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>
13 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
15 #define _COMPONENT ACPI_BUS_COMPONENT
16 ACPI_MODULE_NAME("scan");
17 #define STRUCT_TO_INT(s) (*((int*)&s))
18 extern struct acpi_device
*acpi_root
;
20 #define ACPI_BUS_CLASS "system_bus"
21 #define ACPI_BUS_HID "LNXSYBUS"
22 #define ACPI_BUS_DEVICE_NAME "System Bus"
24 static LIST_HEAD(acpi_device_list
);
25 static LIST_HEAD(acpi_bus_id_list
);
26 DEFINE_SPINLOCK(acpi_device_lock
);
27 LIST_HEAD(acpi_wakeup_device_list
);
29 struct acpi_device_bus_id
{
31 unsigned int instance_no
;
32 struct list_head node
;
36 * Creates hid/cid(s) string needed for modalias and uevent
37 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
38 * char *modalias: "acpi:IBM0001:ACPI0001"
40 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
46 if (!acpi_dev
->flags
.hardware_id
&& !acpi_dev
->flags
.compatible_ids
)
49 len
= snprintf(modalias
, size
, "acpi:");
52 if (acpi_dev
->flags
.hardware_id
) {
53 count
= snprintf(&modalias
[len
], size
, "%s:",
54 acpi_dev
->pnp
.hardware_id
);
55 if (count
< 0 || count
>= size
)
61 if (acpi_dev
->flags
.compatible_ids
) {
62 struct acpi_compatible_id_list
*cid_list
;
65 cid_list
= acpi_dev
->pnp
.cid_list
;
66 for (i
= 0; i
< cid_list
->count
; i
++) {
67 count
= snprintf(&modalias
[len
], size
, "%s:",
68 cid_list
->id
[i
].value
);
69 if (count
< 0 || count
>= size
) {
70 printk(KERN_ERR PREFIX
"%s cid[%i] exceeds event buffer size",
71 acpi_dev
->pnp
.device_name
, i
);
84 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
85 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
88 /* Device has no HID and no CID or string is >1024 */
89 len
= create_modalias(acpi_dev
, buf
, 1024);
95 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
97 static int acpi_bus_hot_remove_device(void *context
)
99 struct acpi_device
*device
;
100 acpi_handle handle
= context
;
101 struct acpi_object_list arg_list
;
102 union acpi_object arg
;
103 acpi_status status
= AE_OK
;
105 if (acpi_bus_get_device(handle
, &device
))
111 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
112 "Hot-removing device %s...\n", device
->dev
.bus_id
));
115 if (acpi_bus_trim(device
, 1)) {
116 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
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 ACPI_DEBUG_PRINT((ACPI_DB_WARN
,
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
;
279 if (device
->flags
.hardware_id
) {
280 for (id
= ids
; id
->id
[0]; id
++) {
281 if (!strcmp((char*)id
->id
, device
->pnp
.hardware_id
))
286 if (device
->flags
.compatible_ids
) {
287 struct acpi_compatible_id_list
*cid_list
= device
->pnp
.cid_list
;
290 for (id
= ids
; id
->id
[0]; id
++) {
291 /* compare multiple _CID entries against driver ids */
292 for (i
= 0; i
< cid_list
->count
; i
++) {
293 if (!strcmp((char*)id
->id
,
294 cid_list
->id
[i
].value
))
302 EXPORT_SYMBOL(acpi_match_device_ids
);
304 static void acpi_device_release(struct device
*dev
)
306 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
308 kfree(acpi_dev
->pnp
.cid_list
);
312 static int acpi_device_suspend(struct device
*dev
, pm_message_t state
)
314 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
315 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
317 if (acpi_drv
&& acpi_drv
->ops
.suspend
)
318 return acpi_drv
->ops
.suspend(acpi_dev
, state
);
322 static int acpi_device_resume(struct device
*dev
)
324 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
325 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
327 if (acpi_drv
&& acpi_drv
->ops
.resume
)
328 return acpi_drv
->ops
.resume(acpi_dev
);
332 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
334 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
335 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
337 return !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
340 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
342 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
345 if (add_uevent_var(env
, "MODALIAS="))
347 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
348 sizeof(env
->buf
) - env
->buflen
);
349 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
355 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
356 static int acpi_start_single_object(struct acpi_device
*);
357 static int acpi_device_probe(struct device
* dev
)
359 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
360 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
363 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
365 if (acpi_dev
->bus_ops
.acpi_op_start
)
366 acpi_start_single_object(acpi_dev
);
367 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
368 "Found driver [%s] for device [%s]\n",
369 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
375 static int acpi_device_remove(struct device
* dev
)
377 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
378 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
381 if (acpi_drv
->ops
.stop
)
382 acpi_drv
->ops
.stop(acpi_dev
, acpi_dev
->removal_type
);
383 if (acpi_drv
->ops
.remove
)
384 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
386 acpi_dev
->driver
= NULL
;
387 acpi_driver_data(dev
) = NULL
;
393 static void acpi_device_shutdown(struct device
*dev
)
395 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
396 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
398 if (acpi_drv
&& acpi_drv
->ops
.shutdown
)
399 acpi_drv
->ops
.shutdown(acpi_dev
);
404 struct bus_type acpi_bus_type
= {
406 .suspend
= acpi_device_suspend
,
407 .resume
= acpi_device_resume
,
408 .shutdown
= acpi_device_shutdown
,
409 .match
= acpi_bus_match
,
410 .probe
= acpi_device_probe
,
411 .remove
= acpi_device_remove
,
412 .uevent
= acpi_device_uevent
,
415 static int acpi_device_register(struct acpi_device
*device
,
416 struct acpi_device
*parent
)
419 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
424 * Link this device to its parent and siblings.
426 INIT_LIST_HEAD(&device
->children
);
427 INIT_LIST_HEAD(&device
->node
);
428 INIT_LIST_HEAD(&device
->g_list
);
429 INIT_LIST_HEAD(&device
->wakeup_list
);
431 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
433 printk(KERN_ERR PREFIX
"Memory allocation error\n");
437 spin_lock(&acpi_device_lock
);
439 * Find suitable bus_id and instance number in acpi_bus_id_list
440 * If failed, create one and link it into acpi_bus_id_list
442 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
443 if(!strcmp(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device")) {
444 acpi_device_bus_id
->instance_no
++;
451 acpi_device_bus_id
= new_bus_id
;
452 strcpy(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device");
453 acpi_device_bus_id
->instance_no
= 0;
454 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
456 sprintf(device
->dev
.bus_id
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
458 if (device
->parent
) {
459 list_add_tail(&device
->node
, &device
->parent
->children
);
460 list_add_tail(&device
->g_list
, &device
->parent
->g_list
);
462 list_add_tail(&device
->g_list
, &acpi_device_list
);
463 if (device
->wakeup
.flags
.valid
)
464 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
465 spin_unlock(&acpi_device_lock
);
468 device
->dev
.parent
= &parent
->dev
;
469 device
->dev
.bus
= &acpi_bus_type
;
470 device_initialize(&device
->dev
);
471 device
->dev
.release
= &acpi_device_release
;
472 result
= device_add(&device
->dev
);
474 dev_err(&device
->dev
, "Error adding device\n");
478 result
= acpi_device_setup_files(device
);
480 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error creating sysfs interface for device %s\n", device
->dev
.bus_id
));
482 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
485 spin_lock(&acpi_device_lock
);
486 if (device
->parent
) {
487 list_del(&device
->node
);
488 list_del(&device
->g_list
);
490 list_del(&device
->g_list
);
491 list_del(&device
->wakeup_list
);
492 spin_unlock(&acpi_device_lock
);
496 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
498 spin_lock(&acpi_device_lock
);
499 if (device
->parent
) {
500 list_del(&device
->node
);
501 list_del(&device
->g_list
);
503 list_del(&device
->g_list
);
505 list_del(&device
->wakeup_list
);
506 spin_unlock(&acpi_device_lock
);
508 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
510 acpi_device_remove_files(device
);
511 device_unregister(&device
->dev
);
514 /* --------------------------------------------------------------------------
516 -------------------------------------------------------------------------- */
518 * acpi_bus_driver_init - add a device to a driver
519 * @device: the device to add and initialize
520 * @driver: driver for the device
522 * Used to initialize a device via its device driver. Called whenever a
523 * driver is bound to a device. Invokes the driver's add() ops.
526 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
531 if (!device
|| !driver
)
534 if (!driver
->ops
.add
)
537 result
= driver
->ops
.add(device
);
539 device
->driver
= NULL
;
540 acpi_driver_data(device
) = NULL
;
544 device
->driver
= driver
;
547 * TBD - Configuration Management: Assign resources to device based
548 * upon possible configuration and currently allocated resources.
551 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
552 "Driver successfully bound to device\n"));
556 static int acpi_start_single_object(struct acpi_device
*device
)
559 struct acpi_driver
*driver
;
562 if (!(driver
= device
->driver
))
565 if (driver
->ops
.start
) {
566 result
= driver
->ops
.start(device
);
567 if (result
&& driver
->ops
.remove
)
568 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
575 * acpi_bus_register_driver - register a driver with the ACPI bus
576 * @driver: driver being registered
578 * Registers a driver with the ACPI bus. Searches the namespace for all
579 * devices that match the driver's criteria and binds. Returns zero for
580 * success or a negative error status for failure.
582 int acpi_bus_register_driver(struct acpi_driver
*driver
)
588 driver
->drv
.name
= driver
->name
;
589 driver
->drv
.bus
= &acpi_bus_type
;
590 driver
->drv
.owner
= driver
->owner
;
592 ret
= driver_register(&driver
->drv
);
596 EXPORT_SYMBOL(acpi_bus_register_driver
);
599 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
600 * @driver: driver to unregister
602 * Unregisters a driver with the ACPI bus. Searches the namespace for all
603 * devices that match the driver's criteria and unbinds.
605 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
607 driver_unregister(&driver
->drv
);
610 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
612 /* --------------------------------------------------------------------------
614 -------------------------------------------------------------------------- */
616 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
620 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
621 union acpi_object
*obj
;
623 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
624 if (ACPI_FAILURE(status
))
627 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
628 if (ACPI_SUCCESS(status
)) {
629 obj
= buffer
.pointer
;
630 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
632 kfree(buffer
.pointer
);
636 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
638 void acpi_bus_data_handler(acpi_handle handle
, u32 function
, void *context
)
646 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
648 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
653 acpi_bus_extract_wakeup_device_power_package(struct acpi_device
*device
,
654 union acpi_object
*package
)
657 union acpi_object
*element
= NULL
;
659 if (!device
|| !package
|| (package
->package
.count
< 2))
660 return AE_BAD_PARAMETER
;
662 element
= &(package
->package
.elements
[0]);
664 return AE_BAD_PARAMETER
;
665 if (element
->type
== ACPI_TYPE_PACKAGE
) {
666 if ((element
->package
.count
< 2) ||
667 (element
->package
.elements
[0].type
!=
668 ACPI_TYPE_LOCAL_REFERENCE
)
669 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
671 device
->wakeup
.gpe_device
=
672 element
->package
.elements
[0].reference
.handle
;
673 device
->wakeup
.gpe_number
=
674 (u32
) element
->package
.elements
[1].integer
.value
;
675 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
676 device
->wakeup
.gpe_number
= element
->integer
.value
;
680 element
= &(package
->package
.elements
[1]);
681 if (element
->type
!= ACPI_TYPE_INTEGER
) {
684 device
->wakeup
.sleep_state
= element
->integer
.value
;
686 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
689 device
->wakeup
.resources
.count
= package
->package
.count
- 2;
690 for (i
= 0; i
< device
->wakeup
.resources
.count
; i
++) {
691 element
= &(package
->package
.elements
[i
+ 2]);
692 if (element
->type
!= ACPI_TYPE_LOCAL_REFERENCE
)
695 device
->wakeup
.resources
.handles
[i
] = element
->reference
.handle
;
701 static int acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
703 acpi_status status
= 0;
704 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
705 union acpi_object
*package
= NULL
;
708 struct acpi_device_id button_device_ids
[] = {
716 status
= acpi_evaluate_object(device
->handle
, "_PRW", NULL
, &buffer
);
717 if (ACPI_FAILURE(status
)) {
718 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
722 package
= (union acpi_object
*)buffer
.pointer
;
723 status
= acpi_bus_extract_wakeup_device_power_package(device
, package
);
724 if (ACPI_FAILURE(status
)) {
725 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
729 kfree(buffer
.pointer
);
731 device
->wakeup
.flags
.valid
= 1;
732 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
733 * system for the ACPI device with the _PRW object.
734 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
735 * So it is necessary to call _DSW object first. Only when it is not
736 * present will the _PSW object used.
738 psw_error
= acpi_device_sleep_wake(device
, 0, 0, 0);
740 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
741 "error in _DSW or _PSW evaluation\n"));
743 /* Power button, Lid switch always enable wakeup */
744 if (!acpi_match_device_ids(device
, button_device_ids
))
745 device
->wakeup
.flags
.run_wake
= 1;
748 if (ACPI_FAILURE(status
))
749 device
->flags
.wake_capable
= 0;
753 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
755 acpi_status status
= 0;
756 acpi_handle handle
= NULL
;
761 * Power Management Flags
763 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
764 if (ACPI_SUCCESS(status
))
765 device
->power
.flags
.explicit_get
= 1;
766 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
767 if (ACPI_SUCCESS(status
))
768 device
->power
.flags
.inrush_current
= 1;
771 * Enumerate supported power management states
773 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3
; i
++) {
774 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
775 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
777 /* Evaluate "_PRx" to se if power resources are referenced */
778 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
780 if (ps
->resources
.count
) {
781 device
->power
.flags
.power_resources
= 1;
785 /* Evaluate "_PSx" to see if we can do explicit sets */
786 object_name
[2] = 'S';
787 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
788 if (ACPI_SUCCESS(status
)) {
789 ps
->flags
.explicit_set
= 1;
793 /* State is valid if we have some power control */
794 if (ps
->resources
.count
|| ps
->flags
.explicit_set
)
797 ps
->power
= -1; /* Unknown - driver assigned */
798 ps
->latency
= -1; /* Unknown - driver assigned */
801 /* Set defaults for D0 and D3 states (always valid) */
802 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
803 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
804 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
805 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
807 /* TBD: System wake support and resource requirements. */
809 device
->power
.state
= ACPI_STATE_UNKNOWN
;
814 static int acpi_bus_get_flags(struct acpi_device
*device
)
816 acpi_status status
= AE_OK
;
817 acpi_handle temp
= NULL
;
820 /* Presence of _STA indicates 'dynamic_status' */
821 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
822 if (ACPI_SUCCESS(status
))
823 device
->flags
.dynamic_status
= 1;
825 /* Presence of _CID indicates 'compatible_ids' */
826 status
= acpi_get_handle(device
->handle
, "_CID", &temp
);
827 if (ACPI_SUCCESS(status
))
828 device
->flags
.compatible_ids
= 1;
830 /* Presence of _RMV indicates 'removable' */
831 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
832 if (ACPI_SUCCESS(status
))
833 device
->flags
.removable
= 1;
835 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
836 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
837 if (ACPI_SUCCESS(status
))
838 device
->flags
.ejectable
= 1;
840 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
841 if (ACPI_SUCCESS(status
))
842 device
->flags
.ejectable
= 1;
845 /* Presence of _LCK indicates 'lockable' */
846 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
847 if (ACPI_SUCCESS(status
))
848 device
->flags
.lockable
= 1;
850 /* Presence of _PS0|_PR0 indicates 'power manageable' */
851 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
852 if (ACPI_FAILURE(status
))
853 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
854 if (ACPI_SUCCESS(status
))
855 device
->flags
.power_manageable
= 1;
857 /* Presence of _PRW indicates wake capable */
858 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
859 if (ACPI_SUCCESS(status
))
860 device
->flags
.wake_capable
= 1;
862 /* TBD: Performance management */
867 static void acpi_device_get_busid(struct acpi_device
*device
,
868 acpi_handle handle
, int type
)
870 char bus_id
[5] = { '?', 0 };
871 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
877 * The device's Bus ID is simply the object name.
878 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
881 case ACPI_BUS_TYPE_SYSTEM
:
882 strcpy(device
->pnp
.bus_id
, "ACPI");
884 case ACPI_BUS_TYPE_POWER_BUTTON
:
885 strcpy(device
->pnp
.bus_id
, "PWRF");
887 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
888 strcpy(device
->pnp
.bus_id
, "SLPF");
891 acpi_get_name(handle
, ACPI_SINGLE_NAME
, &buffer
);
892 /* Clean up trailing underscores (if any) */
893 for (i
= 3; i
> 1; i
--) {
894 if (bus_id
[i
] == '_')
899 strcpy(device
->pnp
.bus_id
, bus_id
);
905 acpi_video_bus_match(struct acpi_device
*device
)
912 /* Since there is no HID, CID for ACPI Video drivers, we have
913 * to check well known required nodes for each feature we support.
916 /* Does this device able to support video switching ? */
917 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_DOD", &h_dummy
)) &&
918 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_DOS", &h_dummy
)))
921 /* Does this device able to retrieve a video ROM ? */
922 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_ROM", &h_dummy
)))
925 /* Does this device able to configure which video head to be POSTed ? */
926 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_VPO", &h_dummy
)) &&
927 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_GPD", &h_dummy
)) &&
928 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_SPD", &h_dummy
)))
935 * acpi_bay_match - see if a device is an ejectable driver bay
937 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
938 * then we can safely call it an ejectable drive bay
940 static int acpi_bay_match(struct acpi_device
*device
){
946 handle
= device
->handle
;
948 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
949 if (ACPI_FAILURE(status
))
952 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
953 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
954 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
955 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
958 if (acpi_get_parent(handle
, &phandle
))
961 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
962 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
963 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
964 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
971 * acpi_dock_match - see if a device has a _DCK method
973 static int acpi_dock_match(struct acpi_device
*device
)
976 return acpi_get_handle(device
->handle
, "_DCK", &tmp
);
979 static void acpi_device_set_id(struct acpi_device
*device
,
980 struct acpi_device
*parent
, acpi_handle handle
,
983 struct acpi_device_info
*info
;
984 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
987 struct acpi_compatible_id_list
*cid_list
= NULL
;
988 const char *cid_add
= NULL
;
992 case ACPI_BUS_TYPE_DEVICE
:
993 status
= acpi_get_object_info(handle
, &buffer
);
994 if (ACPI_FAILURE(status
)) {
995 printk(KERN_ERR PREFIX
"%s: Error reading device info\n", __func__
);
999 info
= buffer
.pointer
;
1000 if (info
->valid
& ACPI_VALID_HID
)
1001 hid
= info
->hardware_id
.value
;
1002 if (info
->valid
& ACPI_VALID_UID
)
1003 uid
= info
->unique_id
.value
;
1004 if (info
->valid
& ACPI_VALID_CID
)
1005 cid_list
= &info
->compatibility_id
;
1006 if (info
->valid
& ACPI_VALID_ADR
) {
1007 device
->pnp
.bus_address
= info
->address
;
1008 device
->flags
.bus_address
= 1;
1011 /* If we have a video/bay/dock device, add our selfdefined
1012 HID to the CID list. Like that the video/bay/dock drivers
1013 will get autoloaded and the device might still match
1014 against another driver.
1016 if (ACPI_SUCCESS(acpi_video_bus_match(device
)))
1017 cid_add
= ACPI_VIDEO_HID
;
1018 else if (ACPI_SUCCESS(acpi_bay_match(device
)))
1019 cid_add
= ACPI_BAY_HID
;
1020 else if (ACPI_SUCCESS(acpi_dock_match(device
)))
1021 cid_add
= ACPI_DOCK_HID
;
1024 case ACPI_BUS_TYPE_POWER
:
1025 hid
= ACPI_POWER_HID
;
1027 case ACPI_BUS_TYPE_PROCESSOR
:
1028 hid
= ACPI_PROCESSOR_HID
;
1030 case ACPI_BUS_TYPE_SYSTEM
:
1031 hid
= ACPI_SYSTEM_HID
;
1033 case ACPI_BUS_TYPE_THERMAL
:
1034 hid
= ACPI_THERMAL_HID
;
1036 case ACPI_BUS_TYPE_POWER_BUTTON
:
1037 hid
= ACPI_BUTTON_HID_POWERF
;
1039 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1040 hid
= ACPI_BUTTON_HID_SLEEPF
;
1047 * Fix for the system root bus device -- the only root-level device.
1049 if (((acpi_handle
)parent
== ACPI_ROOT_OBJECT
) && (type
== ACPI_BUS_TYPE_DEVICE
)) {
1051 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1052 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1056 strcpy(device
->pnp
.hardware_id
, hid
);
1057 device
->flags
.hardware_id
= 1;
1060 strcpy(device
->pnp
.unique_id
, uid
);
1061 device
->flags
.unique_id
= 1;
1063 if (cid_list
|| cid_add
) {
1064 struct acpi_compatible_id_list
*list
;
1069 size
= cid_list
->size
;
1070 } else if (cid_add
) {
1071 size
= sizeof(struct acpi_compatible_id_list
);
1072 cid_list
= ACPI_ALLOCATE_ZEROED((acpi_size
) size
);
1074 printk(KERN_ERR
"Memory allocation error\n");
1075 kfree(buffer
.pointer
);
1078 cid_list
->count
= 0;
1079 cid_list
->size
= size
;
1083 size
+= sizeof(struct acpi_compatible_id
);
1084 list
= kmalloc(size
, GFP_KERNEL
);
1088 memcpy(list
, cid_list
, cid_list
->size
);
1089 count
= cid_list
->count
;
1092 strncpy(list
->id
[count
].value
, cid_add
,
1093 ACPI_MAX_CID_LENGTH
);
1095 device
->flags
.compatible_ids
= 1;
1098 list
->count
= count
;
1099 device
->pnp
.cid_list
= list
;
1101 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1104 kfree(buffer
.pointer
);
1107 static int acpi_device_set_context(struct acpi_device
*device
, int type
)
1109 acpi_status status
= AE_OK
;
1114 * Attach this 'struct acpi_device' to the ACPI object. This makes
1115 * resolutions from handle->device very efficient. Note that we need
1116 * to be careful with fixed-feature devices as they all attach to the
1119 if (type
!= ACPI_BUS_TYPE_POWER_BUTTON
&&
1120 type
!= ACPI_BUS_TYPE_SLEEP_BUTTON
) {
1121 status
= acpi_attach_data(device
->handle
,
1122 acpi_bus_data_handler
, device
);
1124 if (ACPI_FAILURE(status
)) {
1125 printk(KERN_ERR PREFIX
"Error attaching device data\n");
1132 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
1137 dev
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1138 device_release_driver(&dev
->dev
);
1144 * unbind _ADR-Based Devices when hot removal
1146 if (dev
->flags
.bus_address
) {
1147 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
1148 dev
->parent
->ops
.unbind(dev
);
1150 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
1156 acpi_is_child_device(struct acpi_device
*device
,
1157 int (*matcher
)(struct acpi_device
*))
1159 int result
= -ENODEV
;
1162 if (ACPI_SUCCESS(matcher(device
)))
1164 } while ((device
= device
->parent
));
1170 acpi_add_single_object(struct acpi_device
**child
,
1171 struct acpi_device
*parent
, acpi_handle handle
, int type
,
1172 struct acpi_bus_ops
*ops
)
1175 struct acpi_device
*device
= NULL
;
1181 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1183 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1187 device
->handle
= handle
;
1188 device
->parent
= parent
;
1189 device
->bus_ops
= *ops
; /* workround for not call .start */
1192 acpi_device_get_busid(device
, handle
, type
);
1197 * Get prior to calling acpi_bus_get_status() so we know whether
1198 * or not _STA is present. Note that we only look for object
1199 * handles -- cannot evaluate objects until we know the device is
1200 * present and properly initialized.
1202 result
= acpi_bus_get_flags(device
);
1209 * See if the device is present. We always assume that non-Device
1210 * and non-Processor objects (e.g. thermal zones, power resources,
1211 * etc.) are present, functioning, etc. (at least when parent object
1212 * is present). Note that _STA has a different meaning for some
1213 * objects (e.g. power resources) so we need to be careful how we use
1217 case ACPI_BUS_TYPE_PROCESSOR
:
1218 case ACPI_BUS_TYPE_DEVICE
:
1219 result
= acpi_bus_get_status(device
);
1220 if (ACPI_FAILURE(result
)) {
1224 if (!device
->status
.present
) {
1225 /* Bay and dock should be handled even if absent */
1227 acpi_is_child_device(device
, acpi_bay_match
)) &&
1229 acpi_is_child_device(device
, acpi_dock_match
))) {
1236 STRUCT_TO_INT(device
->status
) =
1237 ACPI_STA_DEVICE_PRESENT
| ACPI_STA_DEVICE_ENABLED
|
1238 ACPI_STA_DEVICE_UI
| ACPI_STA_DEVICE_FUNCTIONING
;
1245 * TBD: Synch with Core's enumeration/initialization process.
1249 * Hardware ID, Unique ID, & Bus Address
1250 * -------------------------------------
1252 acpi_device_set_id(device
, parent
, handle
, type
);
1258 if (device
->flags
.power_manageable
) {
1259 result
= acpi_bus_get_power_flags(device
);
1265 * Wakeup device management
1266 *-----------------------
1268 if (device
->flags
.wake_capable
) {
1269 result
= acpi_bus_get_wakeup_device_flags(device
);
1275 * Performance Management
1276 * ----------------------
1278 if (device
->flags
.performance_manageable
) {
1279 result
= acpi_bus_get_perf_flags(device
);
1284 if ((result
= acpi_device_set_context(device
, type
)))
1287 result
= acpi_device_register(device
, parent
);
1290 * Bind _ADR-Based Devices when hot add
1292 if (device
->flags
.bus_address
) {
1293 if (device
->parent
&& device
->parent
->ops
.bind
)
1294 device
->parent
->ops
.bind(device
);
1301 kfree(device
->pnp
.cid_list
);
1308 static int acpi_bus_scan(struct acpi_device
*start
, struct acpi_bus_ops
*ops
)
1310 acpi_status status
= AE_OK
;
1311 struct acpi_device
*parent
= NULL
;
1312 struct acpi_device
*child
= NULL
;
1313 acpi_handle phandle
= NULL
;
1314 acpi_handle chandle
= NULL
;
1315 acpi_object_type type
= 0;
1323 phandle
= start
->handle
;
1326 * Parse through the ACPI namespace, identify all 'devices', and
1327 * create a new 'struct acpi_device' for each.
1329 while ((level
> 0) && parent
) {
1331 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1335 * If this scope is exhausted then move our way back up.
1337 if (ACPI_FAILURE(status
)) {
1340 acpi_get_parent(phandle
, &phandle
);
1342 parent
= parent
->parent
;
1346 status
= acpi_get_type(chandle
, &type
);
1347 if (ACPI_FAILURE(status
))
1351 * If this is a scope object then parse it (depth-first).
1353 if (type
== ACPI_TYPE_LOCAL_SCOPE
) {
1361 * We're only interested in objects that we consider 'devices'.
1364 case ACPI_TYPE_DEVICE
:
1365 type
= ACPI_BUS_TYPE_DEVICE
;
1367 case ACPI_TYPE_PROCESSOR
:
1368 type
= ACPI_BUS_TYPE_PROCESSOR
;
1370 case ACPI_TYPE_THERMAL
:
1371 type
= ACPI_BUS_TYPE_THERMAL
;
1373 case ACPI_TYPE_POWER
:
1374 type
= ACPI_BUS_TYPE_POWER
;
1380 if (ops
->acpi_op_add
)
1381 status
= acpi_add_single_object(&child
, parent
,
1382 chandle
, type
, ops
);
1384 status
= acpi_bus_get_device(chandle
, &child
);
1386 if (ACPI_FAILURE(status
))
1389 if (ops
->acpi_op_start
&& !(ops
->acpi_op_add
)) {
1390 status
= acpi_start_single_object(child
);
1391 if (ACPI_FAILURE(status
))
1396 * If the device is present, enabled, and functioning then
1397 * parse its scope (depth-first). Note that we need to
1398 * represent absent devices to facilitate PnP notifications
1399 * -- but only the subtree head (not all of its children,
1400 * which will be enumerated when the parent is inserted).
1402 * TBD: Need notifications and other detection mechanisms
1403 * in place before we can fully implement this.
1405 if (child
->status
.present
) {
1406 status
= acpi_get_next_object(ACPI_TYPE_ANY
, chandle
,
1408 if (ACPI_SUCCESS(status
)) {
1421 acpi_bus_add(struct acpi_device
**child
,
1422 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1425 struct acpi_bus_ops ops
;
1427 memset(&ops
, 0, sizeof(ops
));
1428 ops
.acpi_op_add
= 1;
1430 result
= acpi_add_single_object(child
, parent
, handle
, type
, &ops
);
1432 result
= acpi_bus_scan(*child
, &ops
);
1437 EXPORT_SYMBOL(acpi_bus_add
);
1439 int acpi_bus_start(struct acpi_device
*device
)
1442 struct acpi_bus_ops ops
;
1448 result
= acpi_start_single_object(device
);
1450 memset(&ops
, 0, sizeof(ops
));
1451 ops
.acpi_op_start
= 1;
1452 result
= acpi_bus_scan(device
, &ops
);
1457 EXPORT_SYMBOL(acpi_bus_start
);
1459 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1462 struct acpi_device
*parent
, *child
;
1463 acpi_handle phandle
, chandle
;
1464 acpi_object_type type
;
1469 phandle
= start
->handle
;
1470 child
= chandle
= NULL
;
1472 while ((level
> 0) && parent
&& (!err
)) {
1473 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1477 * If this scope is exhausted then move our way back up.
1479 if (ACPI_FAILURE(status
)) {
1482 acpi_get_parent(phandle
, &phandle
);
1484 parent
= parent
->parent
;
1487 err
= acpi_bus_remove(child
, rmdevice
);
1489 err
= acpi_bus_remove(child
, 1);
1494 status
= acpi_get_type(chandle
, &type
);
1495 if (ACPI_FAILURE(status
)) {
1499 * If there is a device corresponding to chandle then
1500 * parse it (depth-first).
1502 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1512 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1515 static int acpi_bus_scan_fixed(struct acpi_device
*root
)
1518 struct acpi_device
*device
= NULL
;
1519 struct acpi_bus_ops ops
;
1524 memset(&ops
, 0, sizeof(ops
));
1525 ops
.acpi_op_add
= 1;
1526 ops
.acpi_op_start
= 1;
1529 * Enumerate all fixed-feature devices.
1531 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1532 result
= acpi_add_single_object(&device
, acpi_root
,
1534 ACPI_BUS_TYPE_POWER_BUTTON
,
1538 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1539 result
= acpi_add_single_object(&device
, acpi_root
,
1541 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1549 static int __init
acpi_scan_init(void)
1552 struct acpi_bus_ops ops
;
1558 memset(&ops
, 0, sizeof(ops
));
1559 ops
.acpi_op_add
= 1;
1560 ops
.acpi_op_start
= 1;
1562 result
= bus_register(&acpi_bus_type
);
1564 /* We don't want to quit even if we failed to add suspend/resume */
1565 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1569 * Create the root device in the bus's device tree
1571 result
= acpi_add_single_object(&acpi_root
, NULL
, ACPI_ROOT_OBJECT
,
1572 ACPI_BUS_TYPE_SYSTEM
, &ops
);
1577 * Enumerate devices in the ACPI namespace.
1579 result
= acpi_bus_scan_fixed(acpi_root
);
1582 result
= acpi_bus_scan(acpi_root
, &ops
);
1585 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);
1591 subsys_initcall(acpi_scan_init
);