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_SPINLOCK(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 acpi_compatible_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
->id
[i
].value
);
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 int 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
))
151 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
152 const char *buf
, size_t count
)
156 acpi_object_type type
= 0;
157 struct acpi_device
*acpi_device
= to_acpi_device(d
);
158 struct task_struct
*task
;
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 /* remove the device in another thread to fix the deadlock issue */
176 task
= kthread_run(acpi_bus_hot_remove_device
,
177 acpi_device
->handle
, "acpi_hot_remove_device");
184 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
187 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
188 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
190 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.hardware_id
);
192 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
195 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
196 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
197 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
200 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
204 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
209 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
211 static int acpi_device_setup_files(struct acpi_device
*dev
)
218 * Devices gotten from FADT don't have a "path" attribute
221 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
226 if(dev
->flags
.hardware_id
) {
227 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
232 if (dev
->flags
.hardware_id
|| dev
->flags
.compatible_ids
){
233 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
239 * If device has _EJ0, 'eject' file is created that is used to trigger
240 * hot-removal function from userland.
242 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
243 if (ACPI_SUCCESS(status
))
244 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
249 static void acpi_device_remove_files(struct acpi_device
*dev
)
255 * If device has _EJ0, 'eject' file is created that is used to trigger
256 * hot-removal function from userland.
258 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
259 if (ACPI_SUCCESS(status
))
260 device_remove_file(&dev
->dev
, &dev_attr_eject
);
262 if (dev
->flags
.hardware_id
|| dev
->flags
.compatible_ids
)
263 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
265 if(dev
->flags
.hardware_id
)
266 device_remove_file(&dev
->dev
, &dev_attr_hid
);
268 device_remove_file(&dev
->dev
, &dev_attr_path
);
270 /* --------------------------------------------------------------------------
272 -------------------------------------------------------------------------- */
274 int acpi_match_device_ids(struct acpi_device
*device
,
275 const struct acpi_device_id
*ids
)
277 const struct acpi_device_id
*id
;
280 * If the device is not present, it is unnecessary to load device
283 if (!device
->status
.present
)
286 if (device
->flags
.hardware_id
) {
287 for (id
= ids
; id
->id
[0]; id
++) {
288 if (!strcmp((char*)id
->id
, device
->pnp
.hardware_id
))
293 if (device
->flags
.compatible_ids
) {
294 struct acpi_compatible_id_list
*cid_list
= device
->pnp
.cid_list
;
297 for (id
= ids
; id
->id
[0]; id
++) {
298 /* compare multiple _CID entries against driver ids */
299 for (i
= 0; i
< cid_list
->count
; i
++) {
300 if (!strcmp((char*)id
->id
,
301 cid_list
->id
[i
].value
))
309 EXPORT_SYMBOL(acpi_match_device_ids
);
311 static void acpi_device_release(struct device
*dev
)
313 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
315 kfree(acpi_dev
->pnp
.cid_list
);
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 acpi_device_notify(device
->handle
, ACPI_FIXED_HARDWARE_EVENT
, device
);
377 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
382 hid
= acpi_device_hid(device
);
383 if (!strcmp(hid
, ACPI_BUTTON_HID_POWERF
))
385 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
386 acpi_device_notify_fixed
,
388 else if (!strcmp(hid
, ACPI_BUTTON_HID_SLEEPF
))
390 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
391 acpi_device_notify_fixed
,
394 status
= acpi_install_notify_handler(device
->handle
,
399 if (ACPI_FAILURE(status
))
404 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
406 if (!strcmp(acpi_device_hid(device
), ACPI_BUTTON_HID_POWERF
))
407 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
408 acpi_device_notify_fixed
);
409 else if (!strcmp(acpi_device_hid(device
), ACPI_BUTTON_HID_SLEEPF
))
410 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
411 acpi_device_notify_fixed
);
413 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
417 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
418 static int acpi_start_single_object(struct acpi_device
*);
419 static int acpi_device_probe(struct device
* dev
)
421 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
422 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
425 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
427 if (acpi_dev
->bus_ops
.acpi_op_start
)
428 acpi_start_single_object(acpi_dev
);
430 if (acpi_drv
->ops
.notify
) {
431 ret
= acpi_device_install_notify_handler(acpi_dev
);
433 if (acpi_drv
->ops
.stop
)
434 acpi_drv
->ops
.stop(acpi_dev
,
435 acpi_dev
->removal_type
);
436 if (acpi_drv
->ops
.remove
)
437 acpi_drv
->ops
.remove(acpi_dev
,
438 acpi_dev
->removal_type
);
443 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
444 "Found driver [%s] for device [%s]\n",
445 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
451 static int acpi_device_remove(struct device
* dev
)
453 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
454 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
457 if (acpi_drv
->ops
.notify
)
458 acpi_device_remove_notify_handler(acpi_dev
);
459 if (acpi_drv
->ops
.stop
)
460 acpi_drv
->ops
.stop(acpi_dev
, acpi_dev
->removal_type
);
461 if (acpi_drv
->ops
.remove
)
462 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
464 acpi_dev
->driver
= NULL
;
465 acpi_dev
->driver_data
= NULL
;
471 struct bus_type acpi_bus_type
= {
473 .suspend
= acpi_device_suspend
,
474 .resume
= acpi_device_resume
,
475 .match
= acpi_bus_match
,
476 .probe
= acpi_device_probe
,
477 .remove
= acpi_device_remove
,
478 .uevent
= acpi_device_uevent
,
481 static int acpi_device_register(struct acpi_device
*device
,
482 struct acpi_device
*parent
)
485 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
490 * Link this device to its parent and siblings.
492 INIT_LIST_HEAD(&device
->children
);
493 INIT_LIST_HEAD(&device
->node
);
494 INIT_LIST_HEAD(&device
->g_list
);
495 INIT_LIST_HEAD(&device
->wakeup_list
);
497 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
499 printk(KERN_ERR PREFIX
"Memory allocation error\n");
503 spin_lock(&acpi_device_lock
);
505 * Find suitable bus_id and instance number in acpi_bus_id_list
506 * If failed, create one and link it into acpi_bus_id_list
508 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
509 if(!strcmp(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device")) {
510 acpi_device_bus_id
->instance_no
++;
517 acpi_device_bus_id
= new_bus_id
;
518 strcpy(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device");
519 acpi_device_bus_id
->instance_no
= 0;
520 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
522 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
524 if (device
->parent
) {
525 list_add_tail(&device
->node
, &device
->parent
->children
);
526 list_add_tail(&device
->g_list
, &device
->parent
->g_list
);
528 list_add_tail(&device
->g_list
, &acpi_device_list
);
529 if (device
->wakeup
.flags
.valid
)
530 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
531 spin_unlock(&acpi_device_lock
);
534 device
->dev
.parent
= &parent
->dev
;
535 device
->dev
.bus
= &acpi_bus_type
;
536 device_initialize(&device
->dev
);
537 device
->dev
.release
= &acpi_device_release
;
538 result
= device_add(&device
->dev
);
540 dev_err(&device
->dev
, "Error adding device\n");
544 result
= acpi_device_setup_files(device
);
546 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
547 dev_name(&device
->dev
));
549 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
552 spin_lock(&acpi_device_lock
);
553 if (device
->parent
) {
554 list_del(&device
->node
);
555 list_del(&device
->g_list
);
557 list_del(&device
->g_list
);
558 list_del(&device
->wakeup_list
);
559 spin_unlock(&acpi_device_lock
);
563 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
565 spin_lock(&acpi_device_lock
);
566 if (device
->parent
) {
567 list_del(&device
->node
);
568 list_del(&device
->g_list
);
570 list_del(&device
->g_list
);
572 list_del(&device
->wakeup_list
);
573 spin_unlock(&acpi_device_lock
);
575 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
577 acpi_device_remove_files(device
);
578 device_unregister(&device
->dev
);
581 /* --------------------------------------------------------------------------
583 -------------------------------------------------------------------------- */
585 * acpi_bus_driver_init - add a device to a driver
586 * @device: the device to add and initialize
587 * @driver: driver for the device
589 * Used to initialize a device via its device driver. Called whenever a
590 * driver is bound to a device. Invokes the driver's add() ops.
593 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
598 if (!device
|| !driver
)
601 if (!driver
->ops
.add
)
604 result
= driver
->ops
.add(device
);
606 device
->driver
= NULL
;
607 device
->driver_data
= NULL
;
611 device
->driver
= driver
;
614 * TBD - Configuration Management: Assign resources to device based
615 * upon possible configuration and currently allocated resources.
618 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
619 "Driver successfully bound to device\n"));
623 static int acpi_start_single_object(struct acpi_device
*device
)
626 struct acpi_driver
*driver
;
629 if (!(driver
= device
->driver
))
632 if (driver
->ops
.start
) {
633 result
= driver
->ops
.start(device
);
634 if (result
&& driver
->ops
.remove
)
635 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
642 * acpi_bus_register_driver - register a driver with the ACPI bus
643 * @driver: driver being registered
645 * Registers a driver with the ACPI bus. Searches the namespace for all
646 * devices that match the driver's criteria and binds. Returns zero for
647 * success or a negative error status for failure.
649 int acpi_bus_register_driver(struct acpi_driver
*driver
)
655 driver
->drv
.name
= driver
->name
;
656 driver
->drv
.bus
= &acpi_bus_type
;
657 driver
->drv
.owner
= driver
->owner
;
659 ret
= driver_register(&driver
->drv
);
663 EXPORT_SYMBOL(acpi_bus_register_driver
);
666 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
667 * @driver: driver to unregister
669 * Unregisters a driver with the ACPI bus. Searches the namespace for all
670 * devices that match the driver's criteria and unbinds.
672 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
674 driver_unregister(&driver
->drv
);
677 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
679 /* --------------------------------------------------------------------------
681 -------------------------------------------------------------------------- */
683 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
687 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
688 union acpi_object
*obj
;
690 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
691 if (ACPI_FAILURE(status
))
694 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
695 if (ACPI_SUCCESS(status
)) {
696 obj
= buffer
.pointer
;
697 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
699 kfree(buffer
.pointer
);
703 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
705 void acpi_bus_data_handler(acpi_handle handle
, u32 function
, void *context
)
713 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
715 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
720 acpi_bus_extract_wakeup_device_power_package(struct acpi_device
*device
,
721 union acpi_object
*package
)
724 union acpi_object
*element
= NULL
;
726 if (!device
|| !package
|| (package
->package
.count
< 2))
727 return AE_BAD_PARAMETER
;
729 element
= &(package
->package
.elements
[0]);
731 return AE_BAD_PARAMETER
;
732 if (element
->type
== ACPI_TYPE_PACKAGE
) {
733 if ((element
->package
.count
< 2) ||
734 (element
->package
.elements
[0].type
!=
735 ACPI_TYPE_LOCAL_REFERENCE
)
736 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
738 device
->wakeup
.gpe_device
=
739 element
->package
.elements
[0].reference
.handle
;
740 device
->wakeup
.gpe_number
=
741 (u32
) element
->package
.elements
[1].integer
.value
;
742 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
743 device
->wakeup
.gpe_number
= element
->integer
.value
;
747 element
= &(package
->package
.elements
[1]);
748 if (element
->type
!= ACPI_TYPE_INTEGER
) {
751 device
->wakeup
.sleep_state
= element
->integer
.value
;
753 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
756 device
->wakeup
.resources
.count
= package
->package
.count
- 2;
757 for (i
= 0; i
< device
->wakeup
.resources
.count
; i
++) {
758 element
= &(package
->package
.elements
[i
+ 2]);
759 if (element
->type
!= ACPI_TYPE_LOCAL_REFERENCE
)
762 device
->wakeup
.resources
.handles
[i
] = element
->reference
.handle
;
768 static int acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
770 acpi_status status
= 0;
771 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
772 union acpi_object
*package
= NULL
;
775 struct acpi_device_id button_device_ids
[] = {
783 status
= acpi_evaluate_object(device
->handle
, "_PRW", NULL
, &buffer
);
784 if (ACPI_FAILURE(status
)) {
785 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
789 package
= (union acpi_object
*)buffer
.pointer
;
790 status
= acpi_bus_extract_wakeup_device_power_package(device
, package
);
791 if (ACPI_FAILURE(status
)) {
792 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
796 kfree(buffer
.pointer
);
798 device
->wakeup
.flags
.valid
= 1;
799 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
800 * system for the ACPI device with the _PRW object.
801 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
802 * So it is necessary to call _DSW object first. Only when it is not
803 * present will the _PSW object used.
805 psw_error
= acpi_device_sleep_wake(device
, 0, 0, 0);
807 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
808 "error in _DSW or _PSW evaluation\n"));
810 /* Power button, Lid switch always enable wakeup */
811 if (!acpi_match_device_ids(device
, button_device_ids
))
812 device
->wakeup
.flags
.run_wake
= 1;
815 if (ACPI_FAILURE(status
))
816 device
->flags
.wake_capable
= 0;
820 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
822 acpi_status status
= 0;
823 acpi_handle handle
= NULL
;
828 * Power Management Flags
830 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
831 if (ACPI_SUCCESS(status
))
832 device
->power
.flags
.explicit_get
= 1;
833 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
834 if (ACPI_SUCCESS(status
))
835 device
->power
.flags
.inrush_current
= 1;
838 * Enumerate supported power management states
840 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3
; i
++) {
841 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
842 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
844 /* Evaluate "_PRx" to se if power resources are referenced */
845 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
847 if (ps
->resources
.count
) {
848 device
->power
.flags
.power_resources
= 1;
852 /* Evaluate "_PSx" to see if we can do explicit sets */
853 object_name
[2] = 'S';
854 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
855 if (ACPI_SUCCESS(status
)) {
856 ps
->flags
.explicit_set
= 1;
860 /* State is valid if we have some power control */
861 if (ps
->resources
.count
|| ps
->flags
.explicit_set
)
864 ps
->power
= -1; /* Unknown - driver assigned */
865 ps
->latency
= -1; /* Unknown - driver assigned */
868 /* Set defaults for D0 and D3 states (always valid) */
869 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
870 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
871 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
872 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
874 /* TBD: System wake support and resource requirements. */
876 device
->power
.state
= ACPI_STATE_UNKNOWN
;
877 acpi_bus_get_power(device
->handle
, &(device
->power
.state
));
882 static int acpi_bus_get_flags(struct acpi_device
*device
)
884 acpi_status status
= AE_OK
;
885 acpi_handle temp
= NULL
;
888 /* Presence of _STA indicates 'dynamic_status' */
889 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
890 if (ACPI_SUCCESS(status
))
891 device
->flags
.dynamic_status
= 1;
893 /* Presence of _CID indicates 'compatible_ids' */
894 status
= acpi_get_handle(device
->handle
, "_CID", &temp
);
895 if (ACPI_SUCCESS(status
))
896 device
->flags
.compatible_ids
= 1;
898 /* Presence of _RMV indicates 'removable' */
899 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
900 if (ACPI_SUCCESS(status
))
901 device
->flags
.removable
= 1;
903 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
904 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
905 if (ACPI_SUCCESS(status
))
906 device
->flags
.ejectable
= 1;
908 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
909 if (ACPI_SUCCESS(status
))
910 device
->flags
.ejectable
= 1;
913 /* Presence of _LCK indicates 'lockable' */
914 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
915 if (ACPI_SUCCESS(status
))
916 device
->flags
.lockable
= 1;
918 /* Presence of _PS0|_PR0 indicates 'power manageable' */
919 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
920 if (ACPI_FAILURE(status
))
921 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
922 if (ACPI_SUCCESS(status
))
923 device
->flags
.power_manageable
= 1;
925 /* Presence of _PRW indicates wake capable */
926 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
927 if (ACPI_SUCCESS(status
))
928 device
->flags
.wake_capable
= 1;
930 /* TBD: Performance management */
935 static void acpi_device_get_busid(struct acpi_device
*device
,
936 acpi_handle handle
, int type
)
938 char bus_id
[5] = { '?', 0 };
939 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
945 * The device's Bus ID is simply the object name.
946 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
949 case ACPI_BUS_TYPE_SYSTEM
:
950 strcpy(device
->pnp
.bus_id
, "ACPI");
952 case ACPI_BUS_TYPE_POWER_BUTTON
:
953 strcpy(device
->pnp
.bus_id
, "PWRF");
955 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
956 strcpy(device
->pnp
.bus_id
, "SLPF");
959 acpi_get_name(handle
, ACPI_SINGLE_NAME
, &buffer
);
960 /* Clean up trailing underscores (if any) */
961 for (i
= 3; i
> 1; i
--) {
962 if (bus_id
[i
] == '_')
967 strcpy(device
->pnp
.bus_id
, bus_id
);
973 * acpi_bay_match - see if a device is an ejectable driver bay
975 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
976 * then we can safely call it an ejectable drive bay
978 static int acpi_bay_match(struct acpi_device
*device
){
984 handle
= device
->handle
;
986 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
987 if (ACPI_FAILURE(status
))
990 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
991 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
992 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
993 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
996 if (acpi_get_parent(handle
, &phandle
))
999 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
1000 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
1001 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
1002 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
1009 * acpi_dock_match - see if a device has a _DCK method
1011 static int acpi_dock_match(struct acpi_device
*device
)
1014 return acpi_get_handle(device
->handle
, "_DCK", &tmp
);
1017 static void acpi_device_set_id(struct acpi_device
*device
,
1018 struct acpi_device
*parent
, acpi_handle handle
,
1021 struct acpi_device_info
*info
;
1022 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1025 struct acpi_compatible_id_list
*cid_list
= NULL
;
1026 const char *cid_add
= NULL
;
1030 case ACPI_BUS_TYPE_DEVICE
:
1031 status
= acpi_get_object_info(handle
, &buffer
);
1032 if (ACPI_FAILURE(status
)) {
1033 printk(KERN_ERR PREFIX
"%s: Error reading device info\n", __func__
);
1037 info
= buffer
.pointer
;
1038 if (info
->valid
& ACPI_VALID_HID
)
1039 hid
= info
->hardware_id
.value
;
1040 if (info
->valid
& ACPI_VALID_UID
)
1041 uid
= info
->unique_id
.value
;
1042 if (info
->valid
& ACPI_VALID_CID
)
1043 cid_list
= &info
->compatibility_id
;
1044 if (info
->valid
& ACPI_VALID_ADR
) {
1045 device
->pnp
.bus_address
= info
->address
;
1046 device
->flags
.bus_address
= 1;
1049 /* If we have a video/bay/dock device, add our selfdefined
1050 HID to the CID list. Like that the video/bay/dock drivers
1051 will get autoloaded and the device might still match
1052 against another driver.
1054 if (acpi_is_video_device(device
))
1055 cid_add
= ACPI_VIDEO_HID
;
1056 else if (ACPI_SUCCESS(acpi_bay_match(device
)))
1057 cid_add
= ACPI_BAY_HID
;
1058 else if (ACPI_SUCCESS(acpi_dock_match(device
)))
1059 cid_add
= ACPI_DOCK_HID
;
1062 case ACPI_BUS_TYPE_POWER
:
1063 hid
= ACPI_POWER_HID
;
1065 case ACPI_BUS_TYPE_PROCESSOR
:
1066 hid
= ACPI_PROCESSOR_OBJECT_HID
;
1068 case ACPI_BUS_TYPE_SYSTEM
:
1069 hid
= ACPI_SYSTEM_HID
;
1071 case ACPI_BUS_TYPE_THERMAL
:
1072 hid
= ACPI_THERMAL_HID
;
1074 case ACPI_BUS_TYPE_POWER_BUTTON
:
1075 hid
= ACPI_BUTTON_HID_POWERF
;
1077 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1078 hid
= ACPI_BUTTON_HID_SLEEPF
;
1085 * Fix for the system root bus device -- the only root-level device.
1087 if (((acpi_handle
)parent
== ACPI_ROOT_OBJECT
) && (type
== ACPI_BUS_TYPE_DEVICE
)) {
1089 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1090 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1094 strcpy(device
->pnp
.hardware_id
, hid
);
1095 device
->flags
.hardware_id
= 1;
1098 strcpy(device
->pnp
.unique_id
, uid
);
1099 device
->flags
.unique_id
= 1;
1101 if (cid_list
|| cid_add
) {
1102 struct acpi_compatible_id_list
*list
;
1107 size
= cid_list
->size
;
1108 } else if (cid_add
) {
1109 size
= sizeof(struct acpi_compatible_id_list
);
1110 cid_list
= ACPI_ALLOCATE_ZEROED((acpi_size
) size
);
1112 printk(KERN_ERR
"Memory allocation error\n");
1113 kfree(buffer
.pointer
);
1116 cid_list
->count
= 0;
1117 cid_list
->size
= size
;
1121 size
+= sizeof(struct acpi_compatible_id
);
1122 list
= kmalloc(size
, GFP_KERNEL
);
1126 memcpy(list
, cid_list
, cid_list
->size
);
1127 count
= cid_list
->count
;
1130 strncpy(list
->id
[count
].value
, cid_add
,
1131 ACPI_MAX_CID_LENGTH
);
1133 device
->flags
.compatible_ids
= 1;
1136 list
->count
= count
;
1137 device
->pnp
.cid_list
= list
;
1139 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1142 kfree(buffer
.pointer
);
1145 static int acpi_device_set_context(struct acpi_device
*device
, int type
)
1147 acpi_status status
= AE_OK
;
1152 * Attach this 'struct acpi_device' to the ACPI object. This makes
1153 * resolutions from handle->device very efficient. Note that we need
1154 * to be careful with fixed-feature devices as they all attach to the
1157 if (type
!= ACPI_BUS_TYPE_POWER_BUTTON
&&
1158 type
!= ACPI_BUS_TYPE_SLEEP_BUTTON
) {
1159 status
= acpi_attach_data(device
->handle
,
1160 acpi_bus_data_handler
, device
);
1162 if (ACPI_FAILURE(status
)) {
1163 printk(KERN_ERR PREFIX
"Error attaching device data\n");
1170 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
1175 dev
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1176 device_release_driver(&dev
->dev
);
1182 * unbind _ADR-Based Devices when hot removal
1184 if (dev
->flags
.bus_address
) {
1185 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
1186 dev
->parent
->ops
.unbind(dev
);
1188 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
1194 acpi_add_single_object(struct acpi_device
**child
,
1195 struct acpi_device
*parent
, acpi_handle handle
, int type
,
1196 struct acpi_bus_ops
*ops
)
1199 struct acpi_device
*device
= NULL
;
1205 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1207 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1211 device
->handle
= handle
;
1212 device
->parent
= parent
;
1213 device
->bus_ops
= *ops
; /* workround for not call .start */
1216 acpi_device_get_busid(device
, handle
, type
);
1221 * Get prior to calling acpi_bus_get_status() so we know whether
1222 * or not _STA is present. Note that we only look for object
1223 * handles -- cannot evaluate objects until we know the device is
1224 * present and properly initialized.
1226 result
= acpi_bus_get_flags(device
);
1233 * See if the device is present. We always assume that non-Device
1234 * and non-Processor objects (e.g. thermal zones, power resources,
1235 * etc.) are present, functioning, etc. (at least when parent object
1236 * is present). Note that _STA has a different meaning for some
1237 * objects (e.g. power resources) so we need to be careful how we use
1241 case ACPI_BUS_TYPE_PROCESSOR
:
1242 case ACPI_BUS_TYPE_DEVICE
:
1243 result
= acpi_bus_get_status(device
);
1244 if (ACPI_FAILURE(result
)) {
1249 * When the device is neither present nor functional, the
1250 * device should not be added to Linux ACPI device tree.
1251 * When the status of the device is not present but functinal,
1252 * it should be added to Linux ACPI tree. For example : bay
1253 * device , dock device.
1254 * In such conditions it is unncessary to check whether it is
1255 * bay device or dock device.
1257 if (!device
->status
.present
&& !device
->status
.functional
) {
1263 STRUCT_TO_INT(device
->status
) =
1264 ACPI_STA_DEVICE_PRESENT
| ACPI_STA_DEVICE_ENABLED
|
1265 ACPI_STA_DEVICE_UI
| ACPI_STA_DEVICE_FUNCTIONING
;
1272 * TBD: Synch with Core's enumeration/initialization process.
1276 * Hardware ID, Unique ID, & Bus Address
1277 * -------------------------------------
1279 acpi_device_set_id(device
, parent
, handle
, type
);
1282 * The ACPI device is attached to acpi handle before getting
1283 * the power/wakeup/peformance flags. Otherwise OS can't get
1284 * the corresponding ACPI device by the acpi handle in the course
1285 * of getting the power/wakeup/performance flags.
1287 result
= acpi_device_set_context(device
, type
);
1295 if (device
->flags
.power_manageable
) {
1296 result
= acpi_bus_get_power_flags(device
);
1302 * Wakeup device management
1303 *-----------------------
1305 if (device
->flags
.wake_capable
) {
1306 result
= acpi_bus_get_wakeup_device_flags(device
);
1312 * Performance Management
1313 * ----------------------
1315 if (device
->flags
.performance_manageable
) {
1316 result
= acpi_bus_get_perf_flags(device
);
1322 result
= acpi_device_register(device
, parent
);
1325 * Bind _ADR-Based Devices when hot add
1327 if (device
->flags
.bus_address
) {
1328 if (device
->parent
&& device
->parent
->ops
.bind
)
1329 device
->parent
->ops
.bind(device
);
1336 kfree(device
->pnp
.cid_list
);
1343 static int acpi_bus_scan(struct acpi_device
*start
, struct acpi_bus_ops
*ops
)
1345 acpi_status status
= AE_OK
;
1346 struct acpi_device
*parent
= NULL
;
1347 struct acpi_device
*child
= NULL
;
1348 acpi_handle phandle
= NULL
;
1349 acpi_handle chandle
= NULL
;
1350 acpi_object_type type
= 0;
1358 phandle
= start
->handle
;
1361 * Parse through the ACPI namespace, identify all 'devices', and
1362 * create a new 'struct acpi_device' for each.
1364 while ((level
> 0) && parent
) {
1366 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1370 * If this scope is exhausted then move our way back up.
1372 if (ACPI_FAILURE(status
)) {
1375 acpi_get_parent(phandle
, &phandle
);
1377 parent
= parent
->parent
;
1381 status
= acpi_get_type(chandle
, &type
);
1382 if (ACPI_FAILURE(status
))
1386 * If this is a scope object then parse it (depth-first).
1388 if (type
== ACPI_TYPE_LOCAL_SCOPE
) {
1396 * We're only interested in objects that we consider 'devices'.
1399 case ACPI_TYPE_DEVICE
:
1400 type
= ACPI_BUS_TYPE_DEVICE
;
1402 case ACPI_TYPE_PROCESSOR
:
1403 type
= ACPI_BUS_TYPE_PROCESSOR
;
1405 case ACPI_TYPE_THERMAL
:
1406 type
= ACPI_BUS_TYPE_THERMAL
;
1408 case ACPI_TYPE_POWER
:
1409 type
= ACPI_BUS_TYPE_POWER
;
1415 if (ops
->acpi_op_add
)
1416 status
= acpi_add_single_object(&child
, parent
,
1417 chandle
, type
, ops
);
1419 status
= acpi_bus_get_device(chandle
, &child
);
1421 if (ACPI_FAILURE(status
))
1424 if (ops
->acpi_op_start
&& !(ops
->acpi_op_add
)) {
1425 status
= acpi_start_single_object(child
);
1426 if (ACPI_FAILURE(status
))
1431 * If the device is present, enabled, and functioning then
1432 * parse its scope (depth-first). Note that we need to
1433 * represent absent devices to facilitate PnP notifications
1434 * -- but only the subtree head (not all of its children,
1435 * which will be enumerated when the parent is inserted).
1437 * TBD: Need notifications and other detection mechanisms
1438 * in place before we can fully implement this.
1441 * When the device is not present but functional, it is also
1442 * necessary to scan the children of this device.
1444 if (child
->status
.present
|| (!child
->status
.present
&&
1445 child
->status
.functional
)) {
1446 status
= acpi_get_next_object(ACPI_TYPE_ANY
, chandle
,
1448 if (ACPI_SUCCESS(status
)) {
1461 acpi_bus_add(struct acpi_device
**child
,
1462 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1465 struct acpi_bus_ops ops
;
1467 memset(&ops
, 0, sizeof(ops
));
1468 ops
.acpi_op_add
= 1;
1470 result
= acpi_add_single_object(child
, parent
, handle
, type
, &ops
);
1472 result
= acpi_bus_scan(*child
, &ops
);
1477 EXPORT_SYMBOL(acpi_bus_add
);
1479 int acpi_bus_start(struct acpi_device
*device
)
1482 struct acpi_bus_ops ops
;
1488 result
= acpi_start_single_object(device
);
1490 memset(&ops
, 0, sizeof(ops
));
1491 ops
.acpi_op_start
= 1;
1492 result
= acpi_bus_scan(device
, &ops
);
1497 EXPORT_SYMBOL(acpi_bus_start
);
1499 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1502 struct acpi_device
*parent
, *child
;
1503 acpi_handle phandle
, chandle
;
1504 acpi_object_type type
;
1509 phandle
= start
->handle
;
1510 child
= chandle
= NULL
;
1512 while ((level
> 0) && parent
&& (!err
)) {
1513 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1517 * If this scope is exhausted then move our way back up.
1519 if (ACPI_FAILURE(status
)) {
1522 acpi_get_parent(phandle
, &phandle
);
1524 parent
= parent
->parent
;
1527 err
= acpi_bus_remove(child
, rmdevice
);
1529 err
= acpi_bus_remove(child
, 1);
1534 status
= acpi_get_type(chandle
, &type
);
1535 if (ACPI_FAILURE(status
)) {
1539 * If there is a device corresponding to chandle then
1540 * parse it (depth-first).
1542 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1552 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1555 static int acpi_bus_scan_fixed(struct acpi_device
*root
)
1558 struct acpi_device
*device
= NULL
;
1559 struct acpi_bus_ops ops
;
1564 memset(&ops
, 0, sizeof(ops
));
1565 ops
.acpi_op_add
= 1;
1566 ops
.acpi_op_start
= 1;
1569 * Enumerate all fixed-feature devices.
1571 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1572 result
= acpi_add_single_object(&device
, acpi_root
,
1574 ACPI_BUS_TYPE_POWER_BUTTON
,
1578 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1579 result
= acpi_add_single_object(&device
, acpi_root
,
1581 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1588 int __init
acpi_scan_init(void)
1591 struct acpi_bus_ops ops
;
1593 memset(&ops
, 0, sizeof(ops
));
1594 ops
.acpi_op_add
= 1;
1595 ops
.acpi_op_start
= 1;
1597 result
= bus_register(&acpi_bus_type
);
1599 /* We don't want to quit even if we failed to add suspend/resume */
1600 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1604 * Create the root device in the bus's device tree
1606 result
= acpi_add_single_object(&acpi_root
, NULL
, ACPI_ROOT_OBJECT
,
1607 ACPI_BUS_TYPE_SYSTEM
, &ops
);
1612 * Enumerate devices in the ACPI namespace.
1614 result
= acpi_bus_scan_fixed(acpi_root
);
1617 result
= acpi_bus_scan(acpi_root
, &ops
);
1620 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);