) {
963 case ACPI_BUS_TYPE_POWER_BUTTON
:
964 strcpy(device
->pnp
.bus_id
, "PWRF");
966 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
967 strcpy(device
->pnp
.bus_id
, "SLPF");
970 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
971 /* Clean up trailing underscores (if any) */
972 for (i
= 3; i
> 1; i
--) {
973 if (bus_id
[i
] == '_')
978 strcpy(device
->pnp
.bus_id
, bus_id
);
984 * acpi_bay_match - see if a device is an ejectable driver bay
986 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
987 * then we can safely call it an ejectable drive bay
989 static int acpi_bay_match(struct acpi_device
*device
){
995 handle
= device
->handle
;
997 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
998 if (ACPI_FAILURE(status
))
1001 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
1002 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
1003 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
1004 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
1007 if (acpi_get_parent(handle
, &phandle
))
1010 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
1011 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
1012 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
1013 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
1020 * acpi_dock_match - see if a device has a _DCK method
1022 static int acpi_dock_match(struct acpi_device
*device
)
1025 return acpi_get_handle(device
->handle
, "_DCK", &tmp
);
1028 const char *acpi_device_hid(struct acpi_device
*device
)
1030 struct acpi_hardware_id
*hid
;
1032 if (list_empty(&device
->pnp
.ids
))
1035 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1038 EXPORT_SYMBOL(acpi_device_hid
);
1040 static void acpi_add_id(struct acpi_device
*device
, const char *dev_id
)
1042 struct acpi_hardware_id
*id
;
1044 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1048 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1054 list_add_tail(&id
->list
, &device
->pnp
.ids
);
1058 * Old IBM workstations have a DSDT bug wherein the SMBus object
1059 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1060 * prefix. Work around this.
1062 static int acpi_ibm_smbus_match(struct acpi_device
*device
)
1064 acpi_handle h_dummy
;
1065 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1068 if (!dmi_name_in_vendors("IBM"))
1071 /* Look for SMBS object */
1072 result
= acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &path
);
1076 if (strcmp("SMBS", path
.pointer
)) {
1081 /* Does it have the necessary (but misnamed) methods? */
1083 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBI", &h_dummy
)) &&
1084 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBR", &h_dummy
)) &&
1085 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "SBW", &h_dummy
)))
1088 kfree(path
.pointer
);
1092 static void acpi_device_set_id(struct acpi_device
*device
)
1095 struct acpi_device_info
*info
;
1096 struct acpica_device_id_list
*cid_list
;
1099 switch (device
->device_type
) {
1100 case ACPI_BUS_TYPE_DEVICE
:
1101 if (ACPI_IS_ROOT_DEVICE(device
)) {
1102 acpi_add_id(device
, ACPI_SYSTEM_HID
);
1106 status
= acpi_get_object_info(device
->handle
, &info
);
1107 if (ACPI_FAILURE(status
)) {
1108 printk(KERN_ERR PREFIX
"%s: Error reading device info\n", __func__
);
1112 if (info
->valid
& ACPI_VALID_HID
)
1113 acpi_add_id(device
, info
->hardware_id
.string
);
1114 if (info
->valid
& ACPI_VALID_CID
) {
1115 cid_list
= &info
->compatible_id_list
;
1116 for (i
= 0; i
< cid_list
->count
; i
++)
1117 acpi_add_id(device
, cid_list
->ids
[i
].string
);
1119 if (info
->valid
& ACPI_VALID_ADR
) {
1120 device
->pnp
.bus_address
= info
->address
;
1121 device
->flags
.bus_address
= 1;
1127 * Some devices don't reliably have _HIDs & _CIDs, so add
1128 * synthetic HIDs to make sure drivers can find them.
1130 if (acpi_is_video_device(device
))
1131 acpi_add_id(device
, ACPI_VIDEO_HID
);
1132 else if (ACPI_SUCCESS(acpi_bay_match(device
)))
1133 acpi_add_id(device
, ACPI_BAY_HID
);
1134 else if (ACPI_SUCCESS(acpi_dock_match(device
)))
1135 acpi_add_id(device
, ACPI_DOCK_HID
);
1136 else if (!acpi_ibm_smbus_match(device
))
1137 acpi_add_id(device
, ACPI_SMBUS_IBM_HID
);
1138 else if (!acpi_device_hid(device
) &&
1139 ACPI_IS_ROOT_DEVICE(device
->parent
)) {
1140 acpi_add_id(device
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1141 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1142 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1146 case ACPI_BUS_TYPE_POWER
:
1147 acpi_add_id(device
, ACPI_POWER_HID
);
1149 case ACPI_BUS_TYPE_PROCESSOR
:
1150 acpi_add_id(device
, ACPI_PROCESSOR_OBJECT_HID
);
1152 case ACPI_BUS_TYPE_THERMAL
:
1153 acpi_add_id(device
, ACPI_THERMAL_HID
);
1155 case ACPI_BUS_TYPE_POWER_BUTTON
:
1156 acpi_add_id(device
, ACPI_BUTTON_HID_POWERF
);
1158 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1159 acpi_add_id(device
, ACPI_BUTTON_HID_SLEEPF
);
1164 static int acpi_device_set_context(struct acpi_device
*device
)
1171 * Attach this 'struct acpi_device' to the ACPI object. This makes
1172 * resolutions from handle->device very efficient. Fixed hardware
1173 * devices have no handles, so we skip them.
1175 if (!device
->handle
)
1178 status
= acpi_attach_data(device
->handle
,
1179 acpi_bus_data_handler
, device
);
1180 if (ACPI_SUCCESS(status
))
1183 printk(KERN_ERR PREFIX
"Error attaching device data\n");
1187 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
1192 dev
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1193 device_release_driver(&dev
->dev
);
1199 * unbind _ADR-Based Devices when hot removal
1201 if (dev
->flags
.bus_address
) {
1202 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
1203 dev
->parent
->ops
.unbind(dev
);
1205 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
1210 static int acpi_add_single_object(struct acpi_device
**child
,
1211 acpi_handle handle
, int type
,
1212 unsigned long long sta
,
1213 struct acpi_bus_ops
*ops
)
1216 struct acpi_device
*device
;
1217 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1219 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1221 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1225 INIT_LIST_HEAD(&device
->pnp
.ids
);
1226 device
->device_type
= type
;
1227 device
->handle
= handle
;
1228 device
->parent
= acpi_bus_get_parent(handle
);
1229 device
->bus_ops
= *ops
; /* workround for not call .start */
1230 STRUCT_TO_INT(device
->status
) = sta
;
1232 acpi_device_get_busid(device
);
1237 * Note that we only look for object handles -- cannot evaluate objects
1238 * until we know the device is present and properly initialized.
1240 result
= acpi_bus_get_flags(device
);
1247 * TBD: Synch with Core's enumeration/initialization process.
1249 acpi_device_set_id(device
);
1255 if (device
->flags
.power_manageable
) {
1256 result
= acpi_bus_get_power_flags(device
);
1262 * Wakeup device management
1263 *-----------------------
1265 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 void acpi_bus_add_power_resource(acpi_handle handle
)
1311 struct acpi_bus_ops ops
= {
1315 struct acpi_device
*device
= NULL
;
1317 acpi_bus_get_device(handle
, &device
);
1319 acpi_add_single_object(&device
, handle
, ACPI_BUS_TYPE_POWER
,
1320 ACPI_STA_DEFAULT
, &ops
);
1323 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1324 unsigned long long *sta
)
1327 acpi_object_type acpi_type
;
1329 status
= acpi_get_type(handle
, &acpi_type
);
1330 if (ACPI_FAILURE(status
))
1333 switch (acpi_type
) {
1334 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1335 case ACPI_TYPE_DEVICE
:
1336 *type
= ACPI_BUS_TYPE_DEVICE
;
1337 status
= acpi_bus_get_status_handle(handle
, sta
);
1338 if (ACPI_FAILURE(status
))
1341 case ACPI_TYPE_PROCESSOR
:
1342 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1343 status
= acpi_bus_get_status_handle(handle
, sta
);
1344 if (ACPI_FAILURE(status
))
1347 case ACPI_TYPE_THERMAL
:
1348 *type
= ACPI_BUS_TYPE_THERMAL
;
1349 *sta
= ACPI_STA_DEFAULT
;
1351 case ACPI_TYPE_POWER
:
1352 *type
= ACPI_BUS_TYPE_POWER
;
1353 *sta
= ACPI_STA_DEFAULT
;
1362 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl
,
1363 void *context
, void **return_value
)
1365 struct acpi_bus_ops
*ops
= context
;
1367 unsigned long long sta
;
1368 struct acpi_device
*device
;
1372 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1376 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1377 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
)) {
1378 struct acpi_device_wakeup wakeup
;
1381 status
= acpi_get_handle(handle
, "_PRW", &temp
);
1382 if (ACPI_SUCCESS(status
))
1383 acpi_bus_extract_wakeup_device_power_package(handle
,
1385 return AE_CTRL_DEPTH
;
1389 * We may already have an acpi_device from a previous enumeration. If
1390 * so, we needn't add it again, but we may still have to start it.
1393 acpi_bus_get_device(handle
, &device
);
1394 if (ops
->acpi_op_add
&& !device
)
1395 acpi_add_single_object(&device
, handle
, type
, sta
, ops
);
1398 return AE_CTRL_DEPTH
;
1400 if (ops
->acpi_op_start
&& !(ops
->acpi_op_add
)) {
1401 status
= acpi_start_single_object(device
);
1402 if (ACPI_FAILURE(status
))
1403 return AE_CTRL_DEPTH
;
1407 *return_value
= device
;
1411 static int acpi_bus_scan(acpi_handle handle
, struct acpi_bus_ops
*ops
,
1412 struct acpi_device
**child
)
1415 void *device
= NULL
;
1417 status
= acpi_bus_check_add(handle
, 0, ops
, &device
);
1418 if (ACPI_SUCCESS(status
))
1419 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1420 acpi_bus_check_add
, NULL
, ops
, &device
);
1432 * acpi_bus_add and acpi_bus_start
1434 * scan a given ACPI tree and (probably recently hot-plugged)
1435 * create and add or starts found devices.
1437 * If no devices were found -ENODEV is returned which does not
1438 * mean that this is a real error, there just have been no suitable
1439 * ACPI objects in the table trunk from which the kernel could create
1440 * a device and add/start an appropriate driver.
1444 acpi_bus_add(struct acpi_device
**child
,
1445 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1447 struct acpi_bus_ops ops
;
1449 memset(&ops
, 0, sizeof(ops
));
1450 ops
.acpi_op_add
= 1;
1452 return acpi_bus_scan(handle
, &ops
, child
);
1454 EXPORT_SYMBOL(acpi_bus_add
);
1456 int acpi_bus_start(struct acpi_device
*device
)
1458 struct acpi_bus_ops ops
;
1464 memset(&ops
, 0, sizeof(ops
));
1465 ops
.acpi_op_start
= 1;
1467 result
= acpi_bus_scan(device
->handle
, &ops
, NULL
);
1469 acpi_update_all_gpes();
1473 EXPORT_SYMBOL(acpi_bus_start
);
1475 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1478 struct acpi_device
*parent
, *child
;
1479 acpi_handle phandle
, chandle
;
1480 acpi_object_type type
;
1485 phandle
= start
->handle
;
1486 child
= chandle
= NULL
;
1488 while ((level
> 0) && parent
&& (!err
)) {
1489 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1493 * If this scope is exhausted then move our way back up.
1495 if (ACPI_FAILURE(status
)) {
1498 acpi_get_parent(phandle
, &phandle
);
1500 parent
= parent
->parent
;
1503 err
= acpi_bus_remove(child
, rmdevice
);
1505 err
= acpi_bus_remove(child
, 1);
1510 status
= acpi_get_type(chandle
, &type
);
1511 if (ACPI_FAILURE(status
)) {
1515 * If there is a device corresponding to chandle then
1516 * parse it (depth-first).
1518 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1528 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1530 static int acpi_bus_scan_fixed(void)
1533 struct acpi_device
*device
= NULL
;
1534 struct acpi_bus_ops ops
;
1536 memset(&ops
, 0, sizeof(ops
));
1537 ops
.acpi_op_add
= 1;
1538 ops
.acpi_op_start
= 1;
1541 * Enumerate all fixed-feature devices.
1543 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1544 result
= acpi_add_single_object(&device
, NULL
,
1545 ACPI_BUS_TYPE_POWER_BUTTON
,
1548 device_init_wakeup(&device
->dev
, true);
1551 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1552 result
= acpi_add_single_object(&device
, NULL
,
1553 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1561 int __init
acpi_scan_init(void)
1564 struct acpi_bus_ops ops
;
1566 memset(&ops
, 0, sizeof(ops
));
1567 ops
.acpi_op_add
= 1;
1568 ops
.acpi_op_start
= 1;
1570 result
= bus_register(&acpi_bus_type
);
1572 /* We don't want to quit even if we failed to add suspend/resume */
1573 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1579 * Enumerate devices in the ACPI namespace.
1581 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
, &ops
, &acpi_root
);
1584 result
= acpi_bus_scan_fixed();
1587 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);
1589 acpi_update_all_gpes();