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/acpi.h>
9 #include <acpi/acpi_drivers.h>
10 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
12 #define _COMPONENT ACPI_BUS_COMPONENT
13 ACPI_MODULE_NAME("scan")
14 #define STRUCT_TO_INT(s) (*((int*)&s))
15 extern struct acpi_device
*acpi_root
;
17 #define ACPI_BUS_CLASS "system_bus"
18 #define ACPI_BUS_HID "ACPI_BUS"
19 #define ACPI_BUS_DRIVER_NAME "ACPI Bus Driver"
20 #define ACPI_BUS_DEVICE_NAME "System Bus"
22 static LIST_HEAD(acpi_device_list
);
23 DEFINE_SPINLOCK(acpi_device_lock
);
24 LIST_HEAD(acpi_wakeup_device_list
);
27 static void acpi_device_release(struct kobject
*kobj
)
29 struct acpi_device
*dev
= container_of(kobj
, struct acpi_device
, kobj
);
30 kfree(dev
->pnp
.cid_list
);
34 struct acpi_device_attribute
{
35 struct attribute attr
;
36 ssize_t(*show
) (struct acpi_device
*, char *);
37 ssize_t(*store
) (struct acpi_device
*, const char *, size_t);
40 typedef void acpi_device_sysfs_files(struct kobject
*,
41 const struct attribute
*);
43 static void setup_sys_fs_device_files(struct acpi_device
*dev
,
44 acpi_device_sysfs_files
* func
);
46 #define create_sysfs_device_files(dev) \
47 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
48 #define remove_sysfs_device_files(dev) \
49 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
51 #define to_acpi_device(n) container_of(n, struct acpi_device, kobj)
52 #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
54 static ssize_t
acpi_device_attr_show(struct kobject
*kobj
,
55 struct attribute
*attr
, char *buf
)
57 struct acpi_device
*device
= to_acpi_device(kobj
);
58 struct acpi_device_attribute
*attribute
= to_handle_attr(attr
);
59 return attribute
->show
? attribute
->show(device
, buf
) : -EIO
;
61 static ssize_t
acpi_device_attr_store(struct kobject
*kobj
,
62 struct attribute
*attr
, const char *buf
,
65 struct acpi_device
*device
= to_acpi_device(kobj
);
66 struct acpi_device_attribute
*attribute
= to_handle_attr(attr
);
67 return attribute
->store
? attribute
->store(device
, buf
, len
) : -EIO
;
70 static struct sysfs_ops acpi_device_sysfs_ops
= {
71 .show
= acpi_device_attr_show
,
72 .store
= acpi_device_attr_store
,
75 static struct kobj_type ktype_acpi_ns
= {
76 .sysfs_ops
= &acpi_device_sysfs_ops
,
77 .release
= acpi_device_release
,
80 static int namespace_uevent(struct kset
*kset
, struct kobject
*kobj
,
81 char **envp
, int num_envp
, char *buffer
,
84 struct acpi_device
*dev
= to_acpi_device(kobj
);
91 if (add_uevent_var(envp
, num_envp
, &i
, buffer
, buffer_size
, &len
,
92 "PHYSDEVDRIVER=%s", dev
->driver
->name
))
100 static struct kset_uevent_ops namespace_uevent_ops
= {
101 .uevent
= &namespace_uevent
,
104 static struct kset acpi_namespace_kset
= {
108 .subsys
= &acpi_subsys
,
109 .ktype
= &ktype_acpi_ns
,
110 .uevent_ops
= &namespace_uevent_ops
,
113 static void acpi_device_register(struct acpi_device
*device
,
114 struct acpi_device
*parent
)
119 * Link this device to its parent and siblings.
121 INIT_LIST_HEAD(&device
->children
);
122 INIT_LIST_HEAD(&device
->node
);
123 INIT_LIST_HEAD(&device
->g_list
);
124 INIT_LIST_HEAD(&device
->wakeup_list
);
126 spin_lock(&acpi_device_lock
);
127 if (device
->parent
) {
128 list_add_tail(&device
->node
, &device
->parent
->children
);
129 list_add_tail(&device
->g_list
, &device
->parent
->g_list
);
131 list_add_tail(&device
->g_list
, &acpi_device_list
);
132 if (device
->wakeup
.flags
.valid
)
133 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
134 spin_unlock(&acpi_device_lock
);
136 strlcpy(device
->kobj
.name
, device
->pnp
.bus_id
, KOBJ_NAME_LEN
);
138 device
->kobj
.parent
= &parent
->kobj
;
139 device
->kobj
.ktype
= &ktype_acpi_ns
;
140 device
->kobj
.kset
= &acpi_namespace_kset
;
141 kobject_register(&device
->kobj
);
142 create_sysfs_device_files(device
);
145 static void acpi_device_unregister(struct acpi_device
*device
, int type
)
147 spin_lock(&acpi_device_lock
);
148 if (device
->parent
) {
149 list_del(&device
->node
);
150 list_del(&device
->g_list
);
152 list_del(&device
->g_list
);
154 list_del(&device
->wakeup_list
);
156 spin_unlock(&acpi_device_lock
);
158 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
159 remove_sysfs_device_files(device
);
160 kobject_unregister(&device
->kobj
);
163 void acpi_bus_data_handler(acpi_handle handle
, u32 function
, void *context
)
165 ACPI_FUNCTION_TRACE("acpi_bus_data_handler");
172 static int acpi_bus_get_power_flags(struct acpi_device
*device
)
174 acpi_status status
= 0;
175 acpi_handle handle
= NULL
;
178 ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags");
181 * Power Management Flags
183 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
184 if (ACPI_SUCCESS(status
))
185 device
->power
.flags
.explicit_get
= 1;
186 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
187 if (ACPI_SUCCESS(status
))
188 device
->power
.flags
.inrush_current
= 1;
191 * Enumerate supported power management states
193 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3
; i
++) {
194 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
195 char object_name
[5] = { '_', 'P', 'R', '0' + i
, '\0' };
197 /* Evaluate "_PRx" to se if power resources are referenced */
198 acpi_evaluate_reference(device
->handle
, object_name
, NULL
,
200 if (ps
->resources
.count
) {
201 device
->power
.flags
.power_resources
= 1;
205 /* Evaluate "_PSx" to see if we can do explicit sets */
206 object_name
[2] = 'S';
207 status
= acpi_get_handle(device
->handle
, object_name
, &handle
);
208 if (ACPI_SUCCESS(status
)) {
209 ps
->flags
.explicit_set
= 1;
213 /* State is valid if we have some power control */
214 if (ps
->resources
.count
|| ps
->flags
.explicit_set
)
217 ps
->power
= -1; /* Unknown - driver assigned */
218 ps
->latency
= -1; /* Unknown - driver assigned */
221 /* Set defaults for D0 and D3 states (always valid) */
222 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
223 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
224 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
225 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
227 /* TBD: System wake support and resource requirements. */
229 device
->power
.state
= ACPI_STATE_UNKNOWN
;
234 int acpi_match_ids(struct acpi_device
*device
, char *ids
)
236 if (device
->flags
.hardware_id
)
237 if (strstr(ids
, device
->pnp
.hardware_id
))
240 if (device
->flags
.compatible_ids
) {
241 struct acpi_compatible_id_list
*cid_list
= device
->pnp
.cid_list
;
244 /* compare multiple _CID entries against driver ids */
245 for (i
= 0; i
< cid_list
->count
; i
++) {
246 if (strstr(ids
, cid_list
->id
[i
].value
))
254 acpi_bus_extract_wakeup_device_power_package(struct acpi_device
*device
,
255 union acpi_object
*package
)
258 union acpi_object
*element
= NULL
;
260 if (!device
|| !package
|| (package
->package
.count
< 2))
261 return AE_BAD_PARAMETER
;
263 element
= &(package
->package
.elements
[0]);
265 return AE_BAD_PARAMETER
;
266 if (element
->type
== ACPI_TYPE_PACKAGE
) {
267 if ((element
->package
.count
< 2) ||
268 (element
->package
.elements
[0].type
!=
269 ACPI_TYPE_LOCAL_REFERENCE
)
270 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
272 device
->wakeup
.gpe_device
=
273 element
->package
.elements
[0].reference
.handle
;
274 device
->wakeup
.gpe_number
=
275 (u32
) element
->package
.elements
[1].integer
.value
;
276 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
277 device
->wakeup
.gpe_number
= element
->integer
.value
;
281 element
= &(package
->package
.elements
[1]);
282 if (element
->type
!= ACPI_TYPE_INTEGER
) {
285 device
->wakeup
.sleep_state
= element
->integer
.value
;
287 if ((package
->package
.count
- 2) > ACPI_MAX_HANDLES
) {
290 device
->wakeup
.resources
.count
= package
->package
.count
- 2;
291 for (i
= 0; i
< device
->wakeup
.resources
.count
; i
++) {
292 element
= &(package
->package
.elements
[i
+ 2]);
293 if (element
->type
!= ACPI_TYPE_ANY
) {
297 device
->wakeup
.resources
.handles
[i
] = element
->reference
.handle
;
303 static int acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
305 acpi_status status
= 0;
306 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
307 union acpi_object
*package
= NULL
;
309 ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags");
312 status
= acpi_evaluate_object(device
->handle
, "_PRW", NULL
, &buffer
);
313 if (ACPI_FAILURE(status
)) {
314 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error evaluating _PRW\n"));
318 package
= (union acpi_object
*)buffer
.pointer
;
319 status
= acpi_bus_extract_wakeup_device_power_package(device
, package
);
320 if (ACPI_FAILURE(status
)) {
321 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
322 "Error extracting _PRW package\n"));
326 acpi_os_free(buffer
.pointer
);
328 device
->wakeup
.flags
.valid
= 1;
329 /* Power button, Lid switch always enable wakeup */
330 if (!acpi_match_ids(device
, "PNP0C0D,PNP0C0C,PNP0C0E"))
331 device
->wakeup
.flags
.run_wake
= 1;
334 if (ACPI_FAILURE(status
))
335 device
->flags
.wake_capable
= 0;
339 /* --------------------------------------------------------------------------
340 ACPI sysfs device file support
341 -------------------------------------------------------------------------- */
342 static ssize_t
acpi_eject_store(struct acpi_device
*device
,
343 const char *buf
, size_t count
);
345 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
346 static struct acpi_device_attribute acpi_device_attr_##_name = \
347 __ATTR(_name, _mode, _show, _store)
349 ACPI_DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
352 * setup_sys_fs_device_files - sets up the device files under device namespace
353 * @dev: acpi_device object
354 * @func: function pointer to create or destroy the device file
357 setup_sys_fs_device_files(struct acpi_device
*dev
,
358 acpi_device_sysfs_files
* func
)
361 acpi_handle temp
= NULL
;
364 * If device has _EJ0, 'eject' file is created that is used to trigger
365 * hot-removal function from userland.
367 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
368 if (ACPI_SUCCESS(status
))
369 (*(func
)) (&dev
->kobj
, &acpi_device_attr_eject
.attr
);
372 static int acpi_eject_operation(acpi_handle handle
, int lockable
)
374 struct acpi_object_list arg_list
;
375 union acpi_object arg
;
376 acpi_status status
= AE_OK
;
379 * TBD: evaluate _PS3?
384 arg_list
.pointer
= &arg
;
385 arg
.type
= ACPI_TYPE_INTEGER
;
386 arg
.integer
.value
= 0;
387 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
391 arg_list
.pointer
= &arg
;
392 arg
.type
= ACPI_TYPE_INTEGER
;
393 arg
.integer
.value
= 1;
399 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
400 if (ACPI_FAILURE(status
)) {
408 acpi_eject_store(struct acpi_device
*device
, const char *buf
, size_t count
)
415 acpi_object_type type
= 0;
417 if ((!count
) || (buf
[0] != '1')) {
421 if (device
->driver
== NULL
) {
426 status
= acpi_get_type(device
->handle
, &type
);
427 if (ACPI_FAILURE(status
) || (!device
->flags
.ejectable
)) {
432 islockable
= device
->flags
.lockable
;
433 handle
= device
->handle
;
435 result
= acpi_bus_trim(device
, 1);
438 result
= acpi_eject_operation(handle
, islockable
);
447 /* --------------------------------------------------------------------------
448 Performance Management
449 -------------------------------------------------------------------------- */
451 static int acpi_bus_get_perf_flags(struct acpi_device
*device
)
453 device
->performance
.state
= ACPI_STATE_UNKNOWN
;
457 /* --------------------------------------------------------------------------
459 -------------------------------------------------------------------------- */
461 static LIST_HEAD(acpi_bus_drivers
);
464 * acpi_bus_match - match device IDs to driver's supported IDs
465 * @device: the device that we are trying to match to a driver
466 * @driver: driver whose device id table is being checked
468 * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
469 * matches the specified driver's criteria.
472 acpi_bus_match(struct acpi_device
*device
, struct acpi_driver
*driver
)
474 if (driver
&& driver
->ops
.match
)
475 return driver
->ops
.match(device
, driver
);
476 return acpi_match_ids(device
, driver
->ids
);
480 * acpi_bus_driver_init - add a device to a driver
481 * @device: the device to add and initialize
482 * @driver: driver for the device
484 * Used to initialize a device via its device driver. Called whenever a
485 * driver is bound to a device. Invokes the driver's add() and start() ops.
488 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
492 ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
494 if (!device
|| !driver
)
495 return_VALUE(-EINVAL
);
497 if (!driver
->ops
.add
)
498 return_VALUE(-ENOSYS
);
500 result
= driver
->ops
.add(device
);
502 device
->driver
= NULL
;
503 acpi_driver_data(device
) = NULL
;
504 return_VALUE(result
);
507 device
->driver
= driver
;
510 * TBD - Configuration Management: Assign resources to device based
511 * upon possible configuration and currently allocated resources.
514 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
515 "Driver successfully bound to device\n"));
519 static int acpi_start_single_object(struct acpi_device
*device
)
522 struct acpi_driver
*driver
;
524 ACPI_FUNCTION_TRACE("acpi_start_single_object");
526 if (!(driver
= device
->driver
))
529 if (driver
->ops
.start
) {
530 result
= driver
->ops
.start(device
);
531 if (result
&& driver
->ops
.remove
)
532 driver
->ops
.remove(device
, ACPI_BUS_REMOVAL_NORMAL
);
535 return_VALUE(result
);
538 static void acpi_driver_attach(struct acpi_driver
*drv
)
540 struct list_head
*node
, *next
;
542 ACPI_FUNCTION_TRACE("acpi_driver_attach");
544 spin_lock(&acpi_device_lock
);
545 list_for_each_safe(node
, next
, &acpi_device_list
) {
546 struct acpi_device
*dev
=
547 container_of(node
, struct acpi_device
, g_list
);
549 if (dev
->driver
|| !dev
->status
.present
)
551 spin_unlock(&acpi_device_lock
);
553 if (!acpi_bus_match(dev
, drv
)) {
554 if (!acpi_bus_driver_init(dev
, drv
)) {
555 acpi_start_single_object(dev
);
556 atomic_inc(&drv
->references
);
557 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
558 "Found driver [%s] for device [%s]\n",
559 drv
->name
, dev
->pnp
.bus_id
));
562 spin_lock(&acpi_device_lock
);
564 spin_unlock(&acpi_device_lock
);
567 static void acpi_driver_detach(struct acpi_driver
*drv
)
569 struct list_head
*node
, *next
;
571 ACPI_FUNCTION_TRACE("acpi_driver_detach");
573 spin_lock(&acpi_device_lock
);
574 list_for_each_safe(node
, next
, &acpi_device_list
) {
575 struct acpi_device
*dev
=
576 container_of(node
, struct acpi_device
, g_list
);
578 if (dev
->driver
== drv
) {
579 spin_unlock(&acpi_device_lock
);
581 drv
->ops
.remove(dev
, ACPI_BUS_REMOVAL_NORMAL
);
582 spin_lock(&acpi_device_lock
);
584 dev
->driver_data
= NULL
;
585 atomic_dec(&drv
->references
);
588 spin_unlock(&acpi_device_lock
);
592 * acpi_bus_register_driver - register a driver with the ACPI bus
593 * @driver: driver being registered
595 * Registers a driver with the ACPI bus. Searches the namespace for all
596 * devices that match the driver's criteria and binds. Returns zero for
597 * success or a negative error status for failure.
599 int acpi_bus_register_driver(struct acpi_driver
*driver
)
601 ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
604 return_VALUE(-ENODEV
);
606 spin_lock(&acpi_device_lock
);
607 list_add_tail(&driver
->node
, &acpi_bus_drivers
);
608 spin_unlock(&acpi_device_lock
);
609 acpi_driver_attach(driver
);
614 EXPORT_SYMBOL(acpi_bus_register_driver
);
617 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
618 * @driver: driver to unregister
620 * Unregisters a driver with the ACPI bus. Searches the namespace for all
621 * devices that match the driver's criteria and unbinds.
623 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
625 acpi_driver_detach(driver
);
627 if (!atomic_read(&driver
->references
)) {
628 spin_lock(&acpi_device_lock
);
629 list_del_init(&driver
->node
);
630 spin_unlock(&acpi_device_lock
);
635 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
638 * acpi_bus_find_driver - check if there is a driver installed for the device
639 * @device: device that we are trying to find a supporting driver for
641 * Parses the list of registered drivers looking for a driver applicable for
642 * the specified device.
644 static int acpi_bus_find_driver(struct acpi_device
*device
)
647 struct list_head
*node
, *next
;
649 ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
651 spin_lock(&acpi_device_lock
);
652 list_for_each_safe(node
, next
, &acpi_bus_drivers
) {
653 struct acpi_driver
*driver
=
654 container_of(node
, struct acpi_driver
, node
);
656 atomic_inc(&driver
->references
);
657 spin_unlock(&acpi_device_lock
);
658 if (!acpi_bus_match(device
, driver
)) {
659 result
= acpi_bus_driver_init(device
, driver
);
663 atomic_dec(&driver
->references
);
664 spin_lock(&acpi_device_lock
);
666 spin_unlock(&acpi_device_lock
);
669 return_VALUE(result
);
672 /* --------------------------------------------------------------------------
674 -------------------------------------------------------------------------- */
676 static int acpi_bus_get_flags(struct acpi_device
*device
)
678 acpi_status status
= AE_OK
;
679 acpi_handle temp
= NULL
;
681 ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
683 /* Presence of _STA indicates 'dynamic_status' */
684 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
685 if (ACPI_SUCCESS(status
))
686 device
->flags
.dynamic_status
= 1;
688 /* Presence of _CID indicates 'compatible_ids' */
689 status
= acpi_get_handle(device
->handle
, "_CID", &temp
);
690 if (ACPI_SUCCESS(status
))
691 device
->flags
.compatible_ids
= 1;
693 /* Presence of _RMV indicates 'removable' */
694 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
695 if (ACPI_SUCCESS(status
))
696 device
->flags
.removable
= 1;
698 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
699 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
700 if (ACPI_SUCCESS(status
))
701 device
->flags
.ejectable
= 1;
703 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
704 if (ACPI_SUCCESS(status
))
705 device
->flags
.ejectable
= 1;
708 /* Presence of _LCK indicates 'lockable' */
709 status
= acpi_get_handle(device
->handle
, "_LCK", &temp
);
710 if (ACPI_SUCCESS(status
))
711 device
->flags
.lockable
= 1;
713 /* Presence of _PS0|_PR0 indicates 'power manageable' */
714 status
= acpi_get_handle(device
->handle
, "_PS0", &temp
);
715 if (ACPI_FAILURE(status
))
716 status
= acpi_get_handle(device
->handle
, "_PR0", &temp
);
717 if (ACPI_SUCCESS(status
))
718 device
->flags
.power_manageable
= 1;
720 /* Presence of _PRW indicates wake capable */
721 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
722 if (ACPI_SUCCESS(status
))
723 device
->flags
.wake_capable
= 1;
725 /* TBD: Peformance management */
730 static void acpi_device_get_busid(struct acpi_device
*device
,
731 acpi_handle handle
, int type
)
733 char bus_id
[5] = { '?', 0 };
734 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
740 * The device's Bus ID is simply the object name.
741 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
744 case ACPI_BUS_TYPE_SYSTEM
:
745 strcpy(device
->pnp
.bus_id
, "ACPI");
747 case ACPI_BUS_TYPE_POWER_BUTTON
:
748 strcpy(device
->pnp
.bus_id
, "PWRF");
750 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
751 strcpy(device
->pnp
.bus_id
, "SLPF");
754 acpi_get_name(handle
, ACPI_SINGLE_NAME
, &buffer
);
755 /* Clean up trailing underscores (if any) */
756 for (i
= 3; i
> 1; i
--) {
757 if (bus_id
[i
] == '_')
762 strcpy(device
->pnp
.bus_id
, bus_id
);
767 static void acpi_device_set_id(struct acpi_device
*device
,
768 struct acpi_device
*parent
, acpi_handle handle
,
771 struct acpi_device_info
*info
;
772 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
775 struct acpi_compatible_id_list
*cid_list
= NULL
;
779 case ACPI_BUS_TYPE_DEVICE
:
780 status
= acpi_get_object_info(handle
, &buffer
);
781 if (ACPI_FAILURE(status
)) {
782 printk("%s: Error reading device info\n", __FUNCTION__
);
786 info
= buffer
.pointer
;
787 if (info
->valid
& ACPI_VALID_HID
)
788 hid
= info
->hardware_id
.value
;
789 if (info
->valid
& ACPI_VALID_UID
)
790 uid
= info
->unique_id
.value
;
791 if (info
->valid
& ACPI_VALID_CID
)
792 cid_list
= &info
->compatibility_id
;
793 if (info
->valid
& ACPI_VALID_ADR
) {
794 device
->pnp
.bus_address
= info
->address
;
795 device
->flags
.bus_address
= 1;
798 case ACPI_BUS_TYPE_POWER
:
799 hid
= ACPI_POWER_HID
;
801 case ACPI_BUS_TYPE_PROCESSOR
:
802 hid
= ACPI_PROCESSOR_HID
;
804 case ACPI_BUS_TYPE_SYSTEM
:
805 hid
= ACPI_SYSTEM_HID
;
807 case ACPI_BUS_TYPE_THERMAL
:
808 hid
= ACPI_THERMAL_HID
;
810 case ACPI_BUS_TYPE_POWER_BUTTON
:
811 hid
= ACPI_BUTTON_HID_POWERF
;
813 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
814 hid
= ACPI_BUTTON_HID_SLEEPF
;
821 * Fix for the system root bus device -- the only root-level device.
823 if (((acpi_handle
)parent
== ACPI_ROOT_OBJECT
) && (type
== ACPI_BUS_TYPE_DEVICE
)) {
825 strcpy(device
->pnp
.device_name
, ACPI_BUS_DEVICE_NAME
);
826 strcpy(device
->pnp
.device_class
, ACPI_BUS_CLASS
);
830 strcpy(device
->pnp
.hardware_id
, hid
);
831 device
->flags
.hardware_id
= 1;
834 strcpy(device
->pnp
.unique_id
, uid
);
835 device
->flags
.unique_id
= 1;
838 device
->pnp
.cid_list
= kmalloc(cid_list
->size
, GFP_KERNEL
);
839 if (device
->pnp
.cid_list
)
840 memcpy(device
->pnp
.cid_list
, cid_list
, cid_list
->size
);
842 printk(KERN_ERR
"Memory allocation error\n");
845 acpi_os_free(buffer
.pointer
);
848 static int acpi_device_set_context(struct acpi_device
*device
, int type
)
850 acpi_status status
= AE_OK
;
855 * Attach this 'struct acpi_device' to the ACPI object. This makes
856 * resolutions from handle->device very efficient. Note that we need
857 * to be careful with fixed-feature devices as they all attach to the
860 if (type
!= ACPI_BUS_TYPE_POWER_BUTTON
&&
861 type
!= ACPI_BUS_TYPE_SLEEP_BUTTON
) {
862 status
= acpi_attach_data(device
->handle
,
863 acpi_bus_data_handler
, device
);
865 if (ACPI_FAILURE(status
)) {
866 printk("Error attaching device data\n");
873 static void acpi_device_get_debug_info(struct acpi_device
*device
,
874 acpi_handle handle
, int type
)
876 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
877 char *type_string
= NULL
;
878 char name
[80] = { '?', '\0' };
879 struct acpi_buffer buffer
= { sizeof(name
), name
};
882 case ACPI_BUS_TYPE_DEVICE
:
883 type_string
= "Device";
884 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
886 case ACPI_BUS_TYPE_POWER
:
887 type_string
= "Power Resource";
888 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
890 case ACPI_BUS_TYPE_PROCESSOR
:
891 type_string
= "Processor";
892 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
894 case ACPI_BUS_TYPE_SYSTEM
:
895 type_string
= "System";
896 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
898 case ACPI_BUS_TYPE_THERMAL
:
899 type_string
= "Thermal Zone";
900 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
902 case ACPI_BUS_TYPE_POWER_BUTTON
:
903 type_string
= "Power Button";
904 sprintf(name
, "PWRB");
906 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
907 type_string
= "Sleep Button";
908 sprintf(name
, "SLPB");
912 printk(KERN_DEBUG
"Found %s %s [%p]\n", type_string
, name
, handle
);
913 #endif /*CONFIG_ACPI_DEBUG_OUTPUT */
916 static int acpi_bus_remove(struct acpi_device
*dev
, int rmdevice
)
919 struct acpi_driver
*driver
;
921 ACPI_FUNCTION_TRACE("acpi_bus_remove");
924 return_VALUE(-EINVAL
);
926 driver
= dev
->driver
;
928 if ((driver
) && (driver
->ops
.remove
)) {
930 if (driver
->ops
.stop
) {
931 result
= driver
->ops
.stop(dev
, ACPI_BUS_REMOVAL_EJECT
);
933 return_VALUE(result
);
936 result
= dev
->driver
->ops
.remove(dev
, ACPI_BUS_REMOVAL_EJECT
);
938 return_VALUE(result
);
941 atomic_dec(&dev
->driver
->references
);
943 acpi_driver_data(dev
) = NULL
;
949 if (dev
->flags
.bus_address
) {
950 if ((dev
->parent
) && (dev
->parent
->ops
.unbind
))
951 dev
->parent
->ops
.unbind(dev
);
954 acpi_device_unregister(dev
, ACPI_BUS_REMOVAL_EJECT
);
960 acpi_add_single_object(struct acpi_device
**child
,
961 struct acpi_device
*parent
, acpi_handle handle
, int type
)
964 struct acpi_device
*device
= NULL
;
966 ACPI_FUNCTION_TRACE("acpi_add_single_object");
969 return_VALUE(-EINVAL
);
971 device
= kmalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
973 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Memory allocation error\n"));
974 return_VALUE(-ENOMEM
);
976 memset(device
, 0, sizeof(struct acpi_device
));
978 device
->handle
= handle
;
979 device
->parent
= parent
;
981 acpi_device_get_busid(device
, handle
, type
);
986 * Get prior to calling acpi_bus_get_status() so we know whether
987 * or not _STA is present. Note that we only look for object
988 * handles -- cannot evaluate objects until we know the device is
989 * present and properly initialized.
991 result
= acpi_bus_get_flags(device
);
998 * See if the device is present. We always assume that non-Device
999 * and non-Processor objects (e.g. thermal zones, power resources,
1000 * etc.) are present, functioning, etc. (at least when parent object
1001 * is present). Note that _STA has a different meaning for some
1002 * objects (e.g. power resources) so we need to be careful how we use
1006 case ACPI_BUS_TYPE_PROCESSOR
:
1007 case ACPI_BUS_TYPE_DEVICE
:
1008 result
= acpi_bus_get_status(device
);
1009 if (ACPI_FAILURE(result
) || !device
->status
.present
) {
1015 STRUCT_TO_INT(device
->status
) = 0x0F;
1022 * TBD: Synch with Core's enumeration/initialization process.
1026 * Hardware ID, Unique ID, & Bus Address
1027 * -------------------------------------
1029 acpi_device_set_id(device
, parent
, handle
, type
);
1035 if (device
->flags
.power_manageable
) {
1036 result
= acpi_bus_get_power_flags(device
);
1042 * Wakeup device management
1043 *-----------------------
1045 if (device
->flags
.wake_capable
) {
1046 result
= acpi_bus_get_wakeup_device_flags(device
);
1052 * Performance Management
1053 * ----------------------
1055 if (device
->flags
.performance_manageable
) {
1056 result
= acpi_bus_get_perf_flags(device
);
1061 if ((result
= acpi_device_set_context(device
, type
)))
1064 acpi_device_get_debug_info(device
, handle
, type
);
1066 acpi_device_register(device
, parent
);
1069 * Bind _ADR-Based Devices
1070 * -----------------------
1071 * If there's a a bus address (_ADR) then we utilize the parent's
1072 * 'bind' function (if exists) to bind the ACPI- and natively-
1073 * enumerated device representations.
1075 if (device
->flags
.bus_address
) {
1076 if (device
->parent
&& device
->parent
->ops
.bind
)
1077 device
->parent
->ops
.bind(device
);
1081 * Locate & Attach Driver
1082 * ----------------------
1083 * If there's a hardware id (_HID) or compatible ids (_CID) we check
1084 * to see if there's a driver installed for this kind of device. Note
1085 * that drivers can install before or after a device is enumerated.
1087 * TBD: Assumes LDM provides driver hot-plug capability.
1089 acpi_bus_find_driver(device
);
1095 kfree(device
->pnp
.cid_list
);
1099 return_VALUE(result
);
1102 static int acpi_bus_scan(struct acpi_device
*start
, struct acpi_bus_ops
*ops
)
1104 acpi_status status
= AE_OK
;
1105 struct acpi_device
*parent
= NULL
;
1106 struct acpi_device
*child
= NULL
;
1107 acpi_handle phandle
= NULL
;
1108 acpi_handle chandle
= NULL
;
1109 acpi_object_type type
= 0;
1112 ACPI_FUNCTION_TRACE("acpi_bus_scan");
1115 return_VALUE(-EINVAL
);
1118 phandle
= start
->handle
;
1121 * Parse through the ACPI namespace, identify all 'devices', and
1122 * create a new 'struct acpi_device' for each.
1124 while ((level
> 0) && parent
) {
1126 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1130 * If this scope is exhausted then move our way back up.
1132 if (ACPI_FAILURE(status
)) {
1135 acpi_get_parent(phandle
, &phandle
);
1137 parent
= parent
->parent
;
1141 status
= acpi_get_type(chandle
, &type
);
1142 if (ACPI_FAILURE(status
))
1146 * If this is a scope object then parse it (depth-first).
1148 if (type
== ACPI_TYPE_LOCAL_SCOPE
) {
1156 * We're only interested in objects that we consider 'devices'.
1159 case ACPI_TYPE_DEVICE
:
1160 type
= ACPI_BUS_TYPE_DEVICE
;
1162 case ACPI_TYPE_PROCESSOR
:
1163 type
= ACPI_BUS_TYPE_PROCESSOR
;
1165 case ACPI_TYPE_THERMAL
:
1166 type
= ACPI_BUS_TYPE_THERMAL
;
1168 case ACPI_TYPE_POWER
:
1169 type
= ACPI_BUS_TYPE_POWER
;
1175 if (ops
->acpi_op_add
)
1176 status
= acpi_add_single_object(&child
, parent
,
1179 status
= acpi_bus_get_device(chandle
, &child
);
1181 if (ACPI_FAILURE(status
))
1184 if (ops
->acpi_op_start
) {
1185 status
= acpi_start_single_object(child
);
1186 if (ACPI_FAILURE(status
))
1191 * If the device is present, enabled, and functioning then
1192 * parse its scope (depth-first). Note that we need to
1193 * represent absent devices to facilitate PnP notifications
1194 * -- but only the subtree head (not all of its children,
1195 * which will be enumerated when the parent is inserted).
1197 * TBD: Need notifications and other detection mechanisms
1198 * in place before we can fully implement this.
1200 if (child
->status
.present
) {
1201 status
= acpi_get_next_object(ACPI_TYPE_ANY
, chandle
,
1203 if (ACPI_SUCCESS(status
)) {
1216 acpi_bus_add(struct acpi_device
**child
,
1217 struct acpi_device
*parent
, acpi_handle handle
, int type
)
1220 struct acpi_bus_ops ops
;
1222 ACPI_FUNCTION_TRACE("acpi_bus_add");
1224 result
= acpi_add_single_object(child
, parent
, handle
, type
);
1226 memset(&ops
, 0, sizeof(ops
));
1227 ops
.acpi_op_add
= 1;
1228 result
= acpi_bus_scan(*child
, &ops
);
1230 return_VALUE(result
);
1233 EXPORT_SYMBOL(acpi_bus_add
);
1235 int acpi_bus_start(struct acpi_device
*device
)
1238 struct acpi_bus_ops ops
;
1240 ACPI_FUNCTION_TRACE("acpi_bus_start");
1243 return_VALUE(-EINVAL
);
1245 result
= acpi_start_single_object(device
);
1247 memset(&ops
, 0, sizeof(ops
));
1248 ops
.acpi_op_start
= 1;
1249 result
= acpi_bus_scan(device
, &ops
);
1251 return_VALUE(result
);
1254 EXPORT_SYMBOL(acpi_bus_start
);
1256 int acpi_bus_trim(struct acpi_device
*start
, int rmdevice
)
1259 struct acpi_device
*parent
, *child
;
1260 acpi_handle phandle
, chandle
;
1261 acpi_object_type type
;
1266 phandle
= start
->handle
;
1267 child
= chandle
= NULL
;
1269 while ((level
> 0) && parent
&& (!err
)) {
1270 status
= acpi_get_next_object(ACPI_TYPE_ANY
, phandle
,
1274 * If this scope is exhausted then move our way back up.
1276 if (ACPI_FAILURE(status
)) {
1279 acpi_get_parent(phandle
, &phandle
);
1281 parent
= parent
->parent
;
1284 err
= acpi_bus_remove(child
, rmdevice
);
1286 err
= acpi_bus_remove(child
, 1);
1291 status
= acpi_get_type(chandle
, &type
);
1292 if (ACPI_FAILURE(status
)) {
1296 * If there is a device corresponding to chandle then
1297 * parse it (depth-first).
1299 if (acpi_bus_get_device(chandle
, &child
) == 0) {
1309 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1312 static int acpi_bus_scan_fixed(struct acpi_device
*root
)
1315 struct acpi_device
*device
= NULL
;
1317 ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
1320 return_VALUE(-ENODEV
);
1323 * Enumerate all fixed-feature devices.
1325 if (acpi_fadt
.pwr_button
== 0) {
1326 result
= acpi_add_single_object(&device
, acpi_root
,
1328 ACPI_BUS_TYPE_POWER_BUTTON
);
1330 result
= acpi_start_single_object(device
);
1333 if (acpi_fadt
.sleep_button
== 0) {
1334 result
= acpi_add_single_object(&device
, acpi_root
,
1336 ACPI_BUS_TYPE_SLEEP_BUTTON
);
1338 result
= acpi_start_single_object(device
);
1341 return_VALUE(result
);
1345 static inline struct acpi_device
* to_acpi_dev(struct device
* dev
)
1347 return container_of(dev
, struct acpi_device
, dev
);
1351 static int root_suspend(struct acpi_device
* acpi_dev
, pm_message_t state
)
1353 struct acpi_device
* dev
, * next
;
1356 spin_lock(&acpi_device_lock
);
1357 list_for_each_entry_safe_reverse(dev
, next
, &acpi_device_list
, g_list
) {
1358 if (dev
->driver
&& dev
->driver
->ops
.suspend
) {
1359 spin_unlock(&acpi_device_lock
);
1360 result
= dev
->driver
->ops
.suspend(dev
, 0);
1362 printk(KERN_ERR PREFIX
"[%s - %s] Suspend failed: %d\n",
1363 acpi_device_name(dev
),
1364 acpi_device_bid(dev
), result
);
1366 spin_lock(&acpi_device_lock
);
1369 spin_unlock(&acpi_device_lock
);
1374 static int acpi_device_suspend(struct device
* dev
, pm_message_t state
)
1376 struct acpi_device
* acpi_dev
= to_acpi_dev(dev
);
1379 * For now, we should only register 1 generic device -
1380 * the ACPI root device - and from there, we walk the
1381 * tree of ACPI devices to suspend each one using the
1382 * ACPI driver methods.
1384 if (acpi_dev
->handle
== ACPI_ROOT_OBJECT
)
1385 root_suspend(acpi_dev
, state
);
1391 static int root_resume(struct acpi_device
* acpi_dev
)
1393 struct acpi_device
* dev
, * next
;
1396 spin_lock(&acpi_device_lock
);
1397 list_for_each_entry_safe(dev
, next
, &acpi_device_list
, g_list
) {
1398 if (dev
->driver
&& dev
->driver
->ops
.resume
) {
1399 spin_unlock(&acpi_device_lock
);
1400 result
= dev
->driver
->ops
.resume(dev
, 0);
1402 printk(KERN_ERR PREFIX
"[%s - %s] resume failed: %d\n",
1403 acpi_device_name(dev
),
1404 acpi_device_bid(dev
), result
);
1406 spin_lock(&acpi_device_lock
);
1409 spin_unlock(&acpi_device_lock
);
1414 static int acpi_device_resume(struct device
* dev
)
1416 struct acpi_device
* acpi_dev
= to_acpi_dev(dev
);
1419 * For now, we should only register 1 generic device -
1420 * the ACPI root device - and from there, we walk the
1421 * tree of ACPI devices to resume each one using the
1422 * ACPI driver methods.
1424 if (acpi_dev
->handle
== ACPI_ROOT_OBJECT
)
1425 root_resume(acpi_dev
);
1430 struct bus_type acpi_bus_type
= {
1432 .suspend
= acpi_device_suspend
,
1433 .resume
= acpi_device_resume
,
1438 static int __init
acpi_scan_init(void)
1441 struct acpi_bus_ops ops
;
1443 ACPI_FUNCTION_TRACE("acpi_scan_init");
1448 kset_register(&acpi_namespace_kset
);
1450 result
= bus_register(&acpi_bus_type
);
1452 /* We don't want to quit even if we failed to add suspend/resume */
1453 printk(KERN_ERR PREFIX
"Could not register bus type\n");
1457 * Create the root device in the bus's device tree
1459 result
= acpi_add_single_object(&acpi_root
, NULL
, ACPI_ROOT_OBJECT
,
1460 ACPI_BUS_TYPE_SYSTEM
);
1464 result
= acpi_start_single_object(acpi_root
);
1468 acpi_root
->dev
.bus
= &acpi_bus_type
;
1469 snprintf(acpi_root
->dev
.bus_id
, BUS_ID_SIZE
, "%s", acpi_bus_type
.name
);
1470 result
= device_register(&acpi_root
->dev
);
1472 /* We don't want to quit even if we failed to add suspend/resume */
1473 printk(KERN_ERR PREFIX
"Could not register device\n");
1477 * Enumerate devices in the ACPI namespace.
1479 result
= acpi_bus_scan_fixed(acpi_root
);
1481 memset(&ops
, 0, sizeof(ops
));
1482 ops
.acpi_op_add
= 1;
1483 ops
.acpi_op_start
= 1;
1484 result
= acpi_bus_scan(acpi_root
, &ops
);
1488 acpi_device_unregister(acpi_root
, ACPI_BUS_REMOVAL_NORMAL
);
1491 return_VALUE(result
);
1494 subsys_initcall(acpi_scan_init
);