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>
10 #include <acpi/acpi_drivers.h>
11 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
13 #define _COMPONENT ACPI_BUS_COMPONENT
14 ACPI_MODULE_NAME("scan");
15 #define STRUCT_TO_INT(s) (*((int*)&s))
16 extern struct acpi_device
*acpi_root
;
18 #define ACPI_BUS_CLASS "system_bus"
19 #define ACPI_BUS_HID "LNXSYBUS"
20 #define ACPI_BUS_DEVICE_NAME "System Bus"
22 static LIST_HEAD(acpi_device_list
);
23 static LIST_HEAD(acpi_bus_id_list
);
24 DEFINE_SPINLOCK(acpi_device_lock
);
25 LIST_HEAD(acpi_wakeup_device_list
);
27 struct acpi_device_bus_id
{
29 unsigned int instance_no
;
30 struct list_head node
;
34 * Creates hid/cid(s) string needed for modalias and uevent
35 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
36 * char *modalias: "acpi:IBM0001:ACPI0001"
38 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
43 if (!acpi_dev
->flags
.hardware_id
)
46 len
= snprintf(modalias
, size
, "acpi:%s:",
47 acpi_dev
->pnp
.hardware_id
);
48 if (len
< 0 || len
>= size
)
52 if (acpi_dev
->flags
.compatible_ids
) {
53 struct acpi_compatible_id_list
*cid_list
;
57 cid_list
= acpi_dev
->pnp
.cid_list
;
58 for (i
= 0; i
< cid_list
->count
; i
++) {
59 count
= snprintf(&modalias
[len
], size
, "%s:",
60 cid_list
->id
[i
].value
);
61 if (count
< 0 || count
>= size
) {
62 printk(KERN_ERR
"acpi: %s cid[%i] exceeds event buffer size",
63 acpi_dev
->pnp
.device_name
, i
);
76 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
77 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
80 /* Device has no HID and no CID or string is >1024 */
81 len
= create_modalias(acpi_dev
, buf
, 1024);
87 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
89 static int acpi_eject_operation(acpi_handle handle
, int lockable
)
91 struct acpi_object_list arg_list
;
92 union acpi_object arg
;
93 acpi_status status
= AE_OK
;
101 arg_list
.pointer
= &arg
;
102 arg
.type
= ACPI_TYPE_INTEGER
;
103 arg
.integer
.value
= 0;
104 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
108 arg_list
.pointer
= &arg
;
109 arg
.type
= ACPI_TYPE_INTEGER
;
110 arg
.integer
.value
= 1;
116 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
117 if (ACPI_FAILURE(status
)) {
125 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
126 const char *buf
, size_t count
)
133 acpi_object_type type
= 0;
134 struct acpi_device
*acpi_device
= to_acpi_device(d
);
136 if ((!count
) || (buf
[0] != '1')) {
140 if (acpi_device
->driver
== NULL
) {
145 status
= acpi_get_type(acpi_device
->handle
, &type
);
146 if (ACPI_FAILURE(status
) || (!acpi_device
->flags
.ejectable
)) {
151 islockable
= acpi_device
->flags
.lockable
;
152 handle
= acpi_device
->handle
;
154 result
= acpi_bus_trim(acpi_device
, 1);
157 result
= acpi_eject_operation(handle
, islockable
);
166 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
169 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
170 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
172 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.hardware_id
);
174 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
177 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
178 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
179 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
182 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
186 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
191 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
193 static int acpi_device_setup_files(struct acpi_device
*dev
)
200 * Devices gotten from FADT don't have a "path" attribute
203 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
208 if(dev
->flags
.hardware_id
) {
209 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
214 if (dev
->flags
.hardware_id
|| dev
->flags
.compatible_ids
){
215 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
221 * If device has _EJ0, 'eject' file is created that is used to trigger
222 * hot-removal function from userland.
224 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
225 if (ACPI_SUCCESS(status
))
226 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
231 static void acpi_device_remove_files(struct acpi_device
*dev
)
237 * If device has _EJ0, 'eject' file is created that is used to trigger
238 * hot-removal function from userland.
240 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
241 if (ACPI_SUCCESS(status
))
242 device_remove_file(&dev
->dev
, &dev_attr_eject
);
244 if (dev
->flags
.hardware_id
|| dev
->flags
.compatible_ids
)
245 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
247 if(dev
->flags
.hardware_id
)
248 device_remove_file(&dev
->dev
, &dev_attr_hid
);
250 device_remove_file(&dev
->dev
, &dev_attr_path
);
252 /* --------------------------------------------------------------------------
254 -------------------------------------------------------------------------- */
256 int acpi_match_device_ids(struct acpi_device
*device
,
257 const struct acpi_device_id
*ids
)
259 const struct acpi_device_id
*id
;
261 if (device
->flags
.hardware_id
) {
262 for (id
= ids
; id
->id
[0]; id
++) {
263 if (!strcmp((char*)id
->id
, device
->pnp
.hardware_id
))
268 if (device
->flags
.compatible_ids
) {
269 struct acpi_compatible_id_list
*cid_list
= device
->pnp
.cid_list
;
272 for (id
= ids
; id
->id
[0]; id
++) {
273 /* compare multiple _CID entries against driver ids */
274 for (i
= 0; i
< cid_list
->count
; i
++) {
275 if (!strcmp((char*)id
->id
,
276 cid_list
->id
[i
].value
))
284 EXPORT_SYMBOL(acpi_match_device_ids
);
286 static void acpi_device_release(struct device
*dev
)
288 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
290 kfree(acpi_dev
->pnp
.cid_list
);
294 static int acpi_device_suspend(struct device
*dev
, pm_message_t state
)
296 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
297 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
299 if (acpi_drv
&& acpi_drv
->ops
.suspend
)
300 return acpi_drv
->ops
.suspend(acpi_dev
, state
);
304 static int acpi_device_resume(struct device
*dev
)
306 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
307 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
309 if (acpi_drv
&& acpi_drv
->ops
.resume
)
310 return acpi_drv
->ops
.resume(acpi_dev
);
314 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
316 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
317 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
319 return !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
322 static int acpi_device_uevent(struct device
*dev
, char **envp
, int num_envp
,
323 char *buffer
, int buffer_size
)
325 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
327 strcpy(buffer
, "MODALIAS=");
328 if (create_modalias(acpi_dev
, buffer
+ 9, buffer_size
- 9) > 0) {
335 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
336 static int acpi_start_single_object(struct acpi_device
*);
337 static int acpi_device_probe(struct device
* dev
)
339 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
340 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
343 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
345 if (acpi_dev
->bus_ops
.acpi_op_start
)
346 acpi_start_single_object(acpi_dev
);
347 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
348 "Found driver [%s] for device [%s]\n",
349 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
355 static int acpi_device_remove(struct device
* dev
)
357 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
358 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
361 if (acpi_drv
->ops
.stop
)
362 acpi_drv
->ops
.stop(acpi_dev
, acpi_dev
->removal_type
);
363 if (acpi_drv
->ops
.remove
)
364 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
366 acpi_dev
->driver
= NULL
;
367 acpi_driver_data(dev
) = NULL
;
373 static void acpi_device_shutdown(struct device
*dev
)
375 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
376 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
378 if (acpi_drv
&& acpi_drv
->ops
.shutdown
)
379 acpi_drv
->ops
.shutdown(acpi_dev
);
384 struct bus_type acpi_bus_type
= {
386 .suspend
= acpi_device_suspend
,
387 .resume
= acpi_device_resume
,
388 .shutdown
= acpi_device_shutdown
,
389 .match
= acpi_bus_match
,
390 .probe
= acpi_device_probe
,
391 .remove
= acpi_device_remove
,
392 .uevent
= acpi_device_uevent
,
395 static int acpi_device_register(struct acpi_device
*device
,
396 struct acpi_device
*parent
)
399 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
404 * Link this device to its parent and siblings.
406 INIT_LIST_HEAD(&device
->children
);
407 INIT_LIST_HEAD(&device
->node
);
408 INIT_LIST_HEAD(&device
->g_list
);
409 INIT_LIST_HEAD(&device
->wakeup_list
);
411 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
413 printk(KERN_ERR PREFIX
"Memory allocation error\n");
417 spin_lock(&acpi_device_lock
);
419 * Find suitable bus_id and instance number in acpi_bus_id_list
420 * If failed, create one and link it into acpi_bus_id_list
422 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
423 if(!strcmp(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device")) {
424 acpi_device_bus_id
->instance_no
++;
431 acpi_device_bus_id
= new_bus_id
;
432 strcpy(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device");
433 acpi_device_bus_id
->instance_no
= 0;
434 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
436 sprintf(device
->dev
.bus_id
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
438 if (device
->parent
) {
439 list_add_tail(&device
->node
, &device
->parent
->children
);
440 list_add_tail(&device
->g_list
, &device
->parent
->g_list
);
442 list_add_tail(&device
->g_list
, &acpi_device_list
);
443 if (device
->wakeup
.flags
.valid
)
444 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
445 spin_unlock(&acpi_device_lock
);
448 device
->dev
.parent
= &parent
->dev
;
449 device
->dev
.bus
= &acpi_bus_type
;
450 device_initialize(&device
->dev
);
451 device
->dev
.release
= &acpi_device_release
;
452 result
= device_add(&device
->dev
);
454 printk("Error adding device %s", device
->dev
.bus_id
);
458 result
= acpi_device_setup_files(device
);
460 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error creating sysfs interface for device %s\n", device
->dev
.bus_id
));
462 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
465 spin_lock(&acpi_device_lock
);
466 if (device
->parent
) {
467 list_del(&device
->node
);
468 list_del(&device
->g_list
);
470 list_del(&device
->g_list
);
471 list_del(&device
->wakeup_list
);
472 spin_unlock(&acpi_device_lock
);
476 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
478 spin_lock(&acpi_device_lock
);
479 if (device
->parent
) {
480 list_del(&device
->node
);
481 list_del(&device
->g_list
);
483 list_del(&device
->g_list
);
485 list_del(&device
->wakeup_list
);
486 spin_unlock(&acpi_device_lock
);
488 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
490 acpi_device_remove_files(device
);
491 device_unregister(&device
->dev
);
494 /* --------------------------------------------------------------------------
496 -------------------------------------------------------------------------- */
498 * acpi_bus_driver_init - add a device to a driver
499 * @device: the device to add and initialize
500 * @driver: driver for the device
502 * Used to initialize a device via its device driver. Called whenever a
503 * driver is bound to a device. Invokes the driver's add() ops.
506 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
511 if (!device
|| !driver
)
514 if (!driver
->ops
.add
)
517 result
= driver
->ops
.add(device
);
519 device
->driver
= NULL
;
520 acpi_driver_data(device
) = NULL
;
524 device
->driver
= driver
;
527 * TBD - Configuration Management: Assign resources to device based
528 * upon possible configuration and currently allocated resources.
531 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
532 "Driver successfully bound to device\n"));
536 static int acpi_start_single_object(struct acpi_device
*device
)
539 struct acpi_driver
*driver
;
542 if (!(driver
= device
->driver
))
545 if (driver
->ops
.start
) {
546 result
= driver
->ops
.start(device
);
547 if (result
&& driver
->ops
.remove
)
548 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
555 * acpi_bus_register_driver - register a driver with the ACPI bus
556 * @driver: driver being registered
558 * Registers a driver with the ACPI bus. Searches the namespace for all
559 * devices that match the driver's criteria and binds. Returns zero for
560 * success or a negative error status for failure.
562 int acpi_bus_register_driver(struct acpi_driver
*driver
)
568 driver
->drv
.name
= driver
->name
;
569 driver
->drv
.bus
= &acpi_bus_type
;
570 driver
->drv
.owner
= driver
->owner
;
572 ret
= driver_register(&driver
->drv
);
576 EXPORT_SYMBOL(acpi_bus_register_driver
);
579 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
580 * @driver: driver to unregister
582 * Unregisters a driver with the ACPI bus. Searches the namespace for all
583 * devices that match the driver's criteria and unbinds.
585 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
587 driver_unregister(&driver
->drv
);
590 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
592 /* --------------------------------------------------------------------------
594 -------------------------------------------------------------------------- */
596 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
600 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
601 union acpi_object
*obj
;
603 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
604 if (ACPI_FAILURE(status
))
607 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
608 if (ACPI_SUCCESS(status
)) {
609 obj
= buffer
.pointer
;
610 status
= acpi_get_handle(NULL
, obj
->string
.pointer
, ejd
);
611 kfree(buffer
.pointer
);
615 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
617 void acpi_bus_data_handler(acpi_handle handle
, u32 function
, void *context
)
625 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
627 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
632 acpi_bus_extract_wakeup_device_power_package(struct acpi_device
*device
,
633 union acpi_object
*package
)
636 union acpi_object
*element
= NULL
;
638 if (!device
|| !package
|| (package
->package
.count
< 2))
639 return AE_BAD_PARAMETER
;
641 element
= &(package
->package
.elements
[0]);
643 return AE_BAD_PARAMETER
;
644 if (element
->type
== ACPI_TYPE_PACKAGE
) {
645 if ((element
->package
.count
< 2) ||
646 (element
->package
.elements
[0].type
!=
647 ACPI_TYPE_LOCAL_REFERENCE
)
648 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
650 device
->wakeup
.gpe_device
=
651 element
->package
.elements
[0].reference
.handle
;
652 device
->wakeup
.gpe_number
=
653 (u32
) element
->package
.elements
[1].integer
.value
;
654 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
655 device
->wakeup
.gpe_number
= element
->integer
.value
;
659 element
= &(package
->package
.elements
[1]);
660 if (element
->type
!= ACPI_TYPE_INTEGER
) {
663 device
->wakeup
.sleep_state
= element
->integer
.value
;
665 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
668 device
->wakeup
.resources
.count
= package
->package
.count
- 2;
669 for (i
= 0; i
< device
->wakeup
.resources
.count
; i
++) {
670 element
= &(package
->package
.elements
[i
+ 2]);
671 if (element
->type
!= ACPI_TYPE_ANY
) {
675 device
->wakeup
.resources
.handles
[i
] = element
->reference
.handle
;
681 static int acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
683 acpi_status status
= 0;
684 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
685 union acpi_object
*package
= NULL
;
687 struct acpi_device_id button_device_ids
[] = {
696 status
= acpi_evaluate_object(device
->handle
, "_PRW", NULL
, &buffer
);
697 if (ACPI_FAILURE(status
)) {
698 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
702 package
= (union acpi_object
*)buffer
.pointer
;
703 status
= acpi_bus_extract_wakeup_device_power_package(device
, package
);
704 if (ACPI_FAILURE(status
)) {
705 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
709 kfree(buffer
.pointer
);
711 device
->wakeup
.flags
.valid
= 1;
712 /* Power button, Lid switch always enable wakeup */
713 if (!acpi_match_device_ids(device
, button_device_ids
))
714 device
->wakeup
.flags
.run_wake
= 1;
717 if (ACPI_FAILURE(status
))
718 device
->flags
.wake_capable
= 0;
722 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
724 acpi_status status
= 0;
725 acpi_handle handle
= NULL
;
730 * Power Management Flags
732 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
733 if (ACPI_SUCCESS(status
))
734 device
->power
.flags
.explicit_get
= 1;
735 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
736 if (ACPI_SUCCESS(status
))
737 device
->power
.flags
.inrush_current
= 1;
740 * Enumerate supported power management states
742 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3
; i
++) {
743 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
744 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
746 /* Evaluate "_PRx" to se if power resources are referenced */
747 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
749 if (ps
->resources
.count
) {
750 device
->power
.flags
.power_resources
= 1;
754 /* Evaluate "_PSx" to see if we can do explicit sets */
755 object_name
[2] = 'S';
756 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
757 if (ACPI_SUCCESS(status
)) {
758 ps
->flags
.explicit_set
= 1;
762 /* State is valid if we have some power control */
763 if (ps
->resources
.count
|| ps
->flags
.explicit_set
)
766 ps
->power
= -1; /* Unknown - driver assigned */
767 ps
->latency
= -1; /* Unknown - driver assigned */
770 /* Set defaults for D0 and D3 states (always valid) */
771 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
772 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
773 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
774 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
776 /* TBD: System wake support and resource requirements. */
778 device
->power
.state
= ACPI_STATE_UNKNOWN
;
783 static int acpi_bus_get_flags(struct acpi_device
*device
)
785 acpi_status status
= AE_OK
;
786 acpi_handle temp
= NULL
;
789 /* Presence of _STA indicates 'dynamic_status' */
790 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
791 if (ACPI_SUCCESS(status
))
792 device
->flags
.dynamic_status
= 1;
794 /* Presence of _CID indicates 'compatible_ids' */
795 status
= acpi_get_handle(device
->handle
, "_CID", &temp
);
796 if (ACPI_SUCCESS(status
))
797 device
->flags
.compatible_ids
= 1;
799 /* Presence of _RMV indicates 'removable' */
800 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
801 if (ACPI_SUCCESS(status
))
802 device
->flags
.removable
= 1;
804 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
805 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
806 if (ACPI_SUCCESS(status
))
807 device
->flags
.ejectable
= 1;
809 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
810 if (ACPI_SUCCESS(status
))
811 device
->flags
.ejectable
= 1;
814 /* Presence of _LCK indicates 'lockable' */
815 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
816 if (ACPI_SUCCESS(status
))
817 device
->flags
.lockable
= 1;
819 /* Presence of _PS0|_PR0 indicates 'power manageable' */
820 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
821 if (ACPI_FAILURE(status
))
822 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
823 if (ACPI_SUCCESS(status
))
824 device
->flags
.power_manageable
= 1;
826 /* Presence of _PRW indicates wake capable */
827 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
828 if (ACPI_SUCCESS(status
))
829 device
->flags
.wake_capable
= 1;
831 /* TBD: Peformance management */
836 static void acpi_device_get_busid(struct acpi_device
*device
,
837 acpi_handle handle
, int type
)
839 char bus_id
[5] = { '?', 0 };
840 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
846 * The device's Bus ID is simply the object name.
847 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
850 case ACPI_BUS_TYPE_SYSTEM
:
851 strcpy(device
->pnp
.bus_id
, "ACPI");
853 case ACPI_BUS_TYPE_POWER_BUTTON
:
854 strcpy(device
->pnp
.bus_id
, "PWRF");
856 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
857 strcpy(device
->pnp
.bus_id
, "SLPF");
860 acpi_get_name(handle
, ACPI_SINGLE_NAME
, &buffer
);
861 /* Clean up trailing underscores (if any) */
862 for (i
= 3; i
> 1; i
--) {
863 if (bus_id
[i
] == '_')
868 strcpy(device
->pnp
.bus_id
, bus_id
);
874 acpi_video_bus_match(struct acpi_device
*device
)
876 acpi_handle h_dummy1
;
877 acpi_handle h_dummy2
;
878 acpi_handle h_dummy3
;
884 /* Since there is no HID, CID for ACPI Video drivers, we have
885 * to check well known required nodes for each feature we support.
888 /* Does this device able to support video switching ? */
889 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_DOD", &h_dummy1
)) &&
890 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_DOS", &h_dummy2
)))
893 /* Does this device able to retrieve a video ROM ? */
894 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_ROM", &h_dummy1
)))
897 /* Does this device able to configure which video head to be POSTed ? */
898 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_VPO", &h_dummy1
)) &&
899 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_GPD", &h_dummy2
)) &&
900 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_SPD", &h_dummy3
)))
907 * acpi_bay_match - see if a device is an ejectable driver bay
909 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
910 * then we can safely call it an ejectable drive bay
912 static int acpi_bay_match(struct acpi_device
*device
){
918 handle
= device
->handle
;
920 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
921 if (ACPI_FAILURE(status
))
924 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
925 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
926 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
927 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
930 if (acpi_get_parent(handle
, &phandle
))
933 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
934 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
935 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
936 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
942 static void acpi_device_set_id(struct acpi_device
*device
,
943 struct acpi_device
*parent
, acpi_handle handle
,
946 struct acpi_device_info
*info
;
947 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
950 struct acpi_compatible_id_list
*cid_list
= NULL
;
954 case ACPI_BUS_TYPE_DEVICE
:
955 status
= acpi_get_object_info(handle
, &buffer
);
956 if (ACPI_FAILURE(status
)) {
957 printk("%s: Error reading device info\n", __FUNCTION__
);
961 info
= buffer
.pointer
;
962 if (info
->valid
& ACPI_VALID_HID
)
963 hid
= info
->hardware_id
.value
;
964 if (info
->valid
& ACPI_VALID_UID
)
965 uid
= info
->unique_id
.value
;
966 if (info
->valid
& ACPI_VALID_CID
)
967 cid_list
= &info
->compatibility_id
;
968 if (info
->valid
& ACPI_VALID_ADR
) {
969 device
->pnp
.bus_address
= info
->address
;
970 device
->flags
.bus_address
= 1;
973 if(!(info
->valid
& (ACPI_VALID_HID
| ACPI_VALID_CID
))){
974 status
= acpi_video_bus_match(device
);
975 if(ACPI_SUCCESS(status
))
976 hid
= ACPI_VIDEO_HID
;
978 status
= acpi_bay_match(device
);
979 if (ACPI_SUCCESS(status
))
983 case ACPI_BUS_TYPE_POWER
:
984 hid
= ACPI_POWER_HID
;
986 case ACPI_BUS_TYPE_PROCESSOR
:
987 hid
= ACPI_PROCESSOR_HID
;
989 case ACPI_BUS_TYPE_SYSTEM
:
990 hid
= ACPI_SYSTEM_HID
;
992 case ACPI_BUS_TYPE_THERMAL
:
993 hid
= ACPI_THERMAL_HID
;
995 case ACPI_BUS_TYPE_POWER_BUTTON
:
996 hid
= ACPI_BUTTON_HID_POWERF
;
998 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
999 hid
= ACPI_BUTTON_HID_SLEEPF
;
1006 * Fix for the system root bus device -- the only root-level device.
1008 if (((acpi_handle
)parent
== ACPI_ROOT_OBJECT
) && (type
== ACPI_BUS_TYPE_DEVICE
)) {
1010 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1011 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1015 strcpy(device
->pnp
.hardware_id
, hid
);
1016 device
->flags
.hardware_id
= 1;
1019 strcpy(device
->pnp
.unique_id
, uid
);
1020 device
->flags
.unique_id
= 1;
1023 device
->pnp
.cid_list
= kmalloc(cid_list
->size
, GFP_KERNEL
);
1024 if (device
->pnp
.cid_list
)
1025 memcpy(device
->pnp
.cid_list
, cid_list
, cid_list
->size
);
1027 printk(KERN_ERR
"Memory allocation error\n");
1030 kfree(buffer
.pointer
);
1033 static int acpi_device_set_context(struct acpi_device
*device
, int type
)
1035 acpi_status status
= AE_OK
;
1040 * Attach this 'struct acpi_device' to the ACPI object. This makes
1041 * resolutions from handle->device very efficient. Note that we need
1042 * to be careful with fixed-feature devices as they all attach to the
1045 if (type
!= ACPI_BUS_TYPE_POWER_BUTTON
&&
1046 type
!= ACPI_BUS_TYPE_SLEEP_BUTTON
) {
1047 status
= acpi_attach_data(device
->handle
,
1048 acpi_bus_data_handler
, device
);
1050 if (ACPI_FAILURE(status
)) {
1051 printk("Error attaching device data\n");
1058 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
1063 dev
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1064 device_release_driver(&dev
->dev
);
1070 * unbind _ADR-Based Devices when hot removal
1072 if (dev
->flags
.bus_address
) {
1073 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
1074 dev
->parent
->ops
.unbind(dev
);
1076 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
1082 acpi_add_single_object(struct acpi_device
**child
,
1083 struct acpi_device
*parent
, acpi_handle handle
, int type
,
1084 struct acpi_bus_ops
*ops
)
1087 struct acpi_device
*device
= NULL
;
1093 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1095 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1099 device
->handle
= handle
;
1100 device
->parent
= parent
;
1101 device
->bus_ops
= *ops
; /* workround for not call .start */
1104 acpi_device_get_busid(device
, handle
, type
);
1109 * Get prior to calling acpi_bus_get_status() so we know whether
1110 * or not _STA is present. Note that we only look for object
1111 * handles -- cannot evaluate objects until we know the device is
1112 * present and properly initialized.
1114 result
= acpi_bus_get_flags(device
);
1121 * See if the device is present. We always assume that non-Device
1122 * and non-Processor objects (e.g. thermal zones, power resources,
1123 * etc.) are present, functioning, etc. (at least when parent object
1124 * is present). Note that _STA has a different meaning for some
1125 * objects (e.g. power resources) so we need to be careful how we use
1129 case ACPI_BUS_TYPE_PROCESSOR
:
1130 case ACPI_BUS_TYPE_DEVICE
:
1131 result
= acpi_bus_get_status(device
);
1132 if (ACPI_FAILURE(result
) || !device
->status
.present
) {
1138 STRUCT_TO_INT(device
->status
) =
1139 ACPI_STA_DEVICE_PRESENT
| ACPI_STA_DEVICE_ENABLED
|
1140 ACPI_STA_DEVICE_UI
| ACPI_STA_DEVICE_FUNCTIONING
;
1147 * TBD: Synch with Core's enumeration/initialization process.
1151 * Hardware ID, Unique ID, & Bus Address
1152 * -------------------------------------
1154 acpi_device_set_id(device
, parent
, handle
, type
);
1160 if (device
->flags
.power_manageable
) {
1161 result
= acpi_bus_get_power_flags(device
);
1167 * Wakeup device management
1168 *-----------------------
1170 if (device
->flags
.wake_capable
) {
1171 result
= acpi_bus_get_wakeup_device_flags(device
);
1177 * Performance Management
1178 * ----------------------
1180 if (device
->flags
.performance_manageable
) {
1181 result
= acpi_bus_get_perf_flags(device
);
1186 if ((result
= acpi_device_set_context(device
, type
)))
1189 result
= acpi_device_register(device
, parent
);
1192 * Bind _ADR-Based Devices when hot add
1194 if (device
->flags
.bus_address
) {
1195 if (device
->parent
&& device
->parent
->ops
.bind
)
1196 device
->parent
->ops
.bind(device
);
1203 kfree(device
->pnp
.cid_list
);
1210 static int acpi_bus_scan(struct acpi_device
*start
, struct acpi_bus_ops
*ops
)
1212 acpi_status status
= AE_OK
;
1213 struct acpi_device
*parent
= NULL
;
1214 struct acpi_device
*child
= NULL
;
1215 acpi_handle phandle
= NULL
;
1216 acpi_handle chandle
= NULL
;
1217 acpi_object_type type
= 0;
1225 phandle
= start
->handle
;
1228 * Parse through the ACPI namespace, identify all 'devices', and
1229 * create a new 'struct acpi_device' for each.
1231 while ((level
> 0) && parent
) {
1233 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1237 * If this scope is exhausted then move our way back up.
1239 if (ACPI_FAILURE(status
)) {
1242 acpi_get_parent(phandle
, &phandle
);
1244 parent
= parent
->parent
;
1248 status
= acpi_get_type(chandle
, &type
);
1249 if (ACPI_FAILURE(status
))
1253 * If this is a scope object then parse it (depth-first).
1255 if (type
== ACPI_TYPE_LOCAL_SCOPE
) {
1263 * We're only interested in objects that we consider 'devices'.
1266 case ACPI_TYPE_DEVICE
:
1267 type
= ACPI_BUS_TYPE_DEVICE
;
1269 case ACPI_TYPE_PROCESSOR
:
1270 type
= ACPI_BUS_TYPE_PROCESSOR
;
1272 case ACPI_TYPE_THERMAL
:
1273 type
= ACPI_BUS_TYPE_THERMAL
;
1275 case ACPI_TYPE_POWER
:
1276 type
= ACPI_BUS_TYPE_POWER
;
1282 if (ops
->acpi_op_add
)
1283 status
= acpi_add_single_object(&child
, parent
,
1284 chandle
, type
, ops
);
1286 status
= acpi_bus_get_device(chandle
, &child
);
1288 if (ACPI_FAILURE(status
))
1291 if (ops
->acpi_op_start
&& !(ops
->acpi_op_add
)) {
1292 status
= acpi_start_single_object(child
);
1293 if (ACPI_FAILURE(status
))
1298 * If the device is present, enabled, and functioning then
1299 * parse its scope (depth-first). Note that we need to
1300 * represent absent devices to facilitate PnP notifications
1301 * -- but only the subtree head (not all of its children,
1302 * which will be enumerated when the parent is inserted).
1304 * TBD: Need notifications and other detection mechanisms
1305 * in place before we can fully implement this.
1307 if (child
->status
.present
) {
1308 status
= acpi_get_next_object(ACPI_TYPE_ANY
, chandle
,
1310 if (ACPI_SUCCESS(status
)) {
1323 acpi_bus_add(struct acpi_device
**child
,
1324 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1327 struct acpi_bus_ops ops
;
1329 memset(&ops
, 0, sizeof(ops
));
1330 ops
.acpi_op_add
= 1;
1332 result
= acpi_add_single_object(child
, parent
, handle
, type
, &ops
);
1334 result
= acpi_bus_scan(*child
, &ops
);
1339 EXPORT_SYMBOL(acpi_bus_add
);
1341 int acpi_bus_start(struct acpi_device
*device
)
1344 struct acpi_bus_ops ops
;
1350 result
= acpi_start_single_object(device
);
1352 memset(&ops
, 0, sizeof(ops
));
1353 ops
.acpi_op_start
= 1;
1354 result
= acpi_bus_scan(device
, &ops
);
1359 EXPORT_SYMBOL(acpi_bus_start
);
1361 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1364 struct acpi_device
*parent
, *child
;
1365 acpi_handle phandle
, chandle
;
1366 acpi_object_type type
;
1371 phandle
= start
->handle
;
1372 child
= chandle
= NULL
;
1374 while ((level
> 0) && parent
&& (!err
)) {
1375 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1379 * If this scope is exhausted then move our way back up.
1381 if (ACPI_FAILURE(status
)) {
1384 acpi_get_parent(phandle
, &phandle
);
1386 parent
= parent
->parent
;
1389 err
= acpi_bus_remove(child
, rmdevice
);
1391 err
= acpi_bus_remove(child
, 1);
1396 status
= acpi_get_type(chandle
, &type
);
1397 if (ACPI_FAILURE(status
)) {
1401 * If there is a device corresponding to chandle then
1402 * parse it (depth-first).
1404 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1414 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1417 static int acpi_bus_scan_fixed(struct acpi_device
*root
)
1420 struct acpi_device
*device
= NULL
;
1421 struct acpi_bus_ops ops
;
1426 memset(&ops
, 0, sizeof(ops
));
1427 ops
.acpi_op_add
= 1;
1428 ops
.acpi_op_start
= 1;
1431 * Enumerate all fixed-feature devices.
1433 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1434 result
= acpi_add_single_object(&device
, acpi_root
,
1436 ACPI_BUS_TYPE_POWER_BUTTON
,
1440 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1441 result
= acpi_add_single_object(&device
, acpi_root
,
1443 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1450 static int __init
acpi_scan_init(void)
1453 struct acpi_bus_ops ops
;
1459 memset(&ops
, 0, sizeof(ops
));
1460 ops
.acpi_op_add
= 1;
1461 ops
.acpi_op_start
= 1;
1463 result
= bus_register(&acpi_bus_type
);
1465 /* We don't want to quit even if we failed to add suspend/resume */
1466 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1470 * Create the root device in the bus's device tree
1472 result
= acpi_add_single_object(&acpi_root
, NULL
, ACPI_ROOT_OBJECT
,
1473 ACPI_BUS_TYPE_SYSTEM
, &ops
);
1478 * Enumerate devices in the ACPI namespace.
1480 result
= acpi_bus_scan_fixed(acpi_root
);
1482 result
= acpi_bus_scan(acpi_root
, &ops
);
1485 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);
1491 subsys_initcall(acpi_scan_init
);