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/kernel.h>
8 #include <linux/acpi.h>
9 #include <linux/signal.h>
10 #include <linux/kthread.h>
12 #include <acpi/acpi_drivers.h>
16 #define _COMPONENT ACPI_BUS_COMPONENT
17 ACPI_MODULE_NAME("scan");
18 #define STRUCT_TO_INT(s) (*((int*)&s))
19 extern struct acpi_device
*acpi_root
;
21 #define ACPI_BUS_CLASS "system_bus"
22 #define ACPI_BUS_HID "LNXSYBUS"
23 #define ACPI_BUS_DEVICE_NAME "System Bus"
25 static LIST_HEAD(acpi_device_list
);
26 static LIST_HEAD(acpi_bus_id_list
);
27 DEFINE_MUTEX(acpi_device_lock
);
28 LIST_HEAD(acpi_wakeup_device_list
);
30 struct acpi_device_bus_id
{
32 unsigned int instance_no
;
33 struct list_head node
;
37 * Creates hid/cid(s) string needed for modalias and uevent
38 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
39 * char *modalias: "acpi:IBM0001:ACPI0001"
41 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
47 if (!acpi_dev
->flags
.hardware_id
&& !acpi_dev
->flags
.compatible_ids
)
50 len
= snprintf(modalias
, size
, "acpi:");
53 if (acpi_dev
->flags
.hardware_id
) {
54 count
= snprintf(&modalias
[len
], size
, "%s:",
55 acpi_dev
->pnp
.hardware_id
);
56 if (count
< 0 || count
>= size
)
62 if (acpi_dev
->flags
.compatible_ids
) {
63 struct acpica_device_id_list
*cid_list
;
66 cid_list
= acpi_dev
->pnp
.cid_list
;
67 for (i
= 0; i
< cid_list
->count
; i
++) {
68 count
= snprintf(&modalias
[len
], size
, "%s:",
69 cid_list
->ids
[i
].string
);
70 if (count
< 0 || count
>= size
) {
71 printk(KERN_ERR PREFIX
"%s cid[%i] exceeds event buffer size",
72 acpi_dev
->pnp
.device_name
, i
);
85 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
86 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
89 /* Device has no HID and no CID or string is >1024 */
90 len
= create_modalias(acpi_dev
, buf
, 1024);
96 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
98 static void acpi_bus_hot_remove_device(void *context
)
100 struct acpi_device
*device
;
101 acpi_handle handle
= context
;
102 struct acpi_object_list arg_list
;
103 union acpi_object arg
;
104 acpi_status status
= AE_OK
;
106 if (acpi_bus_get_device(handle
, &device
))
112 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
113 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
115 if (acpi_bus_trim(device
, 1)) {
116 printk(KERN_ERR PREFIX
117 "Removing device failed\n");
121 /* power off device */
122 status
= acpi_evaluate_object(handle
, "_PS3", NULL
, NULL
);
123 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
)
124 printk(KERN_WARNING PREFIX
125 "Power-off device failed\n");
127 if (device
->flags
.lockable
) {
129 arg_list
.pointer
= &arg
;
130 arg
.type
= ACPI_TYPE_INTEGER
;
131 arg
.integer
.value
= 0;
132 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
136 arg_list
.pointer
= &arg
;
137 arg
.type
= ACPI_TYPE_INTEGER
;
138 arg
.integer
.value
= 1;
143 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
144 if (ACPI_FAILURE(status
))
145 printk(KERN_WARNING PREFIX
146 "Eject device failed\n");
152 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
153 const char *buf
, size_t count
)
157 acpi_object_type type
= 0;
158 struct acpi_device
*acpi_device
= to_acpi_device(d
);
160 if ((!count
) || (buf
[0] != '1')) {
164 if (acpi_device
->driver
== NULL
) {
169 status
= acpi_get_type(acpi_device
->handle
, &type
);
170 if (ACPI_FAILURE(status
) || (!acpi_device
->flags
.ejectable
)) {
175 acpi_os_hotplug_execute(acpi_bus_hot_remove_device
, acpi_device
->handle
);
180 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
183 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
184 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
186 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.hardware_id
);
188 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
191 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
192 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
193 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
196 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
200 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
205 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
207 static int acpi_device_setup_files(struct acpi_device
*dev
)
214 * Devices gotten from FADT don't have a "path" attribute
217 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
222 if (dev
->flags
.hardware_id
) {
223 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
228 if (dev
->flags
.hardware_id
|| dev
->flags
.compatible_ids
) {
229 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
235 * If device has _EJ0, 'eject' file is created that is used to trigger
236 * hot-removal function from userland.
238 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
239 if (ACPI_SUCCESS(status
))
240 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
245 static void acpi_device_remove_files(struct acpi_device
*dev
)
251 * If device has _EJ0, 'eject' file is created that is used to trigger
252 * hot-removal function from userland.
254 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
255 if (ACPI_SUCCESS(status
))
256 device_remove_file(&dev
->dev
, &dev_attr_eject
);
258 if (dev
->flags
.hardware_id
|| dev
->flags
.compatible_ids
)
259 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
261 if (dev
->flags
.hardware_id
)
262 device_remove_file(&dev
->dev
, &dev_attr_hid
);
264 device_remove_file(&dev
->dev
, &dev_attr_path
);
266 /* --------------------------------------------------------------------------
268 -------------------------------------------------------------------------- */
270 int acpi_match_device_ids(struct acpi_device
*device
,
271 const struct acpi_device_id
*ids
)
273 const struct acpi_device_id
*id
;
276 * If the device is not present, it is unnecessary to load device
279 if (!device
->status
.present
)
282 if (device
->flags
.hardware_id
) {
283 for (id
= ids
; id
->id
[0]; id
++) {
284 if (!strcmp((char*)id
->id
, device
->pnp
.hardware_id
))
289 if (device
->flags
.compatible_ids
) {
290 struct acpica_device_id_list
*cid_list
= device
->pnp
.cid_list
;
293 for (id
= ids
; id
->id
[0]; id
++) {
294 /* compare multiple _CID entries against driver ids */
295 for (i
= 0; i
< cid_list
->count
; i
++) {
296 if (!strcmp((char*)id
->id
,
297 cid_list
->ids
[i
].string
))
305 EXPORT_SYMBOL(acpi_match_device_ids
);
307 static void acpi_device_release(struct device
*dev
)
309 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
311 kfree(acpi_dev
->pnp
.cid_list
);
312 if (acpi_dev
->flags
.hardware_id
)
313 kfree(acpi_dev
->pnp
.hardware_id
);
314 if (acpi_dev
->flags
.unique_id
)
315 kfree(acpi_dev
->pnp
.unique_id
);
319 static int acpi_device_suspend(struct device
*dev
, pm_message_t state
)
321 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
322 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
324 if (acpi_drv
&& acpi_drv
->ops
.suspend
)
325 return acpi_drv
->ops
.suspend(acpi_dev
, state
);
329 static int acpi_device_resume(struct device
*dev
)
331 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
332 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
334 if (acpi_drv
&& acpi_drv
->ops
.resume
)
335 return acpi_drv
->ops
.resume(acpi_dev
);
339 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
341 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
342 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
344 return !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
347 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
349 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
352 if (add_uevent_var(env
, "MODALIAS="))
354 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
355 sizeof(env
->buf
) - env
->buflen
);
356 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
362 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
364 struct acpi_device
*device
= data
;
366 device
->driver
->ops
.notify(device
, event
);
369 static acpi_status
acpi_device_notify_fixed(void *data
)
371 struct acpi_device
*device
= data
;
373 /* Fixed hardware devices have no handles */
374 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
378 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
383 hid
= acpi_device_hid(device
);
384 if (!strcmp(hid
, ACPI_BUTTON_HID_POWERF
))
386 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
387 acpi_device_notify_fixed
,
389 else if (!strcmp(hid
, ACPI_BUTTON_HID_SLEEPF
))
391 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
392 acpi_device_notify_fixed
,
395 status
= acpi_install_notify_handler(device
->handle
,
400 if (ACPI_FAILURE(status
))
405 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
407 if (!strcmp(acpi_device_hid(device
), ACPI_BUTTON_HID_POWERF
))
408 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
409 acpi_device_notify_fixed
);
410 else if (!strcmp(acpi_device_hid(device
), ACPI_BUTTON_HID_SLEEPF
))
411 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
412 acpi_device_notify_fixed
);
414 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
418 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
419 static int acpi_start_single_object(struct acpi_device
*);
420 static int acpi_device_probe(struct device
* dev
)
422 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
423 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
426 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
428 if (acpi_dev
->bus_ops
.acpi_op_start
)
429 acpi_start_single_object(acpi_dev
);
431 if (acpi_drv
->ops
.notify
) {
432 ret
= acpi_device_install_notify_handler(acpi_dev
);
434 if (acpi_drv
->ops
.remove
)
435 acpi_drv
->ops
.remove(acpi_dev
,
436 acpi_dev
->removal_type
);
441 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
442 "Found driver [%s] for device [%s]\n",
443 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
449 static int acpi_device_remove(struct device
* dev
)
451 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
452 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
455 if (acpi_drv
->ops
.notify
)
456 acpi_device_remove_notify_handler(acpi_dev
);
457 if (acpi_drv
->ops
.remove
)
458 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
460 acpi_dev
->driver
= NULL
;
461 acpi_dev
->driver_data
= NULL
;
467 struct bus_type acpi_bus_type
= {
469 .suspend
= acpi_device_suspend
,
470 .resume
= acpi_device_resume
,
471 .match
= acpi_bus_match
,
472 .probe
= acpi_device_probe
,
473 .remove
= acpi_device_remove
,
474 .uevent
= acpi_device_uevent
,
477 static int acpi_device_register(struct acpi_device
*device
)
480 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
486 * Link this device to its parent and siblings.
488 INIT_LIST_HEAD(&device
->children
);
489 INIT_LIST_HEAD(&device
->node
);
490 INIT_LIST_HEAD(&device
->wakeup_list
);
492 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
494 printk(KERN_ERR PREFIX
"Memory allocation error\n");
498 mutex_lock(&acpi_device_lock
);
500 * Find suitable bus_id and instance number in acpi_bus_id_list
501 * If failed, create one and link it into acpi_bus_id_list
503 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
504 if(!strcmp(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device")) {
505 acpi_device_bus_id
->instance_no
++;
512 acpi_device_bus_id
= new_bus_id
;
513 strcpy(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device");
514 acpi_device_bus_id
->instance_no
= 0;
515 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
517 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
520 list_add_tail(&device
->node
, &device
->parent
->children
);
522 if (device
->wakeup
.flags
.valid
)
523 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
524 mutex_unlock(&acpi_device_lock
);
527 device
->dev
.parent
= &device
->parent
->dev
;
528 device
->dev
.bus
= &acpi_bus_type
;
529 device
->dev
.release
= &acpi_device_release
;
530 result
= device_register(&device
->dev
);
532 dev_err(&device
->dev
, "Error registering device\n");
536 result
= acpi_device_setup_files(device
);
538 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
539 dev_name(&device
->dev
));
541 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
544 mutex_lock(&acpi_device_lock
);
546 list_del(&device
->node
);
547 list_del(&device
->wakeup_list
);
548 mutex_unlock(&acpi_device_lock
);
552 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
554 mutex_lock(&acpi_device_lock
);
556 list_del(&device
->node
);
558 list_del(&device
->wakeup_list
);
559 mutex_unlock(&acpi_device_lock
);
561 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
563 acpi_device_remove_files(device
);
564 device_unregister(&device
->dev
);
567 /* --------------------------------------------------------------------------
569 -------------------------------------------------------------------------- */
571 * acpi_bus_driver_init - add a device to a driver
572 * @device: the device to add and initialize
573 * @driver: driver for the device
575 * Used to initialize a device via its device driver. Called whenever a
576 * driver is bound to a device. Invokes the driver's add() ops.
579 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
583 if (!device
|| !driver
)
586 if (!driver
->ops
.add
)
589 result
= driver
->ops
.add(device
);
591 device
->driver
= NULL
;
592 device
->driver_data
= NULL
;
596 device
->driver
= driver
;
599 * TBD - Configuration Management: Assign resources to device based
600 * upon possible configuration and currently allocated resources.
603 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
604 "Driver successfully bound to device\n"));
608 static int acpi_start_single_object(struct acpi_device
*device
)
611 struct acpi_driver
*driver
;
614 if (!(driver
= device
->driver
))
617 if (driver
->ops
.start
) {
618 result
= driver
->ops
.start(device
);
619 if (result
&& driver
->ops
.remove
)
620 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
627 * acpi_bus_register_driver - register a driver with the ACPI bus
628 * @driver: driver being registered
630 * Registers a driver with the ACPI bus. Searches the namespace for all
631 * devices that match the driver's criteria and binds. Returns zero for
632 * success or a negative error status for failure.
634 int acpi_bus_register_driver(struct acpi_driver
*driver
)
640 driver
->drv
.name
= driver
->name
;
641 driver
->drv
.bus
= &acpi_bus_type
;
642 driver
->drv
.owner
= driver
->owner
;
644 ret
= driver_register(&driver
->drv
);
648 EXPORT_SYMBOL(acpi_bus_register_driver
);
651 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
652 * @driver: driver to unregister
654 * Unregisters a driver with the ACPI bus. Searches the namespace for all
655 * devices that match the driver's criteria and unbinds.
657 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
659 driver_unregister(&driver
->drv
);
662 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
664 /* --------------------------------------------------------------------------
666 -------------------------------------------------------------------------- */
668 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
672 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
673 union acpi_object
*obj
;
675 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
676 if (ACPI_FAILURE(status
))
679 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
680 if (ACPI_SUCCESS(status
)) {
681 obj
= buffer
.pointer
;
682 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
684 kfree(buffer
.pointer
);
688 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
690 void acpi_bus_data_handler(acpi_handle handle
, void *context
)
698 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
700 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
705 acpi_bus_extract_wakeup_device_power_package(struct acpi_device
*device
,
706 union acpi_object
*package
)
709 union acpi_object
*element
= NULL
;
711 if (!device
|| !package
|| (package
->package
.count
< 2))
712 return AE_BAD_PARAMETER
;
714 element
= &(package
->package
.elements
[0]);
716 return AE_BAD_PARAMETER
;
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
))
723 device
->wakeup
.gpe_device
=
724 element
->package
.elements
[0].reference
.handle
;
725 device
->wakeup
.gpe_number
=
726 (u32
) element
->package
.elements
[1].integer
.value
;
727 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
728 device
->wakeup
.gpe_number
= element
->integer
.value
;
732 element
= &(package
->package
.elements
[1]);
733 if (element
->type
!= ACPI_TYPE_INTEGER
) {
736 device
->wakeup
.sleep_state
= element
->integer
.value
;
738 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
741 device
->wakeup
.resources
.count
= package
->package
.count
- 2;
742 for (i
= 0; i
< device
->wakeup
.resources
.count
; i
++) {
743 element
= &(package
->package
.elements
[i
+ 2]);
744 if (element
->type
!= ACPI_TYPE_LOCAL_REFERENCE
)
747 device
->wakeup
.resources
.handles
[i
] = element
->reference
.handle
;
753 static int acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
755 acpi_status status
= 0;
756 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
757 union acpi_object
*package
= NULL
;
760 struct acpi_device_id button_device_ids
[] = {
768 status
= acpi_evaluate_object(device
->handle
, "_PRW", NULL
, &buffer
);
769 if (ACPI_FAILURE(status
)) {
770 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
774 package
= (union acpi_object
*)buffer
.pointer
;
775 status
= acpi_bus_extract_wakeup_device_power_package(device
, package
);
776 if (ACPI_FAILURE(status
)) {
777 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
781 kfree(buffer
.pointer
);
783 device
->wakeup
.flags
.valid
= 1;
784 device
->wakeup
.prepare_count
= 0;
785 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
786 * system for the ACPI device with the _PRW object.
787 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
788 * So it is necessary to call _DSW object first. Only when it is not
789 * present will the _PSW object used.
791 psw_error
= acpi_device_sleep_wake(device
, 0, 0, 0);
793 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
794 "error in _DSW or _PSW evaluation\n"));
796 /* Power button, Lid switch always enable wakeup */
797 if (!acpi_match_device_ids(device
, button_device_ids
))
798 device
->wakeup
.flags
.run_wake
= 1;
801 if (ACPI_FAILURE(status
))
802 device
->flags
.wake_capable
= 0;
806 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
808 acpi_status status
= 0;
809 acpi_handle handle
= NULL
;
814 * Power Management Flags
816 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
817 if (ACPI_SUCCESS(status
))
818 device
->power
.flags
.explicit_get
= 1;
819 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
820 if (ACPI_SUCCESS(status
))
821 device
->power
.flags
.inrush_current
= 1;
824 * Enumerate supported power management states
826 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3
; i
++) {
827 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
828 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
830 /* Evaluate "_PRx" to se if power resources are referenced */
831 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
833 if (ps
->resources
.count
) {
834 device
->power
.flags
.power_resources
= 1;
838 /* Evaluate "_PSx" to see if we can do explicit sets */
839 object_name
[2] = 'S';
840 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
841 if (ACPI_SUCCESS(status
)) {
842 ps
->flags
.explicit_set
= 1;
846 /* State is valid if we have some power control */
847 if (ps
->resources
.count
|| ps
->flags
.explicit_set
)
850 ps
->power
= -1; /* Unknown - driver assigned */
851 ps
->latency
= -1; /* Unknown - driver assigned */
854 /* Set defaults for D0 and D3 states (always valid) */
855 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
856 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
857 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
858 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
860 /* TBD: System wake support and resource requirements. */
862 device
->power
.state
= ACPI_STATE_UNKNOWN
;
863 acpi_bus_get_power(device
->handle
, &(device
->power
.state
));
868 static int acpi_bus_get_flags(struct acpi_device
*device
)
870 acpi_status status
= AE_OK
;
871 acpi_handle temp
= NULL
;
874 /* Presence of _STA indicates 'dynamic_status' */
875 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
876 if (ACPI_SUCCESS(status
))
877 device
->flags
.dynamic_status
= 1;
879 /* Presence of _CID indicates 'compatible_ids' */
880 status
= acpi_get_handle(device
->handle
, "_CID", &temp
);
881 if (ACPI_SUCCESS(status
))
882 device
->flags
.compatible_ids
= 1;
884 /* Presence of _RMV indicates 'removable' */
885 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
886 if (ACPI_SUCCESS(status
))
887 device
->flags
.removable
= 1;
889 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
890 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
891 if (ACPI_SUCCESS(status
))
892 device
->flags
.ejectable
= 1;
894 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
895 if (ACPI_SUCCESS(status
))
896 device
->flags
.ejectable
= 1;
899 /* Presence of _LCK indicates 'lockable' */
900 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
901 if (ACPI_SUCCESS(status
))
902 device
->flags
.lockable
= 1;
904 /* Presence of _PS0|_PR0 indicates 'power manageable' */
905 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
906 if (ACPI_FAILURE(status
))
907 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
908 if (ACPI_SUCCESS(status
))
909 device
->flags
.power_manageable
= 1;
911 /* Presence of _PRW indicates wake capable */
912 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
913 if (ACPI_SUCCESS(status
))
914 device
->flags
.wake_capable
= 1;
916 /* TBD: Performance management */
921 static void acpi_device_get_busid(struct acpi_device
*device
, int type
)
923 char bus_id
[5] = { '?', 0 };
924 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
930 * The device's Bus ID is simply the object name.
931 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
934 case ACPI_BUS_TYPE_SYSTEM
:
935 strcpy(device
->pnp
.bus_id
, "ACPI");
937 case ACPI_BUS_TYPE_POWER_BUTTON
:
938 strcpy(device
->pnp
.bus_id
, "PWRF");
940 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
941 strcpy(device
->pnp
.bus_id
, "SLPF");
944 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
945 /* Clean up trailing underscores (if any) */
946 for (i
= 3; i
> 1; i
--) {
947 if (bus_id
[i
] == '_')
952 strcpy(device
->pnp
.bus_id
, bus_id
);
958 * acpi_bay_match - see if a device is an ejectable driver bay
960 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
961 * then we can safely call it an ejectable drive bay
963 static int acpi_bay_match(struct acpi_device
*device
){
969 handle
= device
->handle
;
971 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
972 if (ACPI_FAILURE(status
))
975 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
976 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
977 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
978 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
981 if (acpi_get_parent(handle
, &phandle
))
984 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
985 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
986 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
987 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
994 * acpi_dock_match - see if a device has a _DCK method
996 static int acpi_dock_match(struct acpi_device
*device
)
999 return acpi_get_handle(device
->handle
, "_DCK", &tmp
);
1002 static struct acpica_device_id_list
*
1004 struct acpi_device_info
*info
,
1005 struct acpica_device_id
*new_cid
)
1007 struct acpica_device_id_list
*cid
;
1008 char *next_id_string
;
1009 acpi_size cid_length
;
1010 acpi_size new_cid_length
;
1014 /* Allocate new CID list with room for the new CID */
1017 new_cid_length
= info
->compatible_id_list
.list_size
;
1018 else if (info
->compatible_id_list
.list_size
)
1019 new_cid_length
= info
->compatible_id_list
.list_size
+
1020 new_cid
->length
+ sizeof(struct acpica_device_id
);
1022 new_cid_length
= sizeof(struct acpica_device_id_list
) + new_cid
->length
;
1024 cid
= ACPI_ALLOCATE_ZEROED(new_cid_length
);
1029 cid
->list_size
= new_cid_length
;
1030 cid
->count
= info
->compatible_id_list
.count
;
1033 next_id_string
= (char *) cid
->ids
+ (cid
->count
* sizeof(struct acpica_device_id
));
1035 /* Copy all existing CIDs */
1037 for (i
= 0; i
< info
->compatible_id_list
.count
; i
++) {
1038 cid_length
= info
->compatible_id_list
.ids
[i
].length
;
1039 cid
->ids
[i
].string
= next_id_string
;
1040 cid
->ids
[i
].length
= cid_length
;
1042 ACPI_MEMCPY(next_id_string
, info
->compatible_id_list
.ids
[i
].string
,
1045 next_id_string
+= cid_length
;
1048 /* Append the new CID */
1051 cid
->ids
[i
].string
= next_id_string
;
1052 cid
->ids
[i
].length
= new_cid
->length
;
1054 ACPI_MEMCPY(next_id_string
, new_cid
->string
, new_cid
->length
);
1060 static void acpi_device_set_id(struct acpi_device
*device
, int type
)
1062 struct acpi_device_info
*info
= NULL
;
1065 struct acpica_device_id_list
*cid_list
= NULL
;
1066 char *cid_add
= NULL
;
1070 case ACPI_BUS_TYPE_DEVICE
:
1071 status
= acpi_get_object_info(device
->handle
, &info
);
1072 if (ACPI_FAILURE(status
)) {
1073 printk(KERN_ERR PREFIX
"%s: Error reading device info\n", __func__
);
1077 if (info
->valid
& ACPI_VALID_HID
)
1078 hid
= info
->hardware_id
.string
;
1079 if (info
->valid
& ACPI_VALID_UID
)
1080 uid
= info
->unique_id
.string
;
1081 if (info
->valid
& ACPI_VALID_CID
)
1082 cid_list
= &info
->compatible_id_list
;
1083 if (info
->valid
& ACPI_VALID_ADR
) {
1084 device
->pnp
.bus_address
= info
->address
;
1085 device
->flags
.bus_address
= 1;
1088 /* If we have a video/bay/dock device, add our selfdefined
1089 HID to the CID list. Like that the video/bay/dock drivers
1090 will get autoloaded and the device might still match
1091 against another driver.
1093 if (acpi_is_video_device(device
))
1094 cid_add
= ACPI_VIDEO_HID
;
1095 else if (ACPI_SUCCESS(acpi_bay_match(device
)))
1096 cid_add
= ACPI_BAY_HID
;
1097 else if (ACPI_SUCCESS(acpi_dock_match(device
)))
1098 cid_add
= ACPI_DOCK_HID
;
1101 case ACPI_BUS_TYPE_POWER
:
1102 hid
= ACPI_POWER_HID
;
1104 case ACPI_BUS_TYPE_PROCESSOR
:
1105 hid
= ACPI_PROCESSOR_OBJECT_HID
;
1107 case ACPI_BUS_TYPE_SYSTEM
:
1108 hid
= ACPI_SYSTEM_HID
;
1110 case ACPI_BUS_TYPE_THERMAL
:
1111 hid
= ACPI_THERMAL_HID
;
1113 case ACPI_BUS_TYPE_POWER_BUTTON
:
1114 hid
= ACPI_BUTTON_HID_POWERF
;
1116 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1117 hid
= ACPI_BUTTON_HID_SLEEPF
;
1124 * Fix for the system root bus device -- the only root-level device.
1126 if (((acpi_handle
)device
->parent
== ACPI_ROOT_OBJECT
) &&
1127 (type
== ACPI_BUS_TYPE_DEVICE
)) {
1129 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1130 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1134 device
->pnp
.hardware_id
= ACPI_ALLOCATE_ZEROED(strlen (hid
) + 1);
1135 if (device
->pnp
.hardware_id
) {
1136 strcpy(device
->pnp
.hardware_id
, hid
);
1137 device
->flags
.hardware_id
= 1;
1140 if (!device
->flags
.hardware_id
)
1141 device
->pnp
.hardware_id
= "";
1144 device
->pnp
.unique_id
= ACPI_ALLOCATE_ZEROED(strlen (uid
) + 1);
1145 if (device
->pnp
.unique_id
) {
1146 strcpy(device
->pnp
.unique_id
, uid
);
1147 device
->flags
.unique_id
= 1;
1150 if (!device
->flags
.unique_id
)
1151 device
->pnp
.unique_id
= "";
1153 if (cid_list
|| cid_add
) {
1154 struct acpica_device_id_list
*list
;
1157 struct acpica_device_id cid
;
1158 cid
.length
= strlen (cid_add
) + 1;
1159 cid
.string
= cid_add
;
1161 list
= acpi_add_cid(info
, &cid
);
1163 list
= acpi_add_cid(info
, NULL
);
1167 device
->pnp
.cid_list
= list
;
1169 device
->flags
.compatible_ids
= 1;
1176 static int acpi_device_set_context(struct acpi_device
*device
, int type
)
1178 acpi_status status
= AE_OK
;
1183 * Attach this 'struct acpi_device' to the ACPI object. This makes
1184 * resolutions from handle->device very efficient. Note that we need
1185 * to be careful with fixed-feature devices as they all attach to the
1188 if (type
!= ACPI_BUS_TYPE_POWER_BUTTON
&&
1189 type
!= ACPI_BUS_TYPE_SLEEP_BUTTON
) {
1190 status
= acpi_attach_data(device
->handle
,
1191 acpi_bus_data_handler
, device
);
1193 if (ACPI_FAILURE(status
)) {
1194 printk(KERN_ERR PREFIX
"Error attaching device data\n");
1201 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
1206 dev
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1207 device_release_driver(&dev
->dev
);
1213 * unbind _ADR-Based Devices when hot removal
1215 if (dev
->flags
.bus_address
) {
1216 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
1217 dev
->parent
->ops
.unbind(dev
);
1219 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
1225 acpi_add_single_object(struct acpi_device
**child
,
1226 struct acpi_device
*parent
, acpi_handle handle
, int type
,
1227 struct acpi_bus_ops
*ops
)
1230 struct acpi_device
*device
= NULL
;
1231 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1237 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1239 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1243 device
->handle
= handle
;
1244 device
->parent
= parent
;
1245 device
->bus_ops
= *ops
; /* workround for not call .start */
1247 acpi_device_get_busid(device
, type
);
1252 * Get prior to calling acpi_bus_get_status() so we know whether
1253 * or not _STA is present. Note that we only look for object
1254 * handles -- cannot evaluate objects until we know the device is
1255 * present and properly initialized.
1257 result
= acpi_bus_get_flags(device
);
1264 * See if the device is present. We always assume that non-Device
1265 * and non-Processor objects (e.g. thermal zones, power resources,
1266 * etc.) are present, functioning, etc. (at least when parent object
1267 * is present). Note that _STA has a different meaning for some
1268 * objects (e.g. power resources) so we need to be careful how we use
1272 case ACPI_BUS_TYPE_PROCESSOR
:
1273 case ACPI_BUS_TYPE_DEVICE
:
1274 result
= acpi_bus_get_status(device
);
1275 if (ACPI_FAILURE(result
)) {
1280 * When the device is neither present nor functional, the
1281 * device should not be added to Linux ACPI device tree.
1282 * When the status of the device is not present but functinal,
1283 * it should be added to Linux ACPI tree. For example : bay
1284 * device , dock device.
1285 * In such conditions it is unncessary to check whether it is
1286 * bay device or dock device.
1288 if (!device
->status
.present
&& !device
->status
.functional
) {
1294 STRUCT_TO_INT(device
->status
) =
1295 ACPI_STA_DEVICE_PRESENT
| ACPI_STA_DEVICE_ENABLED
|
1296 ACPI_STA_DEVICE_UI
| ACPI_STA_DEVICE_FUNCTIONING
;
1303 * TBD: Synch with Core's enumeration/initialization process.
1307 * Hardware ID, Unique ID, & Bus Address
1308 * -------------------------------------
1310 acpi_device_set_id(device
, type
);
1316 if (device
->flags
.power_manageable
) {
1317 result
= acpi_bus_get_power_flags(device
);
1323 * Wakeup device management
1324 *-----------------------
1326 if (device
->flags
.wake_capable
) {
1327 result
= acpi_bus_get_wakeup_device_flags(device
);
1333 * Performance Management
1334 * ----------------------
1336 if (device
->flags
.performance_manageable
) {
1337 result
= acpi_bus_get_perf_flags(device
);
1342 if ((result
= acpi_device_set_context(device
, type
)))
1345 result
= acpi_device_register(device
);
1348 * Bind _ADR-Based Devices when hot add
1350 if (device
->flags
.bus_address
) {
1351 if (device
->parent
&& device
->parent
->ops
.bind
)
1352 device
->parent
->ops
.bind(device
);
1357 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1358 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1359 "Adding %s [%s] parent %s\n", dev_name(&device
->dev
),
1360 (char *) buffer
.pointer
,
1361 device
->parent
? dev_name(&device
->parent
->dev
) :
1363 kfree(buffer
.pointer
);
1366 acpi_device_release(&device
->dev
);
1371 static int acpi_bus_scan(struct acpi_device
*start
, struct acpi_bus_ops
*ops
)
1373 acpi_status status
= AE_OK
;
1374 struct acpi_device
*parent
= NULL
;
1375 struct acpi_device
*child
= NULL
;
1376 acpi_handle phandle
= NULL
;
1377 acpi_handle chandle
= NULL
;
1378 acpi_object_type type
= 0;
1386 phandle
= start
->handle
;
1389 * Parse through the ACPI namespace, identify all 'devices', and
1390 * create a new 'struct acpi_device' for each.
1392 while ((level
> 0) && parent
) {
1394 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1398 * If this scope is exhausted then move our way back up.
1400 if (ACPI_FAILURE(status
)) {
1403 acpi_get_parent(phandle
, &phandle
);
1405 parent
= parent
->parent
;
1409 status
= acpi_get_type(chandle
, &type
);
1410 if (ACPI_FAILURE(status
))
1414 * If this is a scope object then parse it (depth-first).
1416 if (type
== ACPI_TYPE_LOCAL_SCOPE
) {
1424 * We're only interested in objects that we consider 'devices'.
1427 case ACPI_TYPE_DEVICE
:
1428 type
= ACPI_BUS_TYPE_DEVICE
;
1430 case ACPI_TYPE_PROCESSOR
:
1431 type
= ACPI_BUS_TYPE_PROCESSOR
;
1433 case ACPI_TYPE_THERMAL
:
1434 type
= ACPI_BUS_TYPE_THERMAL
;
1436 case ACPI_TYPE_POWER
:
1437 type
= ACPI_BUS_TYPE_POWER
;
1443 if (ops
->acpi_op_add
)
1444 status
= acpi_add_single_object(&child
, parent
,
1445 chandle
, type
, ops
);
1447 status
= acpi_bus_get_device(chandle
, &child
);
1449 if (ACPI_FAILURE(status
))
1452 if (ops
->acpi_op_start
&& !(ops
->acpi_op_add
)) {
1453 status
= acpi_start_single_object(child
);
1454 if (ACPI_FAILURE(status
))
1459 * If the device is present, enabled, and functioning then
1460 * parse its scope (depth-first). Note that we need to
1461 * represent absent devices to facilitate PnP notifications
1462 * -- but only the subtree head (not all of its children,
1463 * which will be enumerated when the parent is inserted).
1465 * TBD: Need notifications and other detection mechanisms
1466 * in place before we can fully implement this.
1469 * When the device is not present but functional, it is also
1470 * necessary to scan the children of this device.
1472 if (child
->status
.present
|| (!child
->status
.present
&&
1473 child
->status
.functional
)) {
1474 status
= acpi_get_next_object(ACPI_TYPE_ANY
, chandle
,
1476 if (ACPI_SUCCESS(status
)) {
1489 acpi_bus_add(struct acpi_device
**child
,
1490 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1493 struct acpi_bus_ops ops
;
1495 memset(&ops
, 0, sizeof(ops
));
1496 ops
.acpi_op_add
= 1;
1498 result
= acpi_add_single_object(child
, parent
, handle
, type
, &ops
);
1500 result
= acpi_bus_scan(*child
, &ops
);
1504 EXPORT_SYMBOL(acpi_bus_add
);
1506 int acpi_bus_start(struct acpi_device
*device
)
1509 struct acpi_bus_ops ops
;
1515 result
= acpi_start_single_object(device
);
1517 memset(&ops
, 0, sizeof(ops
));
1518 ops
.acpi_op_start
= 1;
1519 result
= acpi_bus_scan(device
, &ops
);
1523 EXPORT_SYMBOL(acpi_bus_start
);
1525 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1528 struct acpi_device
*parent
, *child
;
1529 acpi_handle phandle
, chandle
;
1530 acpi_object_type type
;
1535 phandle
= start
->handle
;
1536 child
= chandle
= NULL
;
1538 while ((level
> 0) && parent
&& (!err
)) {
1539 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1543 * If this scope is exhausted then move our way back up.
1545 if (ACPI_FAILURE(status
)) {
1548 acpi_get_parent(phandle
, &phandle
);
1550 parent
= parent
->parent
;
1553 err
= acpi_bus_remove(child
, rmdevice
);
1555 err
= acpi_bus_remove(child
, 1);
1560 status
= acpi_get_type(chandle
, &type
);
1561 if (ACPI_FAILURE(status
)) {
1565 * If there is a device corresponding to chandle then
1566 * parse it (depth-first).
1568 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1578 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1580 static int acpi_bus_scan_fixed(void)
1583 struct acpi_device
*device
= NULL
;
1584 struct acpi_bus_ops ops
;
1586 memset(&ops
, 0, sizeof(ops
));
1587 ops
.acpi_op_add
= 1;
1588 ops
.acpi_op_start
= 1;
1591 * Enumerate all fixed-feature devices.
1593 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1594 result
= acpi_add_single_object(&device
, acpi_root
,
1596 ACPI_BUS_TYPE_POWER_BUTTON
,
1600 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1601 result
= acpi_add_single_object(&device
, acpi_root
,
1603 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1610 int __init
acpi_scan_init(void)
1613 struct acpi_bus_ops ops
;
1615 memset(&ops
, 0, sizeof(ops
));
1616 ops
.acpi_op_add
= 1;
1617 ops
.acpi_op_start
= 1;
1619 result
= bus_register(&acpi_bus_type
);
1621 /* We don't want to quit even if we failed to add suspend/resume */
1622 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1626 * Create the root device in the bus's device tree
1628 result
= acpi_add_single_object(&acpi_root
, NULL
, ACPI_ROOT_OBJECT
,
1629 ACPI_BUS_TYPE_SYSTEM
, &ops
);
1634 * Enumerate devices in the ACPI namespace.
1636 result
= acpi_bus_scan_fixed();
1639 result
= acpi_bus_scan(acpi_root
, &ops
);
1642 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);