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 static LIST_HEAD(acpi_bus_id_list
);
25 DEFINE_SPINLOCK(acpi_device_lock
);
26 LIST_HEAD(acpi_wakeup_device_list
);
28 struct acpi_device_bus_id
{
30 unsigned int instance_no
;
31 struct list_head node
;
33 static int acpi_eject_operation(acpi_handle handle
, int lockable
)
35 struct acpi_object_list arg_list
;
36 union acpi_object arg
;
37 acpi_status status
= AE_OK
;
45 arg_list
.pointer
= &arg
;
46 arg
.type
= ACPI_TYPE_INTEGER
;
47 arg
.integer
.value
= 0;
48 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
52 arg_list
.pointer
= &arg
;
53 arg
.type
= ACPI_TYPE_INTEGER
;
54 arg
.integer
.value
= 1;
60 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
61 if (ACPI_FAILURE(status
)) {
69 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
70 const char *buf
, size_t count
)
77 acpi_object_type type
= 0;
78 struct acpi_device
*acpi_device
= to_acpi_device(d
);
80 if ((!count
) || (buf
[0] != '1')) {
84 if (acpi_device
->driver
== NULL
) {
89 status
= acpi_get_type(acpi_device
->handle
, &type
);
90 if (ACPI_FAILURE(status
) || (!acpi_device
->flags
.ejectable
)) {
95 islockable
= acpi_device
->flags
.lockable
;
96 handle
= acpi_device
->handle
;
98 result
= acpi_bus_trim(acpi_device
, 1);
101 result
= acpi_eject_operation(handle
, islockable
);
110 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
113 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
114 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
116 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.hardware_id
);
118 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
121 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
122 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
123 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
126 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
130 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
135 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
137 static int acpi_device_setup_files(struct acpi_device
*dev
)
144 * Devices gotten from FADT don't have a "path" attribute
147 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
152 if(dev
->flags
.hardware_id
) {
153 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
159 * If device has _EJ0, 'eject' file is created that is used to trigger
160 * hot-removal function from userland.
162 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
163 if (ACPI_SUCCESS(status
))
164 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
169 static void acpi_device_remove_files(struct acpi_device
*dev
)
175 * If device has _EJ0, 'eject' file is created that is used to trigger
176 * hot-removal function from userland.
178 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
179 if (ACPI_SUCCESS(status
))
180 device_remove_file(&dev
->dev
, &dev_attr_eject
);
182 if(dev
->flags
.hardware_id
)
183 device_remove_file(&dev
->dev
, &dev_attr_hid
);
185 device_remove_file(&dev
->dev
, &dev_attr_path
);
187 /* --------------------------------------------------------------------------
189 -------------------------------------------------------------------------- */
190 static void acpi_device_release(struct device
*dev
)
192 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
194 kfree(acpi_dev
->pnp
.cid_list
);
198 static int acpi_device_suspend(struct device
*dev
, pm_message_t state
)
200 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
201 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
203 if (acpi_drv
&& acpi_drv
->ops
.suspend
)
204 return acpi_drv
->ops
.suspend(acpi_dev
, state
);
208 static int acpi_device_resume(struct device
*dev
)
210 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
211 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
213 if (acpi_drv
&& acpi_drv
->ops
.resume
)
214 return acpi_drv
->ops
.resume(acpi_dev
);
218 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
220 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
221 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
223 return !acpi_match_ids(acpi_dev
, acpi_drv
->ids
);
226 static int acpi_device_uevent(struct device
*dev
, char **envp
, int num_envp
,
227 char *buffer
, int buffer_size
)
229 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
230 int i
= 0, length
= 0, ret
= 0;
232 if (acpi_dev
->flags
.hardware_id
)
233 ret
= add_uevent_var(envp
, num_envp
, &i
,
234 buffer
, buffer_size
, &length
,
235 "HWID=%s", acpi_dev
->pnp
.hardware_id
);
238 if (acpi_dev
->flags
.compatible_ids
) {
240 struct acpi_compatible_id_list
*cid_list
;
242 cid_list
= acpi_dev
->pnp
.cid_list
;
244 for (j
= 0; j
< cid_list
->count
; j
++) {
245 ret
= add_uevent_var(envp
, num_envp
, &i
, buffer
,
246 buffer_size
, &length
, "COMPTID=%s",
247 cid_list
->id
[j
].value
);
257 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
258 static int acpi_start_single_object(struct acpi_device
*);
259 static int acpi_device_probe(struct device
* dev
)
261 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
262 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
265 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
267 if (acpi_dev
->bus_ops
.acpi_op_start
)
268 acpi_start_single_object(acpi_dev
);
269 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
270 "Found driver [%s] for device [%s]\n",
271 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
277 static int acpi_device_remove(struct device
* dev
)
279 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
280 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
283 if (acpi_drv
->ops
.stop
)
284 acpi_drv
->ops
.stop(acpi_dev
, acpi_dev
->removal_type
);
285 if (acpi_drv
->ops
.remove
)
286 acpi_drv
->ops
.remove(acpi_dev
, acpi_dev
->removal_type
);
288 acpi_dev
->driver
= NULL
;
289 acpi_driver_data(dev
) = NULL
;
295 static void acpi_device_shutdown(struct device
*dev
)
297 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
298 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
300 if (acpi_drv
&& acpi_drv
->ops
.shutdown
)
301 acpi_drv
->ops
.shutdown(acpi_dev
);
306 static struct bus_type acpi_bus_type
= {
308 .suspend
= acpi_device_suspend
,
309 .resume
= acpi_device_resume
,
310 .shutdown
= acpi_device_shutdown
,
311 .match
= acpi_bus_match
,
312 .probe
= acpi_device_probe
,
313 .remove
= acpi_device_remove
,
314 .uevent
= acpi_device_uevent
,
317 static int acpi_device_register(struct acpi_device
*device
,
318 struct acpi_device
*parent
)
321 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
326 * Link this device to its parent and siblings.
328 INIT_LIST_HEAD(&device
->children
);
329 INIT_LIST_HEAD(&device
->node
);
330 INIT_LIST_HEAD(&device
->g_list
);
331 INIT_LIST_HEAD(&device
->wakeup_list
);
333 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
335 printk(KERN_ERR PREFIX
"Memory allocation error\n");
339 spin_lock(&acpi_device_lock
);
341 * Find suitable bus_id and instance number in acpi_bus_id_list
342 * If failed, create one and link it into acpi_bus_id_list
344 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
345 if(!strcmp(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device")) {
346 acpi_device_bus_id
->instance_no
++;
353 acpi_device_bus_id
= new_bus_id
;
354 strcpy(acpi_device_bus_id
->bus_id
, device
->flags
.hardware_id
? device
->pnp
.hardware_id
: "device");
355 acpi_device_bus_id
->instance_no
= 0;
356 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
358 sprintf(device
->dev
.bus_id
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
360 if (device
->parent
) {
361 list_add_tail(&device
->node
, &device
->parent
->children
);
362 list_add_tail(&device
->g_list
, &device
->parent
->g_list
);
364 list_add_tail(&device
->g_list
, &acpi_device_list
);
365 if (device
->wakeup
.flags
.valid
)
366 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
367 spin_unlock(&acpi_device_lock
);
370 device
->dev
.parent
= &parent
->dev
;
371 device
->dev
.bus
= &acpi_bus_type
;
372 device_initialize(&device
->dev
);
373 device
->dev
.release
= &acpi_device_release
;
374 result
= device_add(&device
->dev
);
376 printk("Error adding device %s", device
->dev
.bus_id
);
380 result
= acpi_device_setup_files(device
);
382 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error creating sysfs interface for device %s\n", device
->dev
.bus_id
));
384 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
387 spin_lock(&acpi_device_lock
);
388 if (device
->parent
) {
389 list_del(&device
->node
);
390 list_del(&device
->g_list
);
392 list_del(&device
->g_list
);
393 list_del(&device
->wakeup_list
);
394 spin_unlock(&acpi_device_lock
);
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
);
408 spin_unlock(&acpi_device_lock
);
410 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
412 acpi_device_remove_files(device
);
413 device_unregister(&device
->dev
);
416 /* --------------------------------------------------------------------------
418 -------------------------------------------------------------------------- */
420 * acpi_bus_driver_init - add a device to a driver
421 * @device: the device to add and initialize
422 * @driver: driver for the device
424 * Used to initialize a device via its device driver. Called whenever a
425 * driver is bound to a device. Invokes the driver's add() ops.
428 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
433 if (!device
|| !driver
)
436 if (!driver
->ops
.add
)
439 result
= driver
->ops
.add(device
);
441 device
->driver
= NULL
;
442 acpi_driver_data(device
) = NULL
;
446 device
->driver
= driver
;
449 * TBD - Configuration Management: Assign resources to device based
450 * upon possible configuration and currently allocated resources.
453 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
454 "Driver successfully bound to device\n"));
458 static int acpi_start_single_object(struct acpi_device
*device
)
461 struct acpi_driver
*driver
;
464 if (!(driver
= device
->driver
))
467 if (driver
->ops
.start
) {
468 result
= driver
->ops
.start(device
);
469 if (result
&& driver
->ops
.remove
)
470 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
477 * acpi_bus_register_driver - register a driver with the ACPI bus
478 * @driver: driver being registered
480 * Registers a driver with the ACPI bus. Searches the namespace for all
481 * devices that match the driver's criteria and binds. Returns zero for
482 * success or a negative error status for failure.
484 int acpi_bus_register_driver(struct acpi_driver
*driver
)
490 driver
->drv
.name
= driver
->name
;
491 driver
->drv
.bus
= &acpi_bus_type
;
492 driver
->drv
.owner
= driver
->owner
;
494 ret
= driver_register(&driver
->drv
);
498 EXPORT_SYMBOL(acpi_bus_register_driver
);
501 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
502 * @driver: driver to unregister
504 * Unregisters a driver with the ACPI bus. Searches the namespace for all
505 * devices that match the driver's criteria and unbinds.
507 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
509 driver_unregister(&driver
->drv
);
512 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
514 /* --------------------------------------------------------------------------
516 -------------------------------------------------------------------------- */
518 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
522 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
523 union acpi_object
*obj
;
525 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
526 if (ACPI_FAILURE(status
))
529 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
530 if (ACPI_SUCCESS(status
)) {
531 obj
= buffer
.pointer
;
532 status
= acpi_get_handle(NULL
, obj
->string
.pointer
, ejd
);
533 kfree(buffer
.pointer
);
537 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
539 void acpi_bus_data_handler(acpi_handle handle
, u32 function
, void *context
)
547 int acpi_match_ids(struct acpi_device
*device
, char *ids
)
549 if (device
->flags
.hardware_id
)
550 if (strstr(ids
, device
->pnp
.hardware_id
))
553 if (device
->flags
.compatible_ids
) {
554 struct acpi_compatible_id_list
*cid_list
= device
->pnp
.cid_list
;
557 /* compare multiple _CID entries against driver ids */
558 for (i
= 0; i
< cid_list
->count
; i
++) {
559 if (strstr(ids
, cid_list
->id
[i
].value
))
566 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
568 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
573 acpi_bus_extract_wakeup_device_power_package(struct acpi_device
*device
,
574 union acpi_object
*package
)
577 union acpi_object
*element
= NULL
;
579 if (!device
|| !package
|| (package
->package
.count
< 2))
580 return AE_BAD_PARAMETER
;
582 element
= &(package
->package
.elements
[0]);
584 return AE_BAD_PARAMETER
;
585 if (element
->type
== ACPI_TYPE_PACKAGE
) {
586 if ((element
->package
.count
< 2) ||
587 (element
->package
.elements
[0].type
!=
588 ACPI_TYPE_LOCAL_REFERENCE
)
589 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
591 device
->wakeup
.gpe_device
=
592 element
->package
.elements
[0].reference
.handle
;
593 device
->wakeup
.gpe_number
=
594 (u32
) element
->package
.elements
[1].integer
.value
;
595 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
596 device
->wakeup
.gpe_number
= element
->integer
.value
;
600 element
= &(package
->package
.elements
[1]);
601 if (element
->type
!= ACPI_TYPE_INTEGER
) {
604 device
->wakeup
.sleep_state
= element
->integer
.value
;
606 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
609 device
->wakeup
.resources
.count
= package
->package
.count
- 2;
610 for (i
= 0; i
< device
->wakeup
.resources
.count
; i
++) {
611 element
= &(package
->package
.elements
[i
+ 2]);
612 if (element
->type
!= ACPI_TYPE_ANY
) {
616 device
->wakeup
.resources
.handles
[i
] = element
->reference
.handle
;
622 static int acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
624 acpi_status status
= 0;
625 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
626 union acpi_object
*package
= NULL
;
630 status
= acpi_evaluate_object(device
->handle
, "_PRW", NULL
, &buffer
);
631 if (ACPI_FAILURE(status
)) {
632 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
636 package
= (union acpi_object
*)buffer
.pointer
;
637 status
= acpi_bus_extract_wakeup_device_power_package(device
, package
);
638 if (ACPI_FAILURE(status
)) {
639 ACPI_EXCEPTION((AE_INFO
, status
, "Extracting _PRW package"));
643 kfree(buffer
.pointer
);
645 device
->wakeup
.flags
.valid
= 1;
646 /* Power button, Lid switch always enable wakeup */
647 if (!acpi_match_ids(device
, "PNP0C0D,PNP0C0C,PNP0C0E"))
648 device
->wakeup
.flags
.run_wake
= 1;
651 if (ACPI_FAILURE(status
))
652 device
->flags
.wake_capable
= 0;
656 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
658 acpi_status status
= 0;
659 acpi_handle handle
= NULL
;
664 * Power Management Flags
666 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
667 if (ACPI_SUCCESS(status
))
668 device
->power
.flags
.explicit_get
= 1;
669 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
670 if (ACPI_SUCCESS(status
))
671 device
->power
.flags
.inrush_current
= 1;
674 * Enumerate supported power management states
676 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3
; i
++) {
677 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
678 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
680 /* Evaluate "_PRx" to se if power resources are referenced */
681 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
683 if (ps
->resources
.count
) {
684 device
->power
.flags
.power_resources
= 1;
688 /* Evaluate "_PSx" to see if we can do explicit sets */
689 object_name
[2] = 'S';
690 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
691 if (ACPI_SUCCESS(status
)) {
692 ps
->flags
.explicit_set
= 1;
696 /* State is valid if we have some power control */
697 if (ps
->resources
.count
|| ps
->flags
.explicit_set
)
700 ps
->power
= -1; /* Unknown - driver assigned */
701 ps
->latency
= -1; /* Unknown - driver assigned */
704 /* Set defaults for D0 and D3 states (always valid) */
705 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
706 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
707 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
708 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
710 /* TBD: System wake support and resource requirements. */
712 device
->power
.state
= ACPI_STATE_UNKNOWN
;
717 static int acpi_bus_get_flags(struct acpi_device
*device
)
719 acpi_status status
= AE_OK
;
720 acpi_handle temp
= NULL
;
723 /* Presence of _STA indicates 'dynamic_status' */
724 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
725 if (ACPI_SUCCESS(status
))
726 device
->flags
.dynamic_status
= 1;
728 /* Presence of _CID indicates 'compatible_ids' */
729 status
= acpi_get_handle(device
->handle
, "_CID", &temp
);
730 if (ACPI_SUCCESS(status
))
731 device
->flags
.compatible_ids
= 1;
733 /* Presence of _RMV indicates 'removable' */
734 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
735 if (ACPI_SUCCESS(status
))
736 device
->flags
.removable
= 1;
738 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
739 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
740 if (ACPI_SUCCESS(status
))
741 device
->flags
.ejectable
= 1;
743 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
744 if (ACPI_SUCCESS(status
))
745 device
->flags
.ejectable
= 1;
748 /* Presence of _LCK indicates 'lockable' */
749 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
750 if (ACPI_SUCCESS(status
))
751 device
->flags
.lockable
= 1;
753 /* Presence of _PS0|_PR0 indicates 'power manageable' */
754 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
755 if (ACPI_FAILURE(status
))
756 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
757 if (ACPI_SUCCESS(status
))
758 device
->flags
.power_manageable
= 1;
760 /* Presence of _PRW indicates wake capable */
761 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
762 if (ACPI_SUCCESS(status
))
763 device
->flags
.wake_capable
= 1;
765 /* TBD: Peformance management */
770 static void acpi_device_get_busid(struct acpi_device
*device
,
771 acpi_handle handle
, int type
)
773 char bus_id
[5] = { '?', 0 };
774 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
780 * The device's Bus ID is simply the object name.
781 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
784 case ACPI_BUS_TYPE_SYSTEM
:
785 strcpy(device
->pnp
.bus_id
, "ACPI");
787 case ACPI_BUS_TYPE_POWER_BUTTON
:
788 strcpy(device
->pnp
.bus_id
, "PWRF");
790 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
791 strcpy(device
->pnp
.bus_id
, "SLPF");
794 acpi_get_name(handle
, ACPI_SINGLE_NAME
, &buffer
);
795 /* Clean up trailing underscores (if any) */
796 for (i
= 3; i
> 1; i
--) {
797 if (bus_id
[i
] == '_')
802 strcpy(device
->pnp
.bus_id
, bus_id
);
808 acpi_video_bus_match(struct acpi_device
*device
)
810 acpi_handle h_dummy1
;
811 acpi_handle h_dummy2
;
812 acpi_handle h_dummy3
;
818 /* Since there is no HID, CID for ACPI Video drivers, we have
819 * to check well known required nodes for each feature we support.
822 /* Does this device able to support video switching ? */
823 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_DOD", &h_dummy1
)) &&
824 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_DOS", &h_dummy2
)))
827 /* Does this device able to retrieve a video ROM ? */
828 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_ROM", &h_dummy1
)))
831 /* Does this device able to configure which video head to be POSTed ? */
832 if (ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_VPO", &h_dummy1
)) &&
833 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_GPD", &h_dummy2
)) &&
834 ACPI_SUCCESS(acpi_get_handle(device
->handle
, "_SPD", &h_dummy3
)))
841 * acpi_bay_match - see if a device is an ejectable driver bay
843 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
844 * then we can safely call it an ejectable drive bay
846 static int acpi_bay_match(struct acpi_device
*device
){
852 handle
= device
->handle
;
854 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
855 if (ACPI_FAILURE(status
))
858 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
859 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
860 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
861 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
864 if (acpi_get_parent(handle
, &phandle
))
867 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
868 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
869 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
870 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
876 static void acpi_device_set_id(struct acpi_device
*device
,
877 struct acpi_device
*parent
, acpi_handle handle
,
880 struct acpi_device_info
*info
;
881 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
884 struct acpi_compatible_id_list
*cid_list
= NULL
;
888 case ACPI_BUS_TYPE_DEVICE
:
889 status
= acpi_get_object_info(handle
, &buffer
);
890 if (ACPI_FAILURE(status
)) {
891 printk("%s: Error reading device info\n", __FUNCTION__
);
895 info
= buffer
.pointer
;
896 if (info
->valid
& ACPI_VALID_HID
)
897 hid
= info
->hardware_id
.value
;
898 if (info
->valid
& ACPI_VALID_UID
)
899 uid
= info
->unique_id
.value
;
900 if (info
->valid
& ACPI_VALID_CID
)
901 cid_list
= &info
->compatibility_id
;
902 if (info
->valid
& ACPI_VALID_ADR
) {
903 device
->pnp
.bus_address
= info
->address
;
904 device
->flags
.bus_address
= 1;
907 if(!(info
->valid
& (ACPI_VALID_HID
| ACPI_VALID_CID
))){
908 status
= acpi_video_bus_match(device
);
909 if(ACPI_SUCCESS(status
))
910 hid
= ACPI_VIDEO_HID
;
912 status
= acpi_bay_match(device
);
913 if (ACPI_SUCCESS(status
))
917 case ACPI_BUS_TYPE_POWER
:
918 hid
= ACPI_POWER_HID
;
920 case ACPI_BUS_TYPE_PROCESSOR
:
921 hid
= ACPI_PROCESSOR_HID
;
923 case ACPI_BUS_TYPE_SYSTEM
:
924 hid
= ACPI_SYSTEM_HID
;
926 case ACPI_BUS_TYPE_THERMAL
:
927 hid
= ACPI_THERMAL_HID
;
929 case ACPI_BUS_TYPE_POWER_BUTTON
:
930 hid
= ACPI_BUTTON_HID_POWERF
;
932 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
933 hid
= ACPI_BUTTON_HID_SLEEPF
;
940 * Fix for the system root bus device -- the only root-level device.
942 if (((acpi_handle
)parent
== ACPI_ROOT_OBJECT
) && (type
== ACPI_BUS_TYPE_DEVICE
)) {
944 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
945 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
949 strcpy(device
->pnp
.hardware_id
, hid
);
950 device
->flags
.hardware_id
= 1;
953 strcpy(device
->pnp
.unique_id
, uid
);
954 device
->flags
.unique_id
= 1;
957 device
->pnp
.cid_list
= kmalloc(cid_list
->size
, GFP_KERNEL
);
958 if (device
->pnp
.cid_list
)
959 memcpy(device
->pnp
.cid_list
, cid_list
, cid_list
->size
);
961 printk(KERN_ERR
"Memory allocation error\n");
964 kfree(buffer
.pointer
);
967 static int acpi_device_set_context(struct acpi_device
*device
, int type
)
969 acpi_status status
= AE_OK
;
974 * Attach this 'struct acpi_device' to the ACPI object. This makes
975 * resolutions from handle->device very efficient. Note that we need
976 * to be careful with fixed-feature devices as they all attach to the
979 if (type
!= ACPI_BUS_TYPE_POWER_BUTTON
&&
980 type
!= ACPI_BUS_TYPE_SLEEP_BUTTON
) {
981 status
= acpi_attach_data(device
->handle
,
982 acpi_bus_data_handler
, device
);
984 if (ACPI_FAILURE(status
)) {
985 printk("Error attaching device data\n");
992 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
997 dev
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
998 device_release_driver(&dev
->dev
);
1004 * unbind _ADR-Based Devices when hot removal
1006 if (dev
->flags
.bus_address
) {
1007 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
1008 dev
->parent
->ops
.unbind(dev
);
1010 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
1016 acpi_add_single_object(struct acpi_device
**child
,
1017 struct acpi_device
*parent
, acpi_handle handle
, int type
,
1018 struct acpi_bus_ops
*ops
)
1021 struct acpi_device
*device
= NULL
;
1027 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1029 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1033 device
->handle
= handle
;
1034 device
->parent
= parent
;
1035 device
->bus_ops
= *ops
; /* workround for not call .start */
1038 acpi_device_get_busid(device
, handle
, type
);
1043 * Get prior to calling acpi_bus_get_status() so we know whether
1044 * or not _STA is present. Note that we only look for object
1045 * handles -- cannot evaluate objects until we know the device is
1046 * present and properly initialized.
1048 result
= acpi_bus_get_flags(device
);
1055 * See if the device is present. We always assume that non-Device
1056 * and non-Processor objects (e.g. thermal zones, power resources,
1057 * etc.) are present, functioning, etc. (at least when parent object
1058 * is present). Note that _STA has a different meaning for some
1059 * objects (e.g. power resources) so we need to be careful how we use
1063 case ACPI_BUS_TYPE_PROCESSOR
:
1064 case ACPI_BUS_TYPE_DEVICE
:
1065 result
= acpi_bus_get_status(device
);
1066 if (ACPI_FAILURE(result
) || !device
->status
.present
) {
1072 STRUCT_TO_INT(device
->status
) = 0x0F;
1079 * TBD: Synch with Core's enumeration/initialization process.
1083 * Hardware ID, Unique ID, & Bus Address
1084 * -------------------------------------
1086 acpi_device_set_id(device
, parent
, handle
, type
);
1092 if (device
->flags
.power_manageable
) {
1093 result
= acpi_bus_get_power_flags(device
);
1099 * Wakeup device management
1100 *-----------------------
1102 if (device
->flags
.wake_capable
) {
1103 result
= acpi_bus_get_wakeup_device_flags(device
);
1109 * Performance Management
1110 * ----------------------
1112 if (device
->flags
.performance_manageable
) {
1113 result
= acpi_bus_get_perf_flags(device
);
1118 if ((result
= acpi_device_set_context(device
, type
)))
1121 result
= acpi_device_register(device
, parent
);
1124 * Bind _ADR-Based Devices when hot add
1126 if (device
->flags
.bus_address
) {
1127 if (device
->parent
&& device
->parent
->ops
.bind
)
1128 device
->parent
->ops
.bind(device
);
1135 kfree(device
->pnp
.cid_list
);
1142 static int acpi_bus_scan(struct acpi_device
*start
, struct acpi_bus_ops
*ops
)
1144 acpi_status status
= AE_OK
;
1145 struct acpi_device
*parent
= NULL
;
1146 struct acpi_device
*child
= NULL
;
1147 acpi_handle phandle
= NULL
;
1148 acpi_handle chandle
= NULL
;
1149 acpi_object_type type
= 0;
1157 phandle
= start
->handle
;
1160 * Parse through the ACPI namespace, identify all 'devices', and
1161 * create a new 'struct acpi_device' for each.
1163 while ((level
> 0) && parent
) {
1165 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1169 * If this scope is exhausted then move our way back up.
1171 if (ACPI_FAILURE(status
)) {
1174 acpi_get_parent(phandle
, &phandle
);
1176 parent
= parent
->parent
;
1180 status
= acpi_get_type(chandle
, &type
);
1181 if (ACPI_FAILURE(status
))
1185 * If this is a scope object then parse it (depth-first).
1187 if (type
== ACPI_TYPE_LOCAL_SCOPE
) {
1195 * We're only interested in objects that we consider 'devices'.
1198 case ACPI_TYPE_DEVICE
:
1199 type
= ACPI_BUS_TYPE_DEVICE
;
1201 case ACPI_TYPE_PROCESSOR
:
1202 type
= ACPI_BUS_TYPE_PROCESSOR
;
1204 case ACPI_TYPE_THERMAL
:
1205 type
= ACPI_BUS_TYPE_THERMAL
;
1207 case ACPI_TYPE_POWER
:
1208 type
= ACPI_BUS_TYPE_POWER
;
1214 if (ops
->acpi_op_add
)
1215 status
= acpi_add_single_object(&child
, parent
,
1216 chandle
, type
, ops
);
1218 status
= acpi_bus_get_device(chandle
, &child
);
1220 if (ACPI_FAILURE(status
))
1223 if (ops
->acpi_op_start
&& !(ops
->acpi_op_add
)) {
1224 status
= acpi_start_single_object(child
);
1225 if (ACPI_FAILURE(status
))
1230 * If the device is present, enabled, and functioning then
1231 * parse its scope (depth-first). Note that we need to
1232 * represent absent devices to facilitate PnP notifications
1233 * -- but only the subtree head (not all of its children,
1234 * which will be enumerated when the parent is inserted).
1236 * TBD: Need notifications and other detection mechanisms
1237 * in place before we can fully implement this.
1239 if (child
->status
.present
) {
1240 status
= acpi_get_next_object(ACPI_TYPE_ANY
, chandle
,
1242 if (ACPI_SUCCESS(status
)) {
1255 acpi_bus_add(struct acpi_device
**child
,
1256 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1259 struct acpi_bus_ops ops
;
1261 memset(&ops
, 0, sizeof(ops
));
1262 ops
.acpi_op_add
= 1;
1264 result
= acpi_add_single_object(child
, parent
, handle
, type
, &ops
);
1266 result
= acpi_bus_scan(*child
, &ops
);
1271 EXPORT_SYMBOL(acpi_bus_add
);
1273 int acpi_bus_start(struct acpi_device
*device
)
1276 struct acpi_bus_ops ops
;
1282 result
= acpi_start_single_object(device
);
1284 memset(&ops
, 0, sizeof(ops
));
1285 ops
.acpi_op_start
= 1;
1286 result
= acpi_bus_scan(device
, &ops
);
1291 EXPORT_SYMBOL(acpi_bus_start
);
1293 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1296 struct acpi_device
*parent
, *child
;
1297 acpi_handle phandle
, chandle
;
1298 acpi_object_type type
;
1303 phandle
= start
->handle
;
1304 child
= chandle
= NULL
;
1306 while ((level
> 0) && parent
&& (!err
)) {
1307 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1311 * If this scope is exhausted then move our way back up.
1313 if (ACPI_FAILURE(status
)) {
1316 acpi_get_parent(phandle
, &phandle
);
1318 parent
= parent
->parent
;
1321 err
= acpi_bus_remove(child
, rmdevice
);
1323 err
= acpi_bus_remove(child
, 1);
1328 status
= acpi_get_type(chandle
, &type
);
1329 if (ACPI_FAILURE(status
)) {
1333 * If there is a device corresponding to chandle then
1334 * parse it (depth-first).
1336 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1346 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1349 static int acpi_bus_scan_fixed(struct acpi_device
*root
)
1352 struct acpi_device
*device
= NULL
;
1353 struct acpi_bus_ops ops
;
1358 memset(&ops
, 0, sizeof(ops
));
1359 ops
.acpi_op_add
= 1;
1360 ops
.acpi_op_start
= 1;
1363 * Enumerate all fixed-feature devices.
1365 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
) == 0) {
1366 result
= acpi_add_single_object(&device
, acpi_root
,
1368 ACPI_BUS_TYPE_POWER_BUTTON
,
1372 if ((acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
) == 0) {
1373 result
= acpi_add_single_object(&device
, acpi_root
,
1375 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1382 static int __init
acpi_scan_init(void)
1385 struct acpi_bus_ops ops
;
1391 memset(&ops
, 0, sizeof(ops
));
1392 ops
.acpi_op_add
= 1;
1393 ops
.acpi_op_start
= 1;
1395 result
= bus_register(&acpi_bus_type
);
1397 /* We don't want to quit even if we failed to add suspend/resume */
1398 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1402 * Create the root device in the bus's device tree
1404 result
= acpi_add_single_object(&acpi_root
, NULL
, ACPI_ROOT_OBJECT
,
1405 ACPI_BUS_TYPE_SYSTEM
, &ops
);
1410 * Enumerate devices in the ACPI namespace.
1412 result
= acpi_bus_scan_fixed(acpi_root
);
1414 result
= acpi_bus_scan(acpi_root
, &ops
);
1417 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);
1423 subsys_initcall(acpi_scan_init
);