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 int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
, int size
){
42 if (!acpi_dev
->flags
.hardware_id
)
45 len
= snprintf(modalias
, size
, "acpi:%s:",
46 acpi_dev
->pnp
.hardware_id
);
47 if (len
< 0 || len
>= size
)
51 if (acpi_dev
->flags
.compatible_ids
) {
52 struct acpi_compatible_id_list
*cid_list
;
56 cid_list
= acpi_dev
->pnp
.cid_list
;
57 for (i
= 0; i
< cid_list
->count
; i
++) {
58 count
= snprintf(&modalias
[len
], size
, "%s:",
59 cid_list
->id
[i
].value
);
60 if (count
< 0 || count
>= size
) {
61 printk(KERN_ERR
"acpi: %s cid[%i] exceeds event buffer size",
62 acpi_dev
->pnp
.device_name
, i
);
75 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
76 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
79 /* Device has no HID and no CID or string is >1024 */
80 len
= create_modalias(acpi_dev
, buf
, 1024);
86 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
88 static int acpi_eject_operation(acpi_handle handle
, int lockable
)
90 struct acpi_object_list arg_list
;
91 union acpi_object arg
;
92 acpi_status status
= AE_OK
;
100 arg_list
.pointer
= &arg
;
101 arg
.type
= ACPI_TYPE_INTEGER
;
102 arg
.integer
.value
= 0;
103 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
107 arg_list
.pointer
= &arg
;
108 arg
.type
= ACPI_TYPE_INTEGER
;
109 arg
.integer
.value
= 1;
115 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
116 if (ACPI_FAILURE(status
)) {
124 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
125 const char *buf
, size_t count
)
132 acpi_object_type type
= 0;
133 struct acpi_device
*acpi_device
= to_acpi_device(d
);
135 if ((!count
) || (buf
[0] != '1')) {
139 if (acpi_device
->driver
== NULL
) {
144 status
= acpi_get_type(acpi_device
->handle
, &type
);
145 if (ACPI_FAILURE(status
) || (!acpi_device
->flags
.ejectable
)) {
150 islockable
= acpi_device
->flags
.lockable
;
151 handle
= acpi_device
->handle
;
153 result
= acpi_bus_trim(acpi_device
, 1);
156 result
= acpi_eject_operation(handle
, islockable
);
165 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
168 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
169 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
171 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.hardware_id
);
173 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
176 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
177 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
178 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
181 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
185 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
190 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
192 static int acpi_device_setup_files(struct acpi_device
*dev
)
199 * Devices gotten from FADT don't have a "path" attribute
202 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
207 if(dev
->flags
.hardware_id
) {
208 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
213 if (dev
->flags
.hardware_id
|| dev
->flags
.compatible_ids
){
214 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
220 * If device has _EJ0, 'eject' file is created that is used to trigger
221 * hot-removal function from userland.
223 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
224 if (ACPI_SUCCESS(status
))
225 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
230 static void acpi_device_remove_files(struct acpi_device
*dev
)
236 * If device has _EJ0, 'eject' file is created that is used to trigger
237 * hot-removal function from userland.
239 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
240 if (ACPI_SUCCESS(status
))
241 device_remove_file(&dev
->dev
, &dev_attr_eject
);
243 if (dev
->flags
.hardware_id
|| dev
->flags
.compatible_ids
)
244 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
246 if(dev
->flags
.hardware_id
)
247 device_remove_file(&dev
->dev
, &dev_attr_hid
);
249 device_remove_file(&dev
->dev
, &dev_attr_path
);
251 /* --------------------------------------------------------------------------
253 -------------------------------------------------------------------------- */
255 int acpi_match_device_ids(struct acpi_device
*device
,
256 const struct acpi_device_id
*ids
)
258 const struct acpi_device_id
*id
;
260 if (device
->flags
.hardware_id
) {
261 for (id
= ids
; id
->id
[0]; id
++) {
262 if (!strcmp((char*)id
->id
, device
->pnp
.hardware_id
))
267 if (device
->flags
.compatible_ids
) {
268 struct acpi_compatible_id_list
*cid_list
= device
->pnp
.cid_list
;
271 for (id
= ids
; id
->id
[0]; id
++) {
272 /* compare multiple _CID entries against driver ids */
273 for (i
= 0; i
< cid_list
->count
; i
++) {
274 if (!strcmp((char*)id
->id
,
275 cid_list
->id
[i
].value
))
283 EXPORT_SYMBOL(acpi_match_device_ids
);
285 static void acpi_device_release(struct device
*dev
)
287 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
289 kfree(acpi_dev
->pnp
.cid_list
);
293 static int acpi_device_suspend(struct device
*dev
, pm_message_t state
)
295 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
296 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
298 if (acpi_drv
&& acpi_drv
->ops
.suspend
)
299 return acpi_drv
->ops
.suspend(acpi_dev
, state
);
303 static int acpi_device_resume(struct device
*dev
)
305 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
306 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
308 if (acpi_drv
&& acpi_drv
->ops
.resume
)
309 return acpi_drv
->ops
.resume(acpi_dev
);
313 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
315 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
316 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
318 return !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
321 static int acpi_device_uevent(struct device
*dev
, char **envp
, int num_envp
,
322 char *buffer
, int buffer_size
)
324 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
326 strcpy(buffer
, "MODALIAS=");
327 if (create_modalias(acpi_dev
, buffer
+ 9, buffer_size
- 9) > 0) {
334 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
335 static int acpi_start_single_object(struct acpi_device
*);
336 static int acpi_device_probe(struct device
* dev
)
338 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
339 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
342 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
344 if (acpi_dev
->bus_ops
.acpi_op_start
)
345 acpi_start_single_object(acpi_dev
);
346 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
347 "Found driver [%s] for device [%s]\n",
348 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
354 static int acpi_device_remove(struct device
* dev
)
356 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
357 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
360 if (acpi_drv
->ops
.stop
)
361 acpi_drv
->ops
.stop(acpi_dev
, acpi_dev
->removal_type
);
362 if (acpi_drv
->ops
.remove
)
363 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
365 acpi_dev
->driver
= NULL
;
366 acpi_driver_data(dev
) = NULL
;
372 static void acpi_device_shutdown(struct device
*dev
)
374 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
375 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
377 if (acpi_drv
&& acpi_drv
->ops
.shutdown
)
378 acpi_drv
->ops
.shutdown(acpi_dev
);
383 struct bus_type acpi_bus_type
= {
385 .suspend
= acpi_device_suspend
,
386 .resume
= acpi_device_resume
,
387 .shutdown
= acpi_device_shutdown
,
388 .match
= acpi_bus_match
,
389 .probe
= acpi_device_probe
,
390 .remove
= acpi_device_remove
,
391 .uevent
= acpi_device_uevent
,
394 static int acpi_device_register(struct acpi_device
*device
,
395 struct acpi_device
*parent
)
398 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
403 * Link this device to its parent and siblings.
405 INIT_LIST_HEAD(&device
->children
);
406 INIT_LIST_HEAD(&device
->node
);
407 INIT_LIST_HEAD(&device
->g_list
);
408 INIT_LIST_HEAD(&device
->wakeup_list
);
410 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
412 printk(KERN_ERR PREFIX
"Memory allocation error\n");
416 spin_lock(&acpi_device_lock
);
418 * Find suitable bus_id and instance number in acpi_bus_id_list
419 * If failed, create one and link it into acpi_bus_id_list
421 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
422 if(!strcmp(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device")) {
423 acpi_device_bus_id
->instance_no
++;
430 acpi_device_bus_id
= new_bus_id
;
431 strcpy(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device");
432 acpi_device_bus_id
->instance_no
= 0;
433 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
435 sprintf(device
->dev
.bus_id
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
437 if (device
->parent
) {
438 list_add_tail(&device
->node
, &device
->parent
->children
);
439 list_add_tail(&device
->g_list
, &device
->parent
->g_list
);
441 list_add_tail(&device
->g_list
, &acpi_device_list
);
442 if (device
->wakeup
.flags
.valid
)
443 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
444 spin_unlock(&acpi_device_lock
);
447 device
->dev
.parent
= &parent
->dev
;
448 device
->dev
.bus
= &acpi_bus_type
;
449 device_initialize(&device
->dev
);
450 device
->dev
.release
= &acpi_device_release
;
451 result
= device_add(&device
->dev
);
453 printk("Error adding device %s", device
->dev
.bus_id
);
457 result
= acpi_device_setup_files(device
);
459 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error creating sysfs interface for device %s\n", device
->dev
.bus_id
));
461 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
464 spin_lock(&acpi_device_lock
);
465 if (device
->parent
) {
466 list_del(&device
->node
);
467 list_del(&device
->g_list
);
469 list_del(&device
->g_list
);
470 list_del(&device
->wakeup_list
);
471 spin_unlock(&acpi_device_lock
);
475 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
477 spin_lock(&acpi_device_lock
);
478 if (device
->parent
) {
479 list_del(&device
->node
);
480 list_del(&device
->g_list
);
482 list_del(&device
->g_list
);
484 list_del(&device
->wakeup_list
);
485 spin_unlock(&acpi_device_lock
);
487 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
489 acpi_device_remove_files(device
);
490 device_unregister(&device
->dev
);
493 /* --------------------------------------------------------------------------
495 -------------------------------------------------------------------------- */
497 * acpi_bus_driver_init - add a device to a driver
498 * @device: the device to add and initialize
499 * @driver: driver for the device
501 * Used to initialize a device via its device driver. Called whenever a
502 * driver is bound to a device. Invokes the driver's add() ops.
505 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
510 if (!device
|| !driver
)
513 if (!driver
->ops
.add
)
516 result
= driver
->ops
.add(device
);
518 device
->driver
= NULL
;
519 acpi_driver_data(device
) = NULL
;
523 device
->driver
= driver
;
526 * TBD - Configuration Management: Assign resources to device based
527 * upon possible configuration and currently allocated resources.
530 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
531 "Driver successfully bound to device\n"));
535 static int acpi_start_single_object(struct acpi_device
*device
)
538 struct acpi_driver
*driver
;
541 if (!(driver
= device
->driver
))
544 if (driver
->ops
.start
) {
545 result
= driver
->ops
.start(device
);
546 if (result
&& driver
->ops
.remove
)
547 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
554 * acpi_bus_register_driver - register a driver with the ACPI bus
555 * @driver: driver being registered
557 * Registers a driver with the ACPI bus. Searches the namespace for all
558 * devices that match the driver's criteria and binds. Returns zero for
559 * success or a negative error status for failure.
561 int acpi_bus_register_driver(struct acpi_driver
*driver
)
567 driver
->drv
.name
= driver
->name
;
568 driver
->drv
.bus
= &acpi_bus_type
;
569 driver
->drv
.owner
= driver
->owner
;
571 ret
= driver_register(&driver
->drv
);
575 EXPORT_SYMBOL(acpi_bus_register_driver
);
578 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
579 * @driver: driver to unregister
581 * Unregisters a driver with the ACPI bus. Searches the namespace for all
582 * devices that match the driver's criteria and unbinds.
584 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
586 driver_unregister(&driver
->drv
);
589 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
591 /* --------------------------------------------------------------------------
593 -------------------------------------------------------------------------- */
595 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
599 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
600 union acpi_object
*obj
;
602 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
603 if (ACPI_FAILURE(status
))
606 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
607 if (ACPI_SUCCESS(status
)) {
608 obj
= buffer
.pointer
;
609 status
= acpi_get_handle(NULL
, obj
->string
.pointer
, ejd
);
610 kfree(buffer
.pointer
);
614 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
616 void acpi_bus_data_handler(acpi_handle handle
, u32 function
, void *context
)
624 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
626 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
631 acpi_bus_extract_wakeup_device_power_package(struct acpi_device
*device
,
632 union acpi_object
*package
)
635 union acpi_object
*element
= NULL
;
637 if (!device
|| !package
|| (package
->package
.count
< 2))
638 return AE_BAD_PARAMETER
;
640 element
= &(package
->package
.elements
[0]);
642 return AE_BAD_PARAMETER
;
643 if (element
->type
== ACPI_TYPE_PACKAGE
) {
644 if ((element
->package
.count
< 2) ||
645 (element
->package
.elements
[0].type
!=
646 ACPI_TYPE_LOCAL_REFERENCE
)
647 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
649 device
->wakeup
.gpe_device
=
650 element
->package
.elements
[0].reference
.handle
;
651 device
->wakeup
.gpe_number
=
652 (u32
) element
->package
.elements
[1].integer
.value
;
653 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
654 device
->wakeup
.gpe_number
= element
->integer
.value
;
658 element
= &(package
->package
.elements
[1]);
659 if (element
->type
!= ACPI_TYPE_INTEGER
) {
662 device
->wakeup
.sleep_state
= element
->integer
.value
;
664 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
667 device
->wakeup
.resources
.count
= package
->package
.count
- 2;
668 for (i
= 0; i
< device
->wakeup
.resources
.count
; i
++) {
669 element
= &(package
->package
.elements
[i
+ 2]);
670 if (element
->type
!= ACPI_TYPE_ANY
) {
674 device
->wakeup
.resources
.handles
[i
] = element
->reference
.handle
;
680 static int acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
682 acpi_status status
= 0;
683 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
684 union acpi_object
*package
= NULL
;
686 struct acpi_device_id button_device_ids
[] = {
695 status
= acpi_evaluate_object(device
->handle
, "_PRW", NULL
, &buffer
);
696 if (ACPI_FAILURE(status
)) {
697 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
701 package
= (union acpi_object
*)buffer
.pointer
;
702 status
= acpi_bus_extract_wakeup_device_power_package(device
, package
);
703 if (ACPI_FAILURE(status
)) {
704 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
708 kfree(buffer
.pointer
);
710 device
->wakeup
.flags
.valid
= 1;
711 /* Power button, Lid switch always enable wakeup */
712 if (!acpi_match_device_ids(device
, button_device_ids
))
713 device
->wakeup
.flags
.run_wake
= 1;
716 if (ACPI_FAILURE(status
))
717 device
->flags
.wake_capable
= 0;
721 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
723 acpi_status status
= 0;
724 acpi_handle handle
= NULL
;
729 * Power Management Flags
731 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
732 if (ACPI_SUCCESS(status
))
733 device
->power
.flags
.explicit_get
= 1;
734 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
735 if (ACPI_SUCCESS(status
))
736 device
->power
.flags
.inrush_current
= 1;
739 * Enumerate supported power management states
741 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3
; i
++) {
742 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
743 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
745 /* Evaluate "_PRx" to se if power resources are referenced */
746 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
748 if (ps
->resources
.count
) {
749 device
->power
.flags
.power_resources
= 1;
753 /* Evaluate "_PSx" to see if we can do explicit sets */
754 object_name
[2] = 'S';
755 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
756 if (ACPI_SUCCESS(status
)) {
757 ps
->flags
.explicit_set
= 1;
761 /* State is valid if we have some power control */
762 if (ps
->resources
.count
|| ps
->flags
.explicit_set
)
765 ps
->power
= -1; /* Unknown - driver assigned */
766 ps
->latency
= -1; /* Unknown - driver assigned */
769 /* Set defaults for D0 and D3 states (always valid) */
770 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
771 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
772 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
773 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
775 /* TBD: System wake support and resource requirements. */
777 device
->power
.state
= ACPI_STATE_UNKNOWN
;
782 static int acpi_bus_get_flags(struct acpi_device
*device
)
784 acpi_status status
= AE_OK
;
785 acpi_handle temp
= NULL
;
788 /* Presence of _STA indicates 'dynamic_status' */
789 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
790 if (ACPI_SUCCESS(status
))
791 device
->flags
.dynamic_status
= 1;
793 /* Presence of _CID indicates 'compatible_ids' */
794 status
= acpi_get_handle(device
->handle
, "_CID", &temp
);
795 if (ACPI_SUCCESS(status
))
796 device
->flags
.compatible_ids
= 1;
798 /* Presence of _RMV indicates 'removable' */
799 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
800 if (ACPI_SUCCESS(status
))
801 device
->flags
.removable
= 1;
803 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
804 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
805 if (ACPI_SUCCESS(status
))
806 device
->flags
.ejectable
= 1;
808 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
809 if (ACPI_SUCCESS(status
))
810 device
->flags
.ejectable
= 1;
813 /* Presence of _LCK indicates 'lockable' */
814 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
815 if (ACPI_SUCCESS(status
))
816 device
->flags
.lockable
= 1;
818 /* Presence of _PS0|_PR0 indicates 'power manageable' */
819 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
820 if (ACPI_FAILURE(status
))
821 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
822 if (ACPI_SUCCESS(status
))
823 device
->flags
.power_manageable
= 1;
825 /* Presence of _PRW indicates wake capable */
826 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
827 if (ACPI_SUCCESS(status
))
828 device
->flags
.wake_capable
= 1;
830 /* TBD: Peformance management */
835 static void acpi_device_get_busid(struct acpi_device
*device
,
836 acpi_handle handle
, int type
)
838 char bus_id
[5] = { '?', 0 };
839 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
845 * The device's Bus ID is simply the object name.
846 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
849 case ACPI_BUS_TYPE_SYSTEM
:
850 strcpy(device
->pnp
.bus_id
, "ACPI");
852 case ACPI_BUS_TYPE_POWER_BUTTON
:
853 strcpy(device
->pnp
.bus_id
, "PWRF");
855 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
856 strcpy(device
->pnp
.bus_id
, "SLPF");
859 acpi_get_name(handle
, ACPI_SINGLE_NAME
, &buffer
);
860 /* Clean up trailing underscores (if any) */
861 for (i
= 3; i
> 1; i
--) {
862 if (bus_id
[i
] == '_')
867 strcpy(device
->pnp
.bus_id
, bus_id
);
873 acpi_video_bus_match(struct acpi_device
*device
)
875 acpi_handle h_dummy1
;
876 acpi_handle h_dummy2
;
877 acpi_handle h_dummy3
;
883 /* Since there is no HID, CID for ACPI Video drivers, we have
884 * to check well known required nodes for each feature we support.
887 /* Does this device able to support video switching ? */
888 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_DOD", &h_dummy1
)) &&
889 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_DOS", &h_dummy2
)))
892 /* Does this device able to retrieve a video ROM ? */
893 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_ROM", &h_dummy1
)))
896 /* Does this device able to configure which video head to be POSTed ? */
897 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_VPO", &h_dummy1
)) &&
898 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_GPD", &h_dummy2
)) &&
899 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_SPD", &h_dummy3
)))
906 * acpi_bay_match - see if a device is an ejectable driver bay
908 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
909 * then we can safely call it an ejectable drive bay
911 static int acpi_bay_match(struct acpi_device
*device
){
917 handle
= device
->handle
;
919 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
920 if (ACPI_FAILURE(status
))
923 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
924 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
925 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
926 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
929 if (acpi_get_parent(handle
, &phandle
))
932 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
933 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
934 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
935 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
941 static void acpi_device_set_id(struct acpi_device
*device
,
942 struct acpi_device
*parent
, acpi_handle handle
,
945 struct acpi_device_info
*info
;
946 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
949 struct acpi_compatible_id_list
*cid_list
= NULL
;
953 case ACPI_BUS_TYPE_DEVICE
:
954 status
= acpi_get_object_info(handle
, &buffer
);
955 if (ACPI_FAILURE(status
)) {
956 printk("%s: Error reading device info\n", __FUNCTION__
);
960 info
= buffer
.pointer
;
961 if (info
->valid
& ACPI_VALID_HID
)
962 hid
= info
->hardware_id
.value
;
963 if (info
->valid
& ACPI_VALID_UID
)
964 uid
= info
->unique_id
.value
;
965 if (info
->valid
& ACPI_VALID_CID
)
966 cid_list
= &info
->compatibility_id
;
967 if (info
->valid
& ACPI_VALID_ADR
) {
968 device
->pnp
.bus_address
= info
->address
;
969 device
->flags
.bus_address
= 1;
972 if(!(info
->valid
& (ACPI_VALID_HID
| ACPI_VALID_CID
))){
973 status
= acpi_video_bus_match(device
);
974 if(ACPI_SUCCESS(status
))
975 hid
= ACPI_VIDEO_HID
;
977 status
= acpi_bay_match(device
);
978 if (ACPI_SUCCESS(status
))
982 case ACPI_BUS_TYPE_POWER
:
983 hid
= ACPI_POWER_HID
;
985 case ACPI_BUS_TYPE_PROCESSOR
:
986 hid
= ACPI_PROCESSOR_HID
;
988 case ACPI_BUS_TYPE_SYSTEM
:
989 hid
= ACPI_SYSTEM_HID
;
991 case ACPI_BUS_TYPE_THERMAL
:
992 hid
= ACPI_THERMAL_HID
;
994 case ACPI_BUS_TYPE_POWER_BUTTON
:
995 hid
= ACPI_BUTTON_HID_POWERF
;
997 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
998 hid
= ACPI_BUTTON_HID_SLEEPF
;
1005 * Fix for the system root bus device -- the only root-level device.
1007 if (((acpi_handle
)parent
== ACPI_ROOT_OBJECT
) && (type
== ACPI_BUS_TYPE_DEVICE
)) {
1009 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
1010 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
1014 strcpy(device
->pnp
.hardware_id
, hid
);
1015 device
->flags
.hardware_id
= 1;
1018 strcpy(device
->pnp
.unique_id
, uid
);
1019 device
->flags
.unique_id
= 1;
1022 device
->pnp
.cid_list
= kmalloc(cid_list
->size
, GFP_KERNEL
);
1023 if (device
->pnp
.cid_list
)
1024 memcpy(device
->pnp
.cid_list
, cid_list
, cid_list
->size
);
1026 printk(KERN_ERR
"Memory allocation error\n");
1029 kfree(buffer
.pointer
);
1032 static int acpi_device_set_context(struct acpi_device
*device
, int type
)
1034 acpi_status status
= AE_OK
;
1039 * Attach this 'struct acpi_device' to the ACPI object. This makes
1040 * resolutions from handle->device very efficient. Note that we need
1041 * to be careful with fixed-feature devices as they all attach to the
1044 if (type
!= ACPI_BUS_TYPE_POWER_BUTTON
&&
1045 type
!= ACPI_BUS_TYPE_SLEEP_BUTTON
) {
1046 status
= acpi_attach_data(device
->handle
,
1047 acpi_bus_data_handler
, device
);
1049 if (ACPI_FAILURE(status
)) {
1050 printk("Error attaching device data\n");
1057 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
1062 dev
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1063 device_release_driver(&dev
->dev
);
1069 * unbind _ADR-Based Devices when hot removal
1071 if (dev
->flags
.bus_address
) {
1072 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
1073 dev
->parent
->ops
.unbind(dev
);
1075 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
1081 acpi_add_single_object(struct acpi_device
**child
,
1082 struct acpi_device
*parent
, acpi_handle handle
, int type
,
1083 struct acpi_bus_ops
*ops
)
1086 struct acpi_device
*device
= NULL
;
1092 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1094 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1098 device
->handle
= handle
;
1099 device
->parent
= parent
;
1100 device
->bus_ops
= *ops
; /* workround for not call .start */
1103 acpi_device_get_busid(device
, handle
, type
);
1108 * Get prior to calling acpi_bus_get_status() so we know whether
1109 * or not _STA is present. Note that we only look for object
1110 * handles -- cannot evaluate objects until we know the device is
1111 * present and properly initialized.
1113 result
= acpi_bus_get_flags(device
);
1120 * See if the device is present. We always assume that non-Device
1121 * and non-Processor objects (e.g. thermal zones, power resources,
1122 * etc.) are present, functioning, etc. (at least when parent object
1123 * is present). Note that _STA has a different meaning for some
1124 * objects (e.g. power resources) so we need to be careful how we use
1128 case ACPI_BUS_TYPE_PROCESSOR
:
1129 case ACPI_BUS_TYPE_DEVICE
:
1130 result
= acpi_bus_get_status(device
);
1131 if (ACPI_FAILURE(result
) || !device
->status
.present
) {
1137 STRUCT_TO_INT(device
->status
) =
1138 ACPI_STA_DEVICE_PRESENT
| ACPI_STA_DEVICE_ENABLED
|
1139 ACPI_STA_DEVICE_UI
| ACPI_STA_DEVICE_FUNCTIONING
;
1146 * TBD: Synch with Core's enumeration/initialization process.
1150 * Hardware ID, Unique ID, & Bus Address
1151 * -------------------------------------
1153 acpi_device_set_id(device
, parent
, handle
, type
);
1159 if (device
->flags
.power_manageable
) {
1160 result
= acpi_bus_get_power_flags(device
);
1166 * Wakeup device management
1167 *-----------------------
1169 if (device
->flags
.wake_capable
) {
1170 result
= acpi_bus_get_wakeup_device_flags(device
);
1176 * Performance Management
1177 * ----------------------
1179 if (device
->flags
.performance_manageable
) {
1180 result
= acpi_bus_get_perf_flags(device
);
1185 if ((result
= acpi_device_set_context(device
, type
)))
1188 result
= acpi_device_register(device
, parent
);
1191 * Bind _ADR-Based Devices when hot add
1193 if (device
->flags
.bus_address
) {
1194 if (device
->parent
&& device
->parent
->ops
.bind
)
1195 device
->parent
->ops
.bind(device
);
1202 kfree(device
->pnp
.cid_list
);
1209 static int acpi_bus_scan(struct acpi_device
*start
, struct acpi_bus_ops
*ops
)
1211 acpi_status status
= AE_OK
;
1212 struct acpi_device
*parent
= NULL
;
1213 struct acpi_device
*child
= NULL
;
1214 acpi_handle phandle
= NULL
;
1215 acpi_handle chandle
= NULL
;
1216 acpi_object_type type
= 0;
1224 phandle
= start
->handle
;
1227 * Parse through the ACPI namespace, identify all 'devices', and
1228 * create a new 'struct acpi_device' for each.
1230 while ((level
> 0) && parent
) {
1232 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1236 * If this scope is exhausted then move our way back up.
1238 if (ACPI_FAILURE(status
)) {
1241 acpi_get_parent(phandle
, &phandle
);
1243 parent
= parent
->parent
;
1247 status
= acpi_get_type(chandle
, &type
);
1248 if (ACPI_FAILURE(status
))
1252 * If this is a scope object then parse it (depth-first).
1254 if (type
== ACPI_TYPE_LOCAL_SCOPE
) {
1262 * We're only interested in objects that we consider 'devices'.
1265 case ACPI_TYPE_DEVICE
:
1266 type
= ACPI_BUS_TYPE_DEVICE
;
1268 case ACPI_TYPE_PROCESSOR
:
1269 type
= ACPI_BUS_TYPE_PROCESSOR
;
1271 case ACPI_TYPE_THERMAL
:
1272 type
= ACPI_BUS_TYPE_THERMAL
;
1274 case ACPI_TYPE_POWER
:
1275 type
= ACPI_BUS_TYPE_POWER
;
1281 if (ops
->acpi_op_add
)
1282 status
= acpi_add_single_object(&child
, parent
,
1283 chandle
, type
, ops
);
1285 status
= acpi_bus_get_device(chandle
, &child
);
1287 if (ACPI_FAILURE(status
))
1290 if (ops
->acpi_op_start
&& !(ops
->acpi_op_add
)) {
1291 status
= acpi_start_single_object(child
);
1292 if (ACPI_FAILURE(status
))
1297 * If the device is present, enabled, and functioning then
1298 * parse its scope (depth-first). Note that we need to
1299 * represent absent devices to facilitate PnP notifications
1300 * -- but only the subtree head (not all of its children,
1301 * which will be enumerated when the parent is inserted).
1303 * TBD: Need notifications and other detection mechanisms
1304 * in place before we can fully implement this.
1306 if (child
->status
.present
) {
1307 status
= acpi_get_next_object(ACPI_TYPE_ANY
, chandle
,
1309 if (ACPI_SUCCESS(status
)) {
1322 acpi_bus_add(struct acpi_device
**child
,
1323 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1326 struct acpi_bus_ops ops
;
1328 memset(&ops
, 0, sizeof(ops
));
1329 ops
.acpi_op_add
= 1;
1331 result
= acpi_add_single_object(child
, parent
, handle
, type
, &ops
);
1333 result
= acpi_bus_scan(*child
, &ops
);
1338 EXPORT_SYMBOL(acpi_bus_add
);
1340 int acpi_bus_start(struct acpi_device
*device
)
1343 struct acpi_bus_ops ops
;
1349 result
= acpi_start_single_object(device
);
1351 memset(&ops
, 0, sizeof(ops
));
1352 ops
.acpi_op_start
= 1;
1353 result
= acpi_bus_scan(device
, &ops
);
1358 EXPORT_SYMBOL(acpi_bus_start
);
1360 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1363 struct acpi_device
*parent
, *child
;
1364 acpi_handle phandle
, chandle
;
1365 acpi_object_type type
;
1370 phandle
= start
->handle
;
1371 child
= chandle
= NULL
;
1373 while ((level
> 0) && parent
&& (!err
)) {
1374 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1378 * If this scope is exhausted then move our way back up.
1380 if (ACPI_FAILURE(status
)) {
1383 acpi_get_parent(phandle
, &phandle
);
1385 parent
= parent
->parent
;
1388 err
= acpi_bus_remove(child
, rmdevice
);
1390 err
= acpi_bus_remove(child
, 1);
1395 status
= acpi_get_type(chandle
, &type
);
1396 if (ACPI_FAILURE(status
)) {
1400 * If there is a device corresponding to chandle then
1401 * parse it (depth-first).
1403 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1413 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1416 static int acpi_bus_scan_fixed(struct acpi_device
*root
)
1419 struct acpi_device
*device
= NULL
;
1420 struct acpi_bus_ops ops
;
1425 memset(&ops
, 0, sizeof(ops
));
1426 ops
.acpi_op_add
= 1;
1427 ops
.acpi_op_start
= 1;
1430 * Enumerate all fixed-feature devices.
1432 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1433 result
= acpi_add_single_object(&device
, acpi_root
,
1435 ACPI_BUS_TYPE_POWER_BUTTON
,
1439 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1440 result
= acpi_add_single_object(&device
, acpi_root
,
1442 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1449 static int __init
acpi_scan_init(void)
1452 struct acpi_bus_ops ops
;
1458 memset(&ops
, 0, sizeof(ops
));
1459 ops
.acpi_op_add
= 1;
1460 ops
.acpi_op_start
= 1;
1462 result
= bus_register(&acpi_bus_type
);
1464 /* We don't want to quit even if we failed to add suspend/resume */
1465 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1469 * Create the root device in the bus's device tree
1471 result
= acpi_add_single_object(&acpi_root
, NULL
, ACPI_ROOT_OBJECT
,
1472 ACPI_BUS_TYPE_SYSTEM
, &ops
);
1477 * Enumerate devices in the ACPI namespace.
1479 result
= acpi_bus_scan_fixed(acpi_root
);
1481 result
= acpi_bus_scan(acpi_root
, &ops
);
1484 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);
1490 subsys_initcall(acpi_scan_init
);