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 "ACPI_BUS"
20 #define ACPI_BUS_DRIVER_NAME "ACPI Bus Driver"
21 #define ACPI_BUS_DEVICE_NAME "System Bus"
23 static LIST_HEAD(acpi_device_list
);
24 DEFINE_SPINLOCK(acpi_device_lock
);
25 LIST_HEAD(acpi_wakeup_device_list
);
28 static void acpi_device_release_legacy(struct kobject
*kobj
)
30 struct acpi_device
*dev
= container_of(kobj
, struct acpi_device
, kobj
);
31 kfree(dev
->pnp
.cid_list
);
35 struct acpi_device_attribute
{
36 struct attribute attr
;
37 ssize_t(*show
) (struct acpi_device
*, char *);
38 ssize_t(*store
) (struct acpi_device
*, const char *, size_t);
41 typedef void acpi_device_sysfs_files(struct kobject
*,
42 const struct attribute
*);
44 static void setup_sys_fs_device_files(struct acpi_device
*dev
,
45 acpi_device_sysfs_files
* func
);
47 #define create_sysfs_device_files(dev) \
48 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
49 #define remove_sysfs_device_files(dev) \
50 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
52 #define to_acpi_dev(n) container_of(n, struct acpi_device, kobj)
53 #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
55 static ssize_t
acpi_device_attr_show(struct kobject
*kobj
,
56 struct attribute
*attr
, char *buf
)
58 struct acpi_device
*device
= to_acpi_dev(kobj
);
59 struct acpi_device_attribute
*attribute
= to_handle_attr(attr
);
60 return attribute
->show
? attribute
->show(device
, buf
) : -EIO
;
62 static ssize_t
acpi_device_attr_store(struct kobject
*kobj
,
63 struct attribute
*attr
, const char *buf
,
66 struct acpi_device
*device
= to_acpi_dev(kobj
);
67 struct acpi_device_attribute
*attribute
= to_handle_attr(attr
);
68 return attribute
->store
? attribute
->store(device
, buf
, len
) : -EIO
;
71 static struct sysfs_ops acpi_device_sysfs_ops
= {
72 .show
= acpi_device_attr_show
,
73 .store
= acpi_device_attr_store
,
76 static struct kobj_type ktype_acpi_ns
= {
77 .sysfs_ops
= &acpi_device_sysfs_ops
,
78 .release
= acpi_device_release_legacy
,
81 static int namespace_uevent(struct kset
*kset
, struct kobject
*kobj
,
82 char **envp
, int num_envp
, char *buffer
,
85 struct acpi_device
*dev
= to_acpi_dev(kobj
);
92 if (add_uevent_var(envp
, num_envp
, &i
, buffer
, buffer_size
, &len
,
93 "PHYSDEVDRIVER=%s", dev
->driver
->name
))
101 static struct kset_uevent_ops namespace_uevent_ops
= {
102 .uevent
= &namespace_uevent
,
105 static struct kset acpi_namespace_kset
= {
109 .subsys
= &acpi_subsys
,
110 .ktype
= &ktype_acpi_ns
,
111 .uevent_ops
= &namespace_uevent_ops
,
114 /* --------------------------------------------------------------------------
115 ACPI sysfs device file support
116 -------------------------------------------------------------------------- */
117 static ssize_t
acpi_eject_store(struct acpi_device
*device
,
118 const char *buf
, size_t count
);
120 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
121 static struct acpi_device_attribute acpi_device_attr_##_name = \
122 __ATTR(_name, _mode, _show, _store)
124 ACPI_DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
127 * setup_sys_fs_device_files - sets up the device files under device namespace
128 * @dev: acpi_device object
129 * @func: function pointer to create or destroy the device file
132 setup_sys_fs_device_files(struct acpi_device
*dev
,
133 acpi_device_sysfs_files
* func
)
136 acpi_handle temp
= NULL
;
139 * If device has _EJ0, 'eject' file is created that is used to trigger
140 * hot-removal function from userland.
142 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
143 if (ACPI_SUCCESS(status
))
144 (*(func
)) (&dev
->kobj
, &acpi_device_attr_eject
.attr
);
147 static int acpi_eject_operation(acpi_handle handle
, int lockable
)
149 struct acpi_object_list arg_list
;
150 union acpi_object arg
;
151 acpi_status status
= AE_OK
;
154 * TBD: evaluate _PS3?
159 arg_list
.pointer
= &arg
;
160 arg
.type
= ACPI_TYPE_INTEGER
;
161 arg
.integer
.value
= 0;
162 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
166 arg_list
.pointer
= &arg
;
167 arg
.type
= ACPI_TYPE_INTEGER
;
168 arg
.integer
.value
= 1;
174 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
175 if (ACPI_FAILURE(status
)) {
183 acpi_eject_store(struct acpi_device
*device
, const char *buf
, size_t count
)
190 acpi_object_type type
= 0;
192 if ((!count
) || (buf
[0] != '1')) {
196 if (device
->driver
== NULL
) {
201 status
= acpi_get_type(device
->handle
, &type
);
202 if (ACPI_FAILURE(status
) || (!device
->flags
.ejectable
)) {
207 islockable
= device
->flags
.lockable
;
208 handle
= device
->handle
;
210 result
= acpi_bus_trim(device
, 1);
213 result
= acpi_eject_operation(handle
, islockable
);
222 /* --------------------------------------------------------------------------
224 -------------------------------------------------------------------------- */
225 static void acpi_device_release(struct device
*dev
)
227 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
229 kfree(acpi_dev
->pnp
.cid_list
);
233 static int acpi_device_suspend(struct device
*dev
, pm_message_t state
)
235 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
236 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
238 if (acpi_drv
&& acpi_drv
->ops
.suspend
)
239 return acpi_drv
->ops
.suspend(acpi_dev
, state
);
243 static int acpi_device_resume(struct device
*dev
)
245 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
246 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
248 if (acpi_drv
&& acpi_drv
->ops
.resume
)
249 return acpi_drv
->ops
.resume(acpi_dev
);
253 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
255 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
256 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
258 if (acpi_drv
->ops
.match
)
259 return !acpi_drv
->ops
.match(acpi_dev
, acpi_drv
);
260 return !acpi_match_ids(acpi_dev
, acpi_drv
->ids
);
263 static int acpi_device_uevent(struct device
*dev
, char **envp
, int num_envp
,
264 char *buffer
, int buffer_size
)
266 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
267 int i
= 0, length
= 0, ret
= 0;
269 if (acpi_dev
->flags
.hardware_id
)
270 ret
= add_uevent_var(envp
, num_envp
, &i
,
271 buffer
, buffer_size
, &length
,
272 "HWID=%s", acpi_dev
->pnp
.hardware_id
);
275 if (acpi_dev
->flags
.compatible_ids
) {
277 struct acpi_compatible_id_list
*cid_list
;
279 cid_list
= acpi_dev
->pnp
.cid_list
;
281 for (j
= 0; j
< cid_list
->count
; j
++) {
282 ret
= add_uevent_var(envp
, num_envp
, &i
, buffer
,
283 buffer_size
, &length
, "COMPTID=%s",
284 cid_list
->id
[j
].value
);
294 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
295 static int acpi_start_single_object(struct acpi_device
*);
296 static int acpi_device_probe(struct device
* dev
)
298 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
299 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
302 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
304 acpi_start_single_object(acpi_dev
);
305 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
306 "Found driver [%s] for device [%s]\n",
307 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
313 static int acpi_device_remove(struct device
* dev
)
315 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
316 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
319 if (acpi_drv
->ops
.stop
)
320 acpi_drv
->ops
.stop(acpi_dev
, ACPI_BUS_REMOVAL_NORMAL
);
321 if (acpi_drv
->ops
.remove
)
322 acpi_drv
->ops
.remove(acpi_dev
, ACPI_BUS_REMOVAL_NORMAL
);
324 acpi_dev
->driver
= NULL
;
325 acpi_driver_data(dev
) = NULL
;
331 static void acpi_device_shutdown(struct device
*dev
)
333 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
334 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
336 if (acpi_drv
&& acpi_drv
->ops
.shutdown
)
337 acpi_drv
->ops
.shutdown(acpi_dev
);
342 static struct bus_type acpi_bus_type
= {
344 .suspend
= acpi_device_suspend
,
345 .resume
= acpi_device_resume
,
346 .shutdown
= acpi_device_shutdown
,
347 .match
= acpi_bus_match
,
348 .probe
= acpi_device_probe
,
349 .remove
= acpi_device_remove
,
350 .uevent
= acpi_device_uevent
,
353 static void acpi_device_register(struct acpi_device
*device
,
354 struct acpi_device
*parent
)
361 * Link this device to its parent and siblings.
363 INIT_LIST_HEAD(&device
->children
);
364 INIT_LIST_HEAD(&device
->node
);
365 INIT_LIST_HEAD(&device
->g_list
);
366 INIT_LIST_HEAD(&device
->wakeup_list
);
368 spin_lock(&acpi_device_lock
);
369 if (device
->parent
) {
370 list_add_tail(&device
->node
, &device
->parent
->children
);
371 list_add_tail(&device
->g_list
, &device
->parent
->g_list
);
373 list_add_tail(&device
->g_list
, &acpi_device_list
);
374 if (device
->wakeup
.flags
.valid
)
375 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
376 spin_unlock(&acpi_device_lock
);
378 strlcpy(device
->kobj
.name
, device
->pnp
.bus_id
, KOBJ_NAME_LEN
);
380 device
->kobj
.parent
= &parent
->kobj
;
381 device
->kobj
.ktype
= &ktype_acpi_ns
;
382 device
->kobj
.kset
= &acpi_namespace_kset
;
383 err
= kobject_register(&device
->kobj
);
385 printk(KERN_WARNING
"%s: kobject_register error: %d\n",
387 create_sysfs_device_files(device
);
390 device
->dev
.parent
= &parent
->dev
;
391 device
->dev
.bus
= &acpi_bus_type
;
392 device_initialize(&device
->dev
);
393 sprintf(device
->dev
.bus_id
, "%s", device
->pnp
.bus_id
);
394 device
->dev
.release
= &acpi_device_release
;
395 device_add(&device
->dev
);
398 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
400 spin_lock(&acpi_device_lock
);
401 if (device
->parent
) {
402 list_del(&device
->node
);
403 list_del(&device
->g_list
);
405 list_del(&device
->g_list
);
407 list_del(&device
->wakeup_list
);
409 spin_unlock(&acpi_device_lock
);
411 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
412 remove_sysfs_device_files(device
);
413 kobject_unregister(&device
->kobj
);
415 device_unregister(&device
->dev
);
418 /* --------------------------------------------------------------------------
420 -------------------------------------------------------------------------- */
422 * acpi_bus_driver_init - add a device to a driver
423 * @device: the device to add and initialize
424 * @driver: driver for the device
426 * Used to initialize a device via its device driver. Called whenever a
427 * driver is bound to a device. Invokes the driver's add() ops.
430 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
435 if (!device
|| !driver
)
438 if (!driver
->ops
.add
)
441 result
= driver
->ops
.add(device
);
443 device
->driver
= NULL
;
444 acpi_driver_data(device
) = NULL
;
448 device
->driver
= driver
;
451 * TBD - Configuration Management: Assign resources to device based
452 * upon possible configuration and currently allocated resources.
455 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
456 "Driver successfully bound to device\n"));
460 static int acpi_start_single_object(struct acpi_device
*device
)
463 struct acpi_driver
*driver
;
466 if (!(driver
= device
->driver
))
469 if (driver
->ops
.start
) {
470 result
= driver
->ops
.start(device
);
471 if (result
&& driver
->ops
.remove
)
472 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
479 * acpi_bus_register_driver - register a driver with the ACPI bus
480 * @driver: driver being registered
482 * Registers a driver with the ACPI bus. Searches the namespace for all
483 * devices that match the driver's criteria and binds. Returns zero for
484 * success or a negative error status for failure.
486 int acpi_bus_register_driver(struct acpi_driver
*driver
)
492 driver
->drv
.name
= driver
->name
;
493 driver
->drv
.bus
= &acpi_bus_type
;
494 driver
->drv
.owner
= driver
->owner
;
496 ret
= driver_register(&driver
->drv
);
500 EXPORT_SYMBOL(acpi_bus_register_driver
);
503 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
504 * @driver: driver to unregister
506 * Unregisters a driver with the ACPI bus. Searches the namespace for all
507 * devices that match the driver's criteria and unbinds.
509 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
511 driver_unregister(&driver
->drv
);
514 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
516 /* --------------------------------------------------------------------------
518 -------------------------------------------------------------------------- */
520 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
524 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
525 union acpi_object
*obj
;
527 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
528 if (ACPI_FAILURE(status
))
531 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
532 if (ACPI_SUCCESS(status
)) {
533 obj
= buffer
.pointer
;
534 status
= acpi_get_handle(NULL
, obj
->string
.pointer
, ejd
);
535 kfree(buffer
.pointer
);
539 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
541 void acpi_bus_data_handler(acpi_handle handle
, u32 function
, void *context
)
549 int acpi_match_ids(struct acpi_device
*device
, char *ids
)
551 if (device
->flags
.hardware_id
)
552 if (strstr(ids
, device
->pnp
.hardware_id
))
555 if (device
->flags
.compatible_ids
) {
556 struct acpi_compatible_id_list
*cid_list
= device
->pnp
.cid_list
;
559 /* compare multiple _CID entries against driver ids */
560 for (i
= 0; i
< cid_list
->count
; i
++) {
561 if (strstr(ids
, cid_list
->id
[i
].value
))
568 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
570 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
575 acpi_bus_extract_wakeup_device_power_package(struct acpi_device
*device
,
576 union acpi_object
*package
)
579 union acpi_object
*element
= NULL
;
581 if (!device
|| !package
|| (package
->package
.count
< 2))
582 return AE_BAD_PARAMETER
;
584 element
= &(package
->package
.elements
[0]);
586 return AE_BAD_PARAMETER
;
587 if (element
->type
== ACPI_TYPE_PACKAGE
) {
588 if ((element
->package
.count
< 2) ||
589 (element
->package
.elements
[0].type
!=
590 ACPI_TYPE_LOCAL_REFERENCE
)
591 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
593 device
->wakeup
.gpe_device
=
594 element
->package
.elements
[0].reference
.handle
;
595 device
->wakeup
.gpe_number
=
596 (u32
) element
->package
.elements
[1].integer
.value
;
597 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
598 device
->wakeup
.gpe_number
= element
->integer
.value
;
602 element
= &(package
->package
.elements
[1]);
603 if (element
->type
!= ACPI_TYPE_INTEGER
) {
606 device
->wakeup
.sleep_state
= element
->integer
.value
;
608 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
611 device
->wakeup
.resources
.count
= package
->package
.count
- 2;
612 for (i
= 0; i
< device
->wakeup
.resources
.count
; i
++) {
613 element
= &(package
->package
.elements
[i
+ 2]);
614 if (element
->type
!= ACPI_TYPE_ANY
) {
618 device
->wakeup
.resources
.handles
[i
] = element
->reference
.handle
;
624 static int acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
626 acpi_status status
= 0;
627 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
628 union acpi_object
*package
= NULL
;
632 status
= acpi_evaluate_object(device
->handle
, "_PRW", NULL
, &buffer
);
633 if (ACPI_FAILURE(status
)) {
634 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
638 package
= (union acpi_object
*)buffer
.pointer
;
639 status
= acpi_bus_extract_wakeup_device_power_package(device
, package
);
640 if (ACPI_FAILURE(status
)) {
641 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
645 kfree(buffer
.pointer
);
647 device
->wakeup
.flags
.valid
= 1;
648 /* Power button, Lid switch always enable wakeup */
649 if (!acpi_match_ids(device
, "PNP0C0D,PNP0C0C,PNP0C0E"))
650 device
->wakeup
.flags
.run_wake
= 1;
653 if (ACPI_FAILURE(status
))
654 device
->flags
.wake_capable
= 0;
658 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
660 acpi_status status
= 0;
661 acpi_handle handle
= NULL
;
666 * Power Management Flags
668 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
669 if (ACPI_SUCCESS(status
))
670 device
->power
.flags
.explicit_get
= 1;
671 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
672 if (ACPI_SUCCESS(status
))
673 device
->power
.flags
.inrush_current
= 1;
676 * Enumerate supported power management states
678 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3
; i
++) {
679 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
680 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
682 /* Evaluate "_PRx" to se if power resources are referenced */
683 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
685 if (ps
->resources
.count
) {
686 device
->power
.flags
.power_resources
= 1;
690 /* Evaluate "_PSx" to see if we can do explicit sets */
691 object_name
[2] = 'S';
692 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
693 if (ACPI_SUCCESS(status
)) {
694 ps
->flags
.explicit_set
= 1;
698 /* State is valid if we have some power control */
699 if (ps
->resources
.count
|| ps
->flags
.explicit_set
)
702 ps
->power
= -1; /* Unknown - driver assigned */
703 ps
->latency
= -1; /* Unknown - driver assigned */
706 /* Set defaults for D0 and D3 states (always valid) */
707 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
708 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
709 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
710 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
712 /* TBD: System wake support and resource requirements. */
714 device
->power
.state
= ACPI_STATE_UNKNOWN
;
719 static int acpi_bus_get_flags(struct acpi_device
*device
)
721 acpi_status status
= AE_OK
;
722 acpi_handle temp
= NULL
;
725 /* Presence of _STA indicates 'dynamic_status' */
726 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
727 if (ACPI_SUCCESS(status
))
728 device
->flags
.dynamic_status
= 1;
730 /* Presence of _CID indicates 'compatible_ids' */
731 status
= acpi_get_handle(device
->handle
, "_CID", &temp
);
732 if (ACPI_SUCCESS(status
))
733 device
->flags
.compatible_ids
= 1;
735 /* Presence of _RMV indicates 'removable' */
736 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
737 if (ACPI_SUCCESS(status
))
738 device
->flags
.removable
= 1;
740 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
741 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
742 if (ACPI_SUCCESS(status
))
743 device
->flags
.ejectable
= 1;
745 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
746 if (ACPI_SUCCESS(status
))
747 device
->flags
.ejectable
= 1;
750 /* Presence of _LCK indicates 'lockable' */
751 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
752 if (ACPI_SUCCESS(status
))
753 device
->flags
.lockable
= 1;
755 /* Presence of _PS0|_PR0 indicates 'power manageable' */
756 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
757 if (ACPI_FAILURE(status
))
758 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
759 if (ACPI_SUCCESS(status
))
760 device
->flags
.power_manageable
= 1;
762 /* Presence of _PRW indicates wake capable */
763 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
764 if (ACPI_SUCCESS(status
))
765 device
->flags
.wake_capable
= 1;
767 /* TBD: Peformance management */
772 static void acpi_device_get_busid(struct acpi_device
*device
,
773 acpi_handle handle
, int type
)
775 char bus_id
[5] = { '?', 0 };
776 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
782 * The device's Bus ID is simply the object name.
783 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
786 case ACPI_BUS_TYPE_SYSTEM
:
787 strcpy(device
->pnp
.bus_id
, "ACPI");
789 case ACPI_BUS_TYPE_POWER_BUTTON
:
790 strcpy(device
->pnp
.bus_id
, "PWRF");
792 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
793 strcpy(device
->pnp
.bus_id
, "SLPF");
796 acpi_get_name(handle
, ACPI_SINGLE_NAME
, &buffer
);
797 /* Clean up trailing underscores (if any) */
798 for (i
= 3; i
> 1; i
--) {
799 if (bus_id
[i
] == '_')
804 strcpy(device
->pnp
.bus_id
, bus_id
);
809 static void acpi_device_set_id(struct acpi_device
*device
,
810 struct acpi_device
*parent
, acpi_handle handle
,
813 struct acpi_device_info
*info
;
814 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
817 struct acpi_compatible_id_list
*cid_list
= NULL
;
821 case ACPI_BUS_TYPE_DEVICE
:
822 status
= acpi_get_object_info(handle
, &buffer
);
823 if (ACPI_FAILURE(status
)) {
824 printk("%s: Error reading device info\n", __FUNCTION__
);
828 info
= buffer
.pointer
;
829 if (info
->valid
& ACPI_VALID_HID
)
830 hid
= info
->hardware_id
.value
;
831 if (info
->valid
& ACPI_VALID_UID
)
832 uid
= info
->unique_id
.value
;
833 if (info
->valid
& ACPI_VALID_CID
)
834 cid_list
= &info
->compatibility_id
;
835 if (info
->valid
& ACPI_VALID_ADR
) {
836 device
->pnp
.bus_address
= info
->address
;
837 device
->flags
.bus_address
= 1;
840 case ACPI_BUS_TYPE_POWER
:
841 hid
= ACPI_POWER_HID
;
843 case ACPI_BUS_TYPE_PROCESSOR
:
844 hid
= ACPI_PROCESSOR_HID
;
846 case ACPI_BUS_TYPE_SYSTEM
:
847 hid
= ACPI_SYSTEM_HID
;
849 case ACPI_BUS_TYPE_THERMAL
:
850 hid
= ACPI_THERMAL_HID
;
852 case ACPI_BUS_TYPE_POWER_BUTTON
:
853 hid
= ACPI_BUTTON_HID_POWERF
;
855 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
856 hid
= ACPI_BUTTON_HID_SLEEPF
;
863 * Fix for the system root bus device -- the only root-level device.
865 if (((acpi_handle
)parent
== ACPI_ROOT_OBJECT
) && (type
== ACPI_BUS_TYPE_DEVICE
)) {
867 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
868 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
872 strcpy(device
->pnp
.hardware_id
, hid
);
873 device
->flags
.hardware_id
= 1;
876 strcpy(device
->pnp
.unique_id
, uid
);
877 device
->flags
.unique_id
= 1;
880 device
->pnp
.cid_list
= kmalloc(cid_list
->size
, GFP_KERNEL
);
881 if (device
->pnp
.cid_list
)
882 memcpy(device
->pnp
.cid_list
, cid_list
, cid_list
->size
);
884 printk(KERN_ERR
"Memory allocation error\n");
887 kfree(buffer
.pointer
);
890 static int acpi_device_set_context(struct acpi_device
*device
, int type
)
892 acpi_status status
= AE_OK
;
897 * Attach this 'struct acpi_device' to the ACPI object. This makes
898 * resolutions from handle->device very efficient. Note that we need
899 * to be careful with fixed-feature devices as they all attach to the
902 if (type
!= ACPI_BUS_TYPE_POWER_BUTTON
&&
903 type
!= ACPI_BUS_TYPE_SLEEP_BUTTON
) {
904 status
= acpi_attach_data(device
->handle
,
905 acpi_bus_data_handler
, device
);
907 if (ACPI_FAILURE(status
)) {
908 printk("Error attaching device data\n");
915 static void acpi_device_get_debug_info(struct acpi_device
*device
,
916 acpi_handle handle
, int type
)
918 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
919 char *type_string
= NULL
;
920 char name
[80] = { '?', '\0' };
921 struct acpi_buffer buffer
= { sizeof(name
), name
};
924 case ACPI_BUS_TYPE_DEVICE
:
925 type_string
= "Device";
926 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
928 case ACPI_BUS_TYPE_POWER
:
929 type_string
= "Power Resource";
930 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
932 case ACPI_BUS_TYPE_PROCESSOR
:
933 type_string
= "Processor";
934 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
936 case ACPI_BUS_TYPE_SYSTEM
:
937 type_string
= "System";
938 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
940 case ACPI_BUS_TYPE_THERMAL
:
941 type_string
= "Thermal Zone";
942 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
944 case ACPI_BUS_TYPE_POWER_BUTTON
:
945 type_string
= "Power Button";
946 sprintf(name
, "PWRB");
948 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
949 type_string
= "Sleep Button";
950 sprintf(name
, "SLPB");
954 printk(KERN_DEBUG
"Found %s %s [%p]\n", type_string
, name
, handle
);
955 #endif /*CONFIG_ACPI_DEBUG_OUTPUT */
958 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
963 device_release_driver(&dev
->dev
);
968 if (dev
->flags
.bus_address
) {
969 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
970 dev
->parent
->ops
.unbind(dev
);
973 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
979 acpi_add_single_object(struct acpi_device
**child
,
980 struct acpi_device
*parent
, acpi_handle handle
, int type
)
983 struct acpi_device
*device
= NULL
;
989 device
= kmalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
991 printk(KERN_ERR PREFIX
"Memory allocation error\n");
994 memset(device
, 0, sizeof(struct acpi_device
));
996 device
->handle
= handle
;
997 device
->parent
= parent
;
999 acpi_device_get_busid(device
, handle
, type
);
1004 * Get prior to calling acpi_bus_get_status() so we know whether
1005 * or not _STA is present. Note that we only look for object
1006 * handles -- cannot evaluate objects until we know the device is
1007 * present and properly initialized.
1009 result
= acpi_bus_get_flags(device
);
1016 * See if the device is present. We always assume that non-Device
1017 * and non-Processor objects (e.g. thermal zones, power resources,
1018 * etc.) are present, functioning, etc. (at least when parent object
1019 * is present). Note that _STA has a different meaning for some
1020 * objects (e.g. power resources) so we need to be careful how we use
1024 case ACPI_BUS_TYPE_PROCESSOR
:
1025 case ACPI_BUS_TYPE_DEVICE
:
1026 result
= acpi_bus_get_status(device
);
1027 if (ACPI_FAILURE(result
) || !device
->status
.present
) {
1033 STRUCT_TO_INT(device
->status
) = 0x0F;
1040 * TBD: Synch with Core's enumeration/initialization process.
1044 * Hardware ID, Unique ID, & Bus Address
1045 * -------------------------------------
1047 acpi_device_set_id(device
, parent
, handle
, type
);
1053 if (device
->flags
.power_manageable
) {
1054 result
= acpi_bus_get_power_flags(device
);
1060 * Wakeup device management
1061 *-----------------------
1063 if (device
->flags
.wake_capable
) {
1064 result
= acpi_bus_get_wakeup_device_flags(device
);
1070 * Performance Management
1071 * ----------------------
1073 if (device
->flags
.performance_manageable
) {
1074 result
= acpi_bus_get_perf_flags(device
);
1079 if ((result
= acpi_device_set_context(device
, type
)))
1082 acpi_device_get_debug_info(device
, handle
, type
);
1084 acpi_device_register(device
, parent
);
1087 * Bind _ADR-Based Devices
1088 * -----------------------
1089 * If there's a a bus address (_ADR) then we utilize the parent's
1090 * 'bind' function (if exists) to bind the ACPI- and natively-
1091 * enumerated device representations.
1093 if (device
->flags
.bus_address
) {
1094 if (device
->parent
&& device
->parent
->ops
.bind
)
1095 device
->parent
->ops
.bind(device
);
1102 kfree(device
->pnp
.cid_list
);
1109 static int acpi_bus_scan(struct acpi_device
*start
, struct acpi_bus_ops
*ops
)
1111 acpi_status status
= AE_OK
;
1112 struct acpi_device
*parent
= NULL
;
1113 struct acpi_device
*child
= NULL
;
1114 acpi_handle phandle
= NULL
;
1115 acpi_handle chandle
= NULL
;
1116 acpi_object_type type
= 0;
1124 phandle
= start
->handle
;
1127 * Parse through the ACPI namespace, identify all 'devices', and
1128 * create a new 'struct acpi_device' for each.
1130 while ((level
> 0) && parent
) {
1132 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1136 * If this scope is exhausted then move our way back up.
1138 if (ACPI_FAILURE(status
)) {
1141 acpi_get_parent(phandle
, &phandle
);
1143 parent
= parent
->parent
;
1147 status
= acpi_get_type(chandle
, &type
);
1148 if (ACPI_FAILURE(status
))
1152 * If this is a scope object then parse it (depth-first).
1154 if (type
== ACPI_TYPE_LOCAL_SCOPE
) {
1162 * We're only interested in objects that we consider 'devices'.
1165 case ACPI_TYPE_DEVICE
:
1166 type
= ACPI_BUS_TYPE_DEVICE
;
1168 case ACPI_TYPE_PROCESSOR
:
1169 type
= ACPI_BUS_TYPE_PROCESSOR
;
1171 case ACPI_TYPE_THERMAL
:
1172 type
= ACPI_BUS_TYPE_THERMAL
;
1174 case ACPI_TYPE_POWER
:
1175 type
= ACPI_BUS_TYPE_POWER
;
1181 if (ops
->acpi_op_add
)
1182 status
= acpi_add_single_object(&child
, parent
,
1185 status
= acpi_bus_get_device(chandle
, &child
);
1187 if (ACPI_FAILURE(status
))
1190 if (ops
->acpi_op_start
) {
1191 status
= acpi_start_single_object(child
);
1192 if (ACPI_FAILURE(status
))
1197 * If the device is present, enabled, and functioning then
1198 * parse its scope (depth-first). Note that we need to
1199 * represent absent devices to facilitate PnP notifications
1200 * -- but only the subtree head (not all of its children,
1201 * which will be enumerated when the parent is inserted).
1203 * TBD: Need notifications and other detection mechanisms
1204 * in place before we can fully implement this.
1206 if (child
->status
.present
) {
1207 status
= acpi_get_next_object(ACPI_TYPE_ANY
, chandle
,
1209 if (ACPI_SUCCESS(status
)) {
1222 acpi_bus_add(struct acpi_device
**child
,
1223 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1226 struct acpi_bus_ops ops
;
1229 result
= acpi_add_single_object(child
, parent
, handle
, type
);
1231 memset(&ops
, 0, sizeof(ops
));
1232 ops
.acpi_op_add
= 1;
1233 result
= acpi_bus_scan(*child
, &ops
);
1238 EXPORT_SYMBOL(acpi_bus_add
);
1240 int acpi_bus_start(struct acpi_device
*device
)
1243 struct acpi_bus_ops ops
;
1249 result
= acpi_start_single_object(device
);
1251 memset(&ops
, 0, sizeof(ops
));
1252 ops
.acpi_op_start
= 1;
1253 result
= acpi_bus_scan(device
, &ops
);
1258 EXPORT_SYMBOL(acpi_bus_start
);
1260 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1263 struct acpi_device
*parent
, *child
;
1264 acpi_handle phandle
, chandle
;
1265 acpi_object_type type
;
1270 phandle
= start
->handle
;
1271 child
= chandle
= NULL
;
1273 while ((level
> 0) && parent
&& (!err
)) {
1274 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1278 * If this scope is exhausted then move our way back up.
1280 if (ACPI_FAILURE(status
)) {
1283 acpi_get_parent(phandle
, &phandle
);
1285 parent
= parent
->parent
;
1288 err
= acpi_bus_remove(child
, rmdevice
);
1290 err
= acpi_bus_remove(child
, 1);
1295 status
= acpi_get_type(chandle
, &type
);
1296 if (ACPI_FAILURE(status
)) {
1300 * If there is a device corresponding to chandle then
1301 * parse it (depth-first).
1303 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1313 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1316 static int acpi_bus_scan_fixed(struct acpi_device
*root
)
1319 struct acpi_device
*device
= NULL
;
1326 * Enumerate all fixed-feature devices.
1328 if (acpi_fadt
.pwr_button
== 0) {
1329 result
= acpi_add_single_object(&device
, acpi_root
,
1331 ACPI_BUS_TYPE_POWER_BUTTON
);
1333 result
= acpi_start_single_object(device
);
1336 if (acpi_fadt
.sleep_button
== 0) {
1337 result
= acpi_add_single_object(&device
, acpi_root
,
1339 ACPI_BUS_TYPE_SLEEP_BUTTON
);
1341 result
= acpi_start_single_object(device
);
1347 static int __init
acpi_scan_init(void)
1350 struct acpi_bus_ops ops
;
1356 result
= kset_register(&acpi_namespace_kset
);
1358 printk(KERN_ERR PREFIX
"kset_register error: %d\n", result
);
1360 result
= bus_register(&acpi_bus_type
);
1362 /* We don't want to quit even if we failed to add suspend/resume */
1363 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1367 * Create the root device in the bus's device tree
1369 result
= acpi_add_single_object(&acpi_root
, NULL
, ACPI_ROOT_OBJECT
,
1370 ACPI_BUS_TYPE_SYSTEM
);
1374 result
= acpi_start_single_object(acpi_root
);
1379 * Enumerate devices in the ACPI namespace.
1381 result
= acpi_bus_scan_fixed(acpi_root
);
1383 memset(&ops
, 0, sizeof(ops
));
1384 ops
.acpi_op_add
= 1;
1385 ops
.acpi_op_start
= 1;
1386 result
= acpi_bus_scan(acpi_root
, &ops
);
1390 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);
1396 subsys_initcall(acpi_scan_init
);