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/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
15 #include <acpi/acpi_drivers.h>
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 #define STRUCT_TO_INT(s) (*((int*)&s))
22 extern struct acpi_device
*acpi_root
;
24 #define ACPI_BUS_CLASS "system_bus"
25 #define ACPI_BUS_HID "LNXSYBUS"
26 #define ACPI_BUS_DEVICE_NAME "System Bus"
28 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
31 * If set, devices will be hot-removed even if they cannot be put offline
32 * gracefully (from the kernel's standpoint).
34 bool acpi_force_hot_remove
;
36 static const char *dummy_hid
= "device";
38 static LIST_HEAD(acpi_bus_id_list
);
39 static DEFINE_MUTEX(acpi_scan_lock
);
40 static LIST_HEAD(acpi_scan_handlers_list
);
41 DEFINE_MUTEX(acpi_device_lock
);
42 LIST_HEAD(acpi_wakeup_device_list
);
44 struct acpi_device_bus_id
{
46 unsigned int instance_no
;
47 struct list_head node
;
50 void acpi_scan_lock_acquire(void)
52 mutex_lock(&acpi_scan_lock
);
54 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire
);
56 void acpi_scan_lock_release(void)
58 mutex_unlock(&acpi_scan_lock
);
60 EXPORT_SYMBOL_GPL(acpi_scan_lock_release
);
62 int acpi_scan_add_handler(struct acpi_scan_handler
*handler
)
64 if (!handler
|| !handler
->attach
)
67 list_add_tail(&handler
->list_node
, &acpi_scan_handlers_list
);
71 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler
*handler
,
72 const char *hotplug_profile_name
)
76 error
= acpi_scan_add_handler(handler
);
80 acpi_sysfs_add_hotplug_profile(&handler
->hotplug
, hotplug_profile_name
);
85 * Creates hid/cid(s) string needed for modalias and uevent
86 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
87 * char *modalias: "acpi:IBM0001:ACPI0001"
89 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
94 struct acpi_hardware_id
*id
;
96 if (list_empty(&acpi_dev
->pnp
.ids
))
99 len
= snprintf(modalias
, size
, "acpi:");
102 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
103 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
104 if (count
< 0 || count
>= size
)
110 modalias
[len
] = '\0';
115 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
116 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
119 /* Device has no HID and no CID or string is >1024 */
120 len
= create_modalias(acpi_dev
, buf
, 1024);
126 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
128 static acpi_status
acpi_bus_offline_companions(acpi_handle handle
, u32 lvl
,
129 void *data
, void **ret_p
)
131 struct acpi_device
*device
= NULL
;
132 struct acpi_device_physical_node
*pn
;
133 bool second_pass
= (bool)data
;
134 acpi_status status
= AE_OK
;
136 if (acpi_bus_get_device(handle
, &device
))
139 mutex_lock(&device
->physical_node_lock
);
141 list_for_each_entry(pn
, &device
->physical_node_list
, node
) {
145 /* Skip devices offlined by the first pass. */
149 pn
->put_online
= false;
151 ret
= device_offline(pn
->dev
);
152 if (acpi_force_hot_remove
)
156 pn
->put_online
= !ret
;
166 mutex_unlock(&device
->physical_node_lock
);
171 static acpi_status
acpi_bus_online_companions(acpi_handle handle
, u32 lvl
,
172 void *data
, void **ret_p
)
174 struct acpi_device
*device
= NULL
;
175 struct acpi_device_physical_node
*pn
;
177 if (acpi_bus_get_device(handle
, &device
))
180 mutex_lock(&device
->physical_node_lock
);
182 list_for_each_entry(pn
, &device
->physical_node_list
, node
)
183 if (pn
->put_online
) {
184 device_online(pn
->dev
);
185 pn
->put_online
= false;
188 mutex_unlock(&device
->physical_node_lock
);
193 static int acpi_scan_hot_remove(struct acpi_device
*device
)
195 acpi_handle handle
= device
->handle
;
196 struct device
*errdev
;
198 unsigned long long sta
;
200 /* If there is no handle, the device node has been unregistered. */
202 dev_dbg(&device
->dev
, "ACPI handle missing\n");
203 put_device(&device
->dev
);
208 * Carry out two passes here and ignore errors in the first pass,
209 * because if the devices in question are memory blocks and
210 * CONFIG_MEMCG is set, one of the blocks may hold data structures
211 * that the other blocks depend on, but it is not known in advance which
214 * If the first pass is successful, the second one isn't needed, though.
217 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
218 NULL
, acpi_bus_offline_companions
,
219 (void *)false, (void **)&errdev
);
220 acpi_bus_offline_companions(handle
, 0, (void *)false, (void **)&errdev
);
223 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
224 NULL
, acpi_bus_offline_companions
,
225 (void *)true , (void **)&errdev
);
226 if (!errdev
|| acpi_force_hot_remove
)
227 acpi_bus_offline_companions(handle
, 0, (void *)true,
230 if (errdev
&& !acpi_force_hot_remove
) {
231 dev_warn(errdev
, "Offline failed.\n");
232 acpi_bus_online_companions(handle
, 0, NULL
, NULL
);
233 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
,
235 acpi_bus_online_companions
, NULL
,
237 put_device(&device
->dev
);
242 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
243 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
245 acpi_bus_trim(device
);
247 /* Device node has been unregistered. */
248 put_device(&device
->dev
);
251 acpi_evaluate_lck(handle
, 0);
255 status
= acpi_evaluate_ej0(handle
);
256 if (status
== AE_NOT_FOUND
)
258 else if (ACPI_FAILURE(status
))
262 * Verify if eject was indeed successful. If not, log an error
263 * message. No need to call _OST since _EJ0 call was made OK.
265 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
266 if (ACPI_FAILURE(status
)) {
267 acpi_handle_warn(handle
,
268 "Status check after eject failed (0x%x)\n", status
);
269 } else if (sta
& ACPI_STA_DEVICE_ENABLED
) {
270 acpi_handle_warn(handle
,
271 "Eject incomplete - status 0x%llx\n", sta
);
277 static void acpi_bus_device_eject(void *context
)
279 acpi_handle handle
= context
;
280 struct acpi_device
*device
= NULL
;
281 struct acpi_scan_handler
*handler
;
282 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
285 lock_device_hotplug();
286 mutex_lock(&acpi_scan_lock
);
288 acpi_bus_get_device(handle
, &device
);
292 handler
= device
->handler
;
293 if (!handler
|| !handler
->hotplug
.enabled
) {
294 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
297 acpi_evaluate_hotplug_ost(handle
, ACPI_NOTIFY_EJECT_REQUEST
,
298 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
299 if (handler
->hotplug
.mode
== AHM_CONTAINER
)
300 kobject_uevent(&device
->dev
.kobj
, KOBJ_OFFLINE
);
302 get_device(&device
->dev
);
303 error
= acpi_scan_hot_remove(device
);
308 mutex_unlock(&acpi_scan_lock
);
309 unlock_device_hotplug();
313 acpi_evaluate_hotplug_ost(handle
, ACPI_NOTIFY_EJECT_REQUEST
, ost_code
,
318 static void acpi_scan_bus_device_check(acpi_handle handle
, u32 ost_source
)
320 struct acpi_device
*device
= NULL
;
321 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
324 lock_device_hotplug();
325 mutex_lock(&acpi_scan_lock
);
327 if (ost_source
!= ACPI_NOTIFY_BUS_CHECK
) {
328 acpi_bus_get_device(handle
, &device
);
330 dev_warn(&device
->dev
, "Attempt to re-insert\n");
334 acpi_evaluate_hotplug_ost(handle
, ost_source
,
335 ACPI_OST_SC_INSERT_IN_PROGRESS
, NULL
);
336 error
= acpi_bus_scan(handle
);
338 acpi_handle_warn(handle
, "Namespace scan failure\n");
341 error
= acpi_bus_get_device(handle
, &device
);
343 acpi_handle_warn(handle
, "Missing device node object\n");
346 ost_code
= ACPI_OST_SC_SUCCESS
;
347 if (device
->handler
&& device
->handler
->hotplug
.mode
== AHM_CONTAINER
)
348 kobject_uevent(&device
->dev
.kobj
, KOBJ_ONLINE
);
351 acpi_evaluate_hotplug_ost(handle
, ost_source
, ost_code
, NULL
);
352 mutex_unlock(&acpi_scan_lock
);
353 unlock_device_hotplug();
356 static void acpi_scan_bus_check(void *context
)
358 acpi_scan_bus_device_check((acpi_handle
)context
,
359 ACPI_NOTIFY_BUS_CHECK
);
362 static void acpi_scan_device_check(void *context
)
364 acpi_scan_bus_device_check((acpi_handle
)context
,
365 ACPI_NOTIFY_DEVICE_CHECK
);
368 static void acpi_hotplug_unsupported(acpi_handle handle
, u32 type
)
373 case ACPI_NOTIFY_BUS_CHECK
:
374 acpi_handle_debug(handle
,
375 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
376 ost_status
= ACPI_OST_SC_INSERT_NOT_SUPPORTED
;
378 case ACPI_NOTIFY_DEVICE_CHECK
:
379 acpi_handle_debug(handle
,
380 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
381 ost_status
= ACPI_OST_SC_INSERT_NOT_SUPPORTED
;
383 case ACPI_NOTIFY_EJECT_REQUEST
:
384 acpi_handle_debug(handle
,
385 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
386 ost_status
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
389 /* non-hotplug event; possibly handled by other handler */
393 acpi_evaluate_hotplug_ost(handle
, type
, ost_status
, NULL
);
396 static void acpi_hotplug_notify_cb(acpi_handle handle
, u32 type
, void *data
)
398 acpi_osd_exec_callback callback
;
399 struct acpi_scan_handler
*handler
= data
;
402 if (!handler
->hotplug
.enabled
)
403 return acpi_hotplug_unsupported(handle
, type
);
406 case ACPI_NOTIFY_BUS_CHECK
:
407 acpi_handle_debug(handle
, "ACPI_NOTIFY_BUS_CHECK event\n");
408 callback
= acpi_scan_bus_check
;
410 case ACPI_NOTIFY_DEVICE_CHECK
:
411 acpi_handle_debug(handle
, "ACPI_NOTIFY_DEVICE_CHECK event\n");
412 callback
= acpi_scan_device_check
;
414 case ACPI_NOTIFY_EJECT_REQUEST
:
415 acpi_handle_debug(handle
, "ACPI_NOTIFY_EJECT_REQUEST event\n");
416 callback
= acpi_bus_device_eject
;
419 /* non-hotplug event; possibly handled by other handler */
422 status
= acpi_os_hotplug_execute(callback
, handle
);
423 if (ACPI_FAILURE(status
))
424 acpi_evaluate_hotplug_ost(handle
, type
,
425 ACPI_OST_SC_NON_SPECIFIC_FAILURE
,
430 * acpi_bus_hot_remove_device: hot-remove a device and its children
431 * @context: struct acpi_eject_event pointer (freed in this func)
433 * Hot-remove a device and its children. This function frees up the
434 * memory space passed by arg context, so that the caller may call
435 * this function asynchronously through acpi_os_hotplug_execute().
437 void acpi_bus_hot_remove_device(void *context
)
439 struct acpi_eject_event
*ej_event
= context
;
440 struct acpi_device
*device
= ej_event
->device
;
441 acpi_handle handle
= device
->handle
;
444 lock_device_hotplug();
445 mutex_lock(&acpi_scan_lock
);
447 error
= acpi_scan_hot_remove(device
);
449 acpi_evaluate_hotplug_ost(handle
, ej_event
->event
,
450 ACPI_OST_SC_NON_SPECIFIC_FAILURE
,
453 mutex_unlock(&acpi_scan_lock
);
454 unlock_device_hotplug();
457 EXPORT_SYMBOL(acpi_bus_hot_remove_device
);
459 static ssize_t
real_power_state_show(struct device
*dev
,
460 struct device_attribute
*attr
, char *buf
)
462 struct acpi_device
*adev
= to_acpi_device(dev
);
466 ret
= acpi_device_get_power(adev
, &state
);
470 return sprintf(buf
, "%s\n", acpi_power_state_string(state
));
473 static DEVICE_ATTR(real_power_state
, 0444, real_power_state_show
, NULL
);
475 static ssize_t
power_state_show(struct device
*dev
,
476 struct device_attribute
*attr
, char *buf
)
478 struct acpi_device
*adev
= to_acpi_device(dev
);
480 return sprintf(buf
, "%s\n", acpi_power_state_string(adev
->power
.state
));
483 static DEVICE_ATTR(power_state
, 0444, power_state_show
, NULL
);
486 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
487 const char *buf
, size_t count
)
489 struct acpi_device
*acpi_device
= to_acpi_device(d
);
490 struct acpi_eject_event
*ej_event
;
491 acpi_object_type not_used
;
495 if (!count
|| buf
[0] != '1')
498 if ((!acpi_device
->handler
|| !acpi_device
->handler
->hotplug
.enabled
)
499 && !acpi_device
->driver
)
502 status
= acpi_get_type(acpi_device
->handle
, ¬_used
);
503 if (ACPI_FAILURE(status
) || !acpi_device
->flags
.ejectable
)
506 ej_event
= kmalloc(sizeof(*ej_event
), GFP_KERNEL
);
511 acpi_evaluate_hotplug_ost(acpi_device
->handle
, ACPI_OST_EC_OSPM_EJECT
,
512 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
513 ej_event
->device
= acpi_device
;
514 ej_event
->event
= ACPI_OST_EC_OSPM_EJECT
;
515 get_device(&acpi_device
->dev
);
516 status
= acpi_os_hotplug_execute(acpi_bus_hot_remove_device
, ej_event
);
517 if (ACPI_SUCCESS(status
))
520 put_device(&acpi_device
->dev
);
522 ret
= status
== AE_NO_MEMORY
? -ENOMEM
: -EAGAIN
;
525 acpi_evaluate_hotplug_ost(acpi_device
->handle
, ACPI_OST_EC_OSPM_EJECT
,
526 ACPI_OST_SC_NON_SPECIFIC_FAILURE
, NULL
);
530 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
533 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
534 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
536 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
538 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
540 static ssize_t
acpi_device_uid_show(struct device
*dev
,
541 struct device_attribute
*attr
, char *buf
)
543 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
545 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
547 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
549 static ssize_t
acpi_device_adr_show(struct device
*dev
,
550 struct device_attribute
*attr
, char *buf
)
552 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
554 return sprintf(buf
, "0x%08x\n",
555 (unsigned int)(acpi_dev
->pnp
.bus_address
));
557 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
560 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
561 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
562 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
565 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
569 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
574 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
576 /* sysfs file that shows description text from the ACPI _STR method */
577 static ssize_t
description_show(struct device
*dev
,
578 struct device_attribute
*attr
,
580 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
583 if (acpi_dev
->pnp
.str_obj
== NULL
)
587 * The _STR object contains a Unicode identifier for a device.
588 * We need to convert to utf-8 so it can be displayed.
590 result
= utf16s_to_utf8s(
591 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
592 acpi_dev
->pnp
.str_obj
->buffer
.length
,
593 UTF16_LITTLE_ENDIAN
, buf
,
596 buf
[result
++] = '\n';
600 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
603 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
605 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
607 return sprintf(buf
, "%lu\n", acpi_dev
->pnp
.sun
);
609 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
611 static int acpi_device_setup_files(struct acpi_device
*dev
)
613 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
615 unsigned long long sun
;
619 * Devices gotten from FADT don't have a "path" attribute
622 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
627 if (!list_empty(&dev
->pnp
.ids
)) {
628 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
632 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
638 * If device has _STR, 'description' file is created
640 if (acpi_has_method(dev
->handle
, "_STR")) {
641 status
= acpi_evaluate_object(dev
->handle
, "_STR",
643 if (ACPI_FAILURE(status
))
644 buffer
.pointer
= NULL
;
645 dev
->pnp
.str_obj
= buffer
.pointer
;
646 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
651 if (dev
->pnp
.type
.bus_address
)
652 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
653 if (dev
->pnp
.unique_id
)
654 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
656 status
= acpi_evaluate_integer(dev
->handle
, "_SUN", NULL
, &sun
);
657 if (ACPI_SUCCESS(status
)) {
658 dev
->pnp
.sun
= (unsigned long)sun
;
659 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
663 dev
->pnp
.sun
= (unsigned long)-1;
667 * If device has _EJ0, 'eject' file is created that is used to trigger
668 * hot-removal function from userland.
670 if (acpi_has_method(dev
->handle
, "_EJ0")) {
671 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
676 if (dev
->flags
.power_manageable
) {
677 result
= device_create_file(&dev
->dev
, &dev_attr_power_state
);
681 if (dev
->power
.flags
.power_resources
)
682 result
= device_create_file(&dev
->dev
,
683 &dev_attr_real_power_state
);
690 static void acpi_device_remove_files(struct acpi_device
*dev
)
692 if (dev
->flags
.power_manageable
) {
693 device_remove_file(&dev
->dev
, &dev_attr_power_state
);
694 if (dev
->power
.flags
.power_resources
)
695 device_remove_file(&dev
->dev
,
696 &dev_attr_real_power_state
);
700 * If device has _STR, remove 'description' file
702 if (acpi_has_method(dev
->handle
, "_STR")) {
703 kfree(dev
->pnp
.str_obj
);
704 device_remove_file(&dev
->dev
, &dev_attr_description
);
707 * If device has _EJ0, remove 'eject' file.
709 if (acpi_has_method(dev
->handle
, "_EJ0"))
710 device_remove_file(&dev
->dev
, &dev_attr_eject
);
712 if (acpi_has_method(dev
->handle
, "_SUN"))
713 device_remove_file(&dev
->dev
, &dev_attr_sun
);
715 if (dev
->pnp
.unique_id
)
716 device_remove_file(&dev
->dev
, &dev_attr_uid
);
717 if (dev
->pnp
.type
.bus_address
)
718 device_remove_file(&dev
->dev
, &dev_attr_adr
);
719 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
720 device_remove_file(&dev
->dev
, &dev_attr_hid
);
722 device_remove_file(&dev
->dev
, &dev_attr_path
);
724 /* --------------------------------------------------------------------------
726 -------------------------------------------------------------------------- */
728 static const struct acpi_device_id
*__acpi_match_device(
729 struct acpi_device
*device
, const struct acpi_device_id
*ids
)
731 const struct acpi_device_id
*id
;
732 struct acpi_hardware_id
*hwid
;
735 * If the device is not present, it is unnecessary to load device
738 if (!device
->status
.present
)
741 for (id
= ids
; id
->id
[0]; id
++)
742 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
743 if (!strcmp((char *) id
->id
, hwid
->id
))
750 * acpi_match_device - Match a struct device against a given list of ACPI IDs
751 * @ids: Array of struct acpi_device_id object to match against.
752 * @dev: The device structure to match.
754 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
755 * object for that handle and use that object to match against a given list of
758 * Return a pointer to the first matching ID on success or %NULL on failure.
760 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
761 const struct device
*dev
)
763 struct acpi_device
*adev
;
764 acpi_handle handle
= ACPI_HANDLE(dev
);
766 if (!ids
|| !handle
|| acpi_bus_get_device(handle
, &adev
))
769 return __acpi_match_device(adev
, ids
);
771 EXPORT_SYMBOL_GPL(acpi_match_device
);
773 int acpi_match_device_ids(struct acpi_device
*device
,
774 const struct acpi_device_id
*ids
)
776 return __acpi_match_device(device
, ids
) ? 0 : -ENOENT
;
778 EXPORT_SYMBOL(acpi_match_device_ids
);
780 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
784 if (device
->wakeup
.flags
.valid
)
785 acpi_power_resources_list_free(&device
->wakeup
.resources
);
787 if (!device
->flags
.power_manageable
)
790 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
791 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
792 acpi_power_resources_list_free(&ps
->resources
);
796 static void acpi_device_release(struct device
*dev
)
798 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
800 acpi_free_pnp_ids(&acpi_dev
->pnp
);
801 acpi_free_power_resources_lists(acpi_dev
);
805 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
807 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
808 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
810 return acpi_dev
->flags
.match_driver
811 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
814 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
816 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
819 if (list_empty(&acpi_dev
->pnp
.ids
))
822 if (add_uevent_var(env
, "MODALIAS="))
824 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
825 sizeof(env
->buf
) - env
->buflen
);
826 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
832 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
834 struct acpi_device
*device
= data
;
836 device
->driver
->ops
.notify(device
, event
);
839 static acpi_status
acpi_device_notify_fixed(void *data
)
841 struct acpi_device
*device
= data
;
843 /* Fixed hardware devices have no handles */
844 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
848 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
852 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
854 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
855 acpi_device_notify_fixed
,
857 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
859 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
860 acpi_device_notify_fixed
,
863 status
= acpi_install_notify_handler(device
->handle
,
868 if (ACPI_FAILURE(status
))
873 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
875 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
876 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
877 acpi_device_notify_fixed
);
878 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
879 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
880 acpi_device_notify_fixed
);
882 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
886 static int acpi_device_probe(struct device
*dev
)
888 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
889 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
892 if (acpi_dev
->handler
)
895 if (!acpi_drv
->ops
.add
)
898 ret
= acpi_drv
->ops
.add(acpi_dev
);
902 acpi_dev
->driver
= acpi_drv
;
903 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
904 "Driver [%s] successfully bound to device [%s]\n",
905 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
907 if (acpi_drv
->ops
.notify
) {
908 ret
= acpi_device_install_notify_handler(acpi_dev
);
910 if (acpi_drv
->ops
.remove
)
911 acpi_drv
->ops
.remove(acpi_dev
);
913 acpi_dev
->driver
= NULL
;
914 acpi_dev
->driver_data
= NULL
;
919 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found driver [%s] for device [%s]\n",
920 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
925 static int acpi_device_remove(struct device
* dev
)
927 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
928 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
931 if (acpi_drv
->ops
.notify
)
932 acpi_device_remove_notify_handler(acpi_dev
);
933 if (acpi_drv
->ops
.remove
)
934 acpi_drv
->ops
.remove(acpi_dev
);
936 acpi_dev
->driver
= NULL
;
937 acpi_dev
->driver_data
= NULL
;
943 struct bus_type acpi_bus_type
= {
945 .match
= acpi_bus_match
,
946 .probe
= acpi_device_probe
,
947 .remove
= acpi_device_remove
,
948 .uevent
= acpi_device_uevent
,
951 static void acpi_bus_data_handler(acpi_handle handle
, void *context
)
953 /* Intentionally empty. */
956 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
963 status
= acpi_get_data(handle
, acpi_bus_data_handler
, (void **)device
);
964 if (ACPI_FAILURE(status
) || !*device
) {
965 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
971 EXPORT_SYMBOL(acpi_bus_get_device
);
973 int acpi_device_add(struct acpi_device
*device
,
974 void (*release
)(struct device
*))
977 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
980 if (device
->handle
) {
983 status
= acpi_attach_data(device
->handle
, acpi_bus_data_handler
,
985 if (ACPI_FAILURE(status
)) {
986 acpi_handle_err(device
->handle
,
987 "Unable to attach device data\n");
995 * Link this device to its parent and siblings.
997 INIT_LIST_HEAD(&device
->children
);
998 INIT_LIST_HEAD(&device
->node
);
999 INIT_LIST_HEAD(&device
->wakeup_list
);
1000 INIT_LIST_HEAD(&device
->physical_node_list
);
1001 mutex_init(&device
->physical_node_lock
);
1003 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
1005 pr_err(PREFIX
"Memory allocation error\n");
1010 mutex_lock(&acpi_device_lock
);
1012 * Find suitable bus_id and instance number in acpi_bus_id_list
1013 * If failed, create one and link it into acpi_bus_id_list
1015 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
1016 if (!strcmp(acpi_device_bus_id
->bus_id
,
1017 acpi_device_hid(device
))) {
1018 acpi_device_bus_id
->instance_no
++;
1025 acpi_device_bus_id
= new_bus_id
;
1026 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
1027 acpi_device_bus_id
->instance_no
= 0;
1028 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
1030 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
1033 list_add_tail(&device
->node
, &device
->parent
->children
);
1035 if (device
->wakeup
.flags
.valid
)
1036 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
1037 mutex_unlock(&acpi_device_lock
);
1040 device
->dev
.parent
= &device
->parent
->dev
;
1041 device
->dev
.bus
= &acpi_bus_type
;
1042 device
->dev
.release
= release
;
1043 result
= device_add(&device
->dev
);
1045 dev_err(&device
->dev
, "Error registering device\n");
1049 result
= acpi_device_setup_files(device
);
1051 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
1052 dev_name(&device
->dev
));
1057 mutex_lock(&acpi_device_lock
);
1059 list_del(&device
->node
);
1060 list_del(&device
->wakeup_list
);
1061 mutex_unlock(&acpi_device_lock
);
1064 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
1068 static void acpi_device_unregister(struct acpi_device
*device
)
1070 mutex_lock(&acpi_device_lock
);
1072 list_del(&device
->node
);
1074 list_del(&device
->wakeup_list
);
1075 mutex_unlock(&acpi_device_lock
);
1077 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
1079 acpi_power_add_remove_device(device
, false);
1080 acpi_device_remove_files(device
);
1082 device
->remove(device
);
1084 device_del(&device
->dev
);
1086 * Transition the device to D3cold to drop the reference counts of all
1087 * power resources the device depends on and turn off the ones that have
1088 * no more references.
1090 acpi_device_set_power(device
, ACPI_STATE_D3_COLD
);
1091 device
->handle
= NULL
;
1092 put_device(&device
->dev
);
1095 /* --------------------------------------------------------------------------
1097 -------------------------------------------------------------------------- */
1099 * acpi_bus_register_driver - register a driver with the ACPI bus
1100 * @driver: driver being registered
1102 * Registers a driver with the ACPI bus. Searches the namespace for all
1103 * devices that match the driver's criteria and binds. Returns zero for
1104 * success or a negative error status for failure.
1106 int acpi_bus_register_driver(struct acpi_driver
*driver
)
1112 driver
->drv
.name
= driver
->name
;
1113 driver
->drv
.bus
= &acpi_bus_type
;
1114 driver
->drv
.owner
= driver
->owner
;
1116 ret
= driver_register(&driver
->drv
);
1120 EXPORT_SYMBOL(acpi_bus_register_driver
);
1123 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1124 * @driver: driver to unregister
1126 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1127 * devices that match the driver's criteria and unbinds.
1129 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
1131 driver_unregister(&driver
->drv
);
1134 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
1136 /* --------------------------------------------------------------------------
1138 -------------------------------------------------------------------------- */
1139 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
1141 struct acpi_device
*device
= NULL
;
1145 * Fixed hardware devices do not appear in the namespace and do not
1146 * have handles, but we fabricate acpi_devices for them, so we have
1147 * to deal with them specially.
1153 status
= acpi_get_parent(handle
, &handle
);
1154 if (ACPI_FAILURE(status
))
1155 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
1156 } while (acpi_bus_get_device(handle
, &device
));
1161 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
1165 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1166 union acpi_object
*obj
;
1168 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
1169 if (ACPI_FAILURE(status
))
1172 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
1173 if (ACPI_SUCCESS(status
)) {
1174 obj
= buffer
.pointer
;
1175 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
1177 kfree(buffer
.pointer
);
1181 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
1183 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
1184 struct acpi_device_wakeup
*wakeup
)
1186 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1187 union acpi_object
*package
= NULL
;
1188 union acpi_object
*element
= NULL
;
1195 INIT_LIST_HEAD(&wakeup
->resources
);
1198 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
1199 if (ACPI_FAILURE(status
)) {
1200 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
1204 package
= (union acpi_object
*)buffer
.pointer
;
1206 if (!package
|| package
->package
.count
< 2)
1209 element
= &(package
->package
.elements
[0]);
1213 if (element
->type
== ACPI_TYPE_PACKAGE
) {
1214 if ((element
->package
.count
< 2) ||
1215 (element
->package
.elements
[0].type
!=
1216 ACPI_TYPE_LOCAL_REFERENCE
)
1217 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
1220 wakeup
->gpe_device
=
1221 element
->package
.elements
[0].reference
.handle
;
1222 wakeup
->gpe_number
=
1223 (u32
) element
->package
.elements
[1].integer
.value
;
1224 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
1225 wakeup
->gpe_device
= NULL
;
1226 wakeup
->gpe_number
= element
->integer
.value
;
1231 element
= &(package
->package
.elements
[1]);
1232 if (element
->type
!= ACPI_TYPE_INTEGER
)
1235 wakeup
->sleep_state
= element
->integer
.value
;
1237 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
1241 if (!list_empty(&wakeup
->resources
)) {
1244 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
1247 acpi_handle_warn(handle
, "Retrieving current states "
1248 "of wakeup power resources failed\n");
1249 acpi_power_resources_list_free(&wakeup
->resources
);
1252 if (sleep_state
< wakeup
->sleep_state
) {
1253 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
1254 "(S%d) by S%d from power resources\n",
1255 (int)wakeup
->sleep_state
, sleep_state
);
1256 wakeup
->sleep_state
= sleep_state
;
1259 acpi_setup_gpe_for_wake(handle
, wakeup
->gpe_device
, wakeup
->gpe_number
);
1262 kfree(buffer
.pointer
);
1266 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
1268 struct acpi_device_id button_device_ids
[] = {
1275 acpi_event_status event_status
;
1277 device
->wakeup
.flags
.notifier_present
= 0;
1279 /* Power button, Lid switch always enable wakeup */
1280 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1281 device
->wakeup
.flags
.run_wake
= 1;
1282 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1283 /* Do not use Lid/sleep button for S5 wakeup */
1284 if (device
->wakeup
.sleep_state
== ACPI_STATE_S5
)
1285 device
->wakeup
.sleep_state
= ACPI_STATE_S4
;
1287 device_set_wakeup_capable(&device
->dev
, true);
1291 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
1292 device
->wakeup
.gpe_number
,
1294 if (status
== AE_OK
)
1295 device
->wakeup
.flags
.run_wake
=
1296 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
1299 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1303 /* Presence of _PRW indicates wake capable */
1304 if (!acpi_has_method(device
->handle
, "_PRW"))
1307 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1310 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1314 device
->wakeup
.flags
.valid
= 1;
1315 device
->wakeup
.prepare_count
= 0;
1316 acpi_bus_set_run_wake_flags(device
);
1317 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1318 * system for the ACPI device with the _PRW object.
1319 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1320 * So it is necessary to call _DSW object first. Only when it is not
1321 * present will the _PSW object used.
1323 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1325 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1326 "error in _DSW or _PSW evaluation\n"));
1329 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1331 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1332 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1333 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1336 INIT_LIST_HEAD(&ps
->resources
);
1338 /* Evaluate "_PRx" to get referenced power resources */
1339 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1340 if (ACPI_SUCCESS(status
)) {
1341 union acpi_object
*package
= buffer
.pointer
;
1343 if (buffer
.length
&& package
1344 && package
->type
== ACPI_TYPE_PACKAGE
1345 && package
->package
.count
) {
1346 int err
= acpi_extract_power_resources(package
, 0,
1349 device
->power
.flags
.power_resources
= 1;
1351 ACPI_FREE(buffer
.pointer
);
1354 /* Evaluate "_PSx" to see if we can do explicit sets */
1356 if (acpi_has_method(device
->handle
, pathname
))
1357 ps
->flags
.explicit_set
= 1;
1360 * State is valid if there are means to put the device into it.
1361 * D3hot is only valid if _PR3 present.
1363 if (!list_empty(&ps
->resources
)
1364 || (ps
->flags
.explicit_set
&& state
< ACPI_STATE_D3_HOT
)) {
1365 ps
->flags
.valid
= 1;
1366 ps
->flags
.os_accessible
= 1;
1369 ps
->power
= -1; /* Unknown - driver assigned */
1370 ps
->latency
= -1; /* Unknown - driver assigned */
1373 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1377 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1378 if (!acpi_has_method(device
->handle
, "_PS0") &&
1379 !acpi_has_method(device
->handle
, "_PR0"))
1382 device
->flags
.power_manageable
= 1;
1385 * Power Management Flags
1387 if (acpi_has_method(device
->handle
, "_PSC"))
1388 device
->power
.flags
.explicit_get
= 1;
1389 if (acpi_has_method(device
->handle
, "_IRC"))
1390 device
->power
.flags
.inrush_current
= 1;
1393 * Enumerate supported power management states
1395 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1396 acpi_bus_init_power_state(device
, i
);
1398 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1400 /* Set defaults for D0 and D3 states (always valid) */
1401 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1402 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1403 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.valid
= 1;
1404 device
->power
.states
[ACPI_STATE_D3_COLD
].power
= 0;
1406 /* Set D3cold's explicit_set flag if _PS3 exists. */
1407 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1408 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1410 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1411 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1412 device
->power
.flags
.power_resources
)
1413 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1415 if (acpi_bus_init_power(device
)) {
1416 acpi_free_power_resources_lists(device
);
1417 device
->flags
.power_manageable
= 0;
1421 static void acpi_bus_get_flags(struct acpi_device
*device
)
1423 /* Presence of _STA indicates 'dynamic_status' */
1424 if (acpi_has_method(device
->handle
, "_STA"))
1425 device
->flags
.dynamic_status
= 1;
1427 /* Presence of _RMV indicates 'removable' */
1428 if (acpi_has_method(device
->handle
, "_RMV"))
1429 device
->flags
.removable
= 1;
1431 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1432 if (acpi_has_method(device
->handle
, "_EJD") ||
1433 acpi_has_method(device
->handle
, "_EJ0"))
1434 device
->flags
.ejectable
= 1;
1437 static void acpi_device_get_busid(struct acpi_device
*device
)
1439 char bus_id
[5] = { '?', 0 };
1440 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1446 * The device's Bus ID is simply the object name.
1447 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1449 if (ACPI_IS_ROOT_DEVICE(device
)) {
1450 strcpy(device
->pnp
.bus_id
, "ACPI");
1454 switch (device
->device_type
) {
1455 case ACPI_BUS_TYPE_POWER_BUTTON
:
1456 strcpy(device
->pnp
.bus_id
, "PWRF");
1458 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1459 strcpy(device
->pnp
.bus_id
, "SLPF");
1462 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1463 /* Clean up trailing underscores (if any) */
1464 for (i
= 3; i
> 1; i
--) {
1465 if (bus_id
[i
] == '_')
1470 strcpy(device
->pnp
.bus_id
, bus_id
);
1476 * acpi_ata_match - see if an acpi object is an ATA device
1478 * If an acpi object has one of the ACPI ATA methods defined,
1479 * then we can safely call it an ATA device.
1481 bool acpi_ata_match(acpi_handle handle
)
1483 return acpi_has_method(handle
, "_GTF") ||
1484 acpi_has_method(handle
, "_GTM") ||
1485 acpi_has_method(handle
, "_STM") ||
1486 acpi_has_method(handle
, "_SDD");
1490 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1492 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1493 * then we can safely call it an ejectable drive bay
1495 bool acpi_bay_match(acpi_handle handle
)
1497 acpi_handle phandle
;
1499 if (!acpi_has_method(handle
, "_EJ0"))
1501 if (acpi_ata_match(handle
))
1503 if (ACPI_FAILURE(acpi_get_parent(handle
, &phandle
)))
1506 return acpi_ata_match(phandle
);
1510 * acpi_dock_match - see if an acpi object has a _DCK method
1512 bool acpi_dock_match(acpi_handle handle
)
1514 return acpi_has_method(handle
, "_DCK");
1517 const char *acpi_device_hid(struct acpi_device
*device
)
1519 struct acpi_hardware_id
*hid
;
1521 if (list_empty(&device
->pnp
.ids
))
1524 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1527 EXPORT_SYMBOL(acpi_device_hid
);
1529 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1531 struct acpi_hardware_id
*id
;
1533 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1537 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1543 list_add_tail(&id
->list
, &pnp
->ids
);
1544 pnp
->type
.hardware_id
= 1;
1548 * Old IBM workstations have a DSDT bug wherein the SMBus object
1549 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1550 * prefix. Work around this.
1552 static bool acpi_ibm_smbus_match(acpi_handle handle
)
1554 char node_name
[ACPI_PATH_SEGMENT_LENGTH
];
1555 struct acpi_buffer path
= { sizeof(node_name
), node_name
};
1557 if (!dmi_name_in_vendors("IBM"))
1560 /* Look for SMBS object */
1561 if (ACPI_FAILURE(acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
)) ||
1562 strcmp("SMBS", path
.pointer
))
1565 /* Does it have the necessary (but misnamed) methods? */
1566 if (acpi_has_method(handle
, "SBI") &&
1567 acpi_has_method(handle
, "SBR") &&
1568 acpi_has_method(handle
, "SBW"))
1574 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
1578 struct acpi_device_info
*info
;
1579 struct acpi_pnp_device_id_list
*cid_list
;
1582 switch (device_type
) {
1583 case ACPI_BUS_TYPE_DEVICE
:
1584 if (handle
== ACPI_ROOT_OBJECT
) {
1585 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
1589 status
= acpi_get_object_info(handle
, &info
);
1590 if (ACPI_FAILURE(status
)) {
1591 pr_err(PREFIX
"%s: Error reading device info\n",
1596 if (info
->valid
& ACPI_VALID_HID
)
1597 acpi_add_id(pnp
, info
->hardware_id
.string
);
1598 if (info
->valid
& ACPI_VALID_CID
) {
1599 cid_list
= &info
->compatible_id_list
;
1600 for (i
= 0; i
< cid_list
->count
; i
++)
1601 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
1603 if (info
->valid
& ACPI_VALID_ADR
) {
1604 pnp
->bus_address
= info
->address
;
1605 pnp
->type
.bus_address
= 1;
1607 if (info
->valid
& ACPI_VALID_UID
)
1608 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
1614 * Some devices don't reliably have _HIDs & _CIDs, so add
1615 * synthetic HIDs to make sure drivers can find them.
1617 if (acpi_is_video_device(handle
))
1618 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
1619 else if (acpi_bay_match(handle
))
1620 acpi_add_id(pnp
, ACPI_BAY_HID
);
1621 else if (acpi_dock_match(handle
))
1622 acpi_add_id(pnp
, ACPI_DOCK_HID
);
1623 else if (acpi_ibm_smbus_match(handle
))
1624 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
1625 else if (list_empty(&pnp
->ids
) && handle
== ACPI_ROOT_OBJECT
) {
1626 acpi_add_id(pnp
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1627 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
1628 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
1632 case ACPI_BUS_TYPE_POWER
:
1633 acpi_add_id(pnp
, ACPI_POWER_HID
);
1635 case ACPI_BUS_TYPE_PROCESSOR
:
1636 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
1638 case ACPI_BUS_TYPE_THERMAL
:
1639 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
1641 case ACPI_BUS_TYPE_POWER_BUTTON
:
1642 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
1644 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1645 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
1650 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
1652 struct acpi_hardware_id
*id
, *tmp
;
1654 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
1658 kfree(pnp
->unique_id
);
1661 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
1662 int type
, unsigned long long sta
)
1664 INIT_LIST_HEAD(&device
->pnp
.ids
);
1665 device
->device_type
= type
;
1666 device
->handle
= handle
;
1667 device
->parent
= acpi_bus_get_parent(handle
);
1668 STRUCT_TO_INT(device
->status
) = sta
;
1669 acpi_device_get_busid(device
);
1670 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
1671 acpi_bus_get_flags(device
);
1672 device
->flags
.match_driver
= false;
1673 device_initialize(&device
->dev
);
1674 dev_set_uevent_suppress(&device
->dev
, true);
1677 void acpi_device_add_finalize(struct acpi_device
*device
)
1679 device
->flags
.match_driver
= true;
1680 dev_set_uevent_suppress(&device
->dev
, false);
1681 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
1684 static int acpi_add_single_object(struct acpi_device
**child
,
1685 acpi_handle handle
, int type
,
1686 unsigned long long sta
)
1689 struct acpi_device
*device
;
1690 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1692 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1694 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1698 acpi_init_device_object(device
, handle
, type
, sta
);
1699 acpi_bus_get_power_flags(device
);
1700 acpi_bus_get_wakeup_device_flags(device
);
1702 result
= acpi_device_add(device
, acpi_device_release
);
1704 acpi_device_release(&device
->dev
);
1708 acpi_power_add_remove_device(device
, true);
1709 acpi_device_add_finalize(device
);
1710 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1711 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
1712 dev_name(&device
->dev
), (char *) buffer
.pointer
,
1713 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
1714 kfree(buffer
.pointer
);
1719 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1720 unsigned long long *sta
)
1723 acpi_object_type acpi_type
;
1725 status
= acpi_get_type(handle
, &acpi_type
);
1726 if (ACPI_FAILURE(status
))
1729 switch (acpi_type
) {
1730 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1731 case ACPI_TYPE_DEVICE
:
1732 *type
= ACPI_BUS_TYPE_DEVICE
;
1733 status
= acpi_bus_get_status_handle(handle
, sta
);
1734 if (ACPI_FAILURE(status
))
1737 case ACPI_TYPE_PROCESSOR
:
1738 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1739 status
= acpi_bus_get_status_handle(handle
, sta
);
1740 if (ACPI_FAILURE(status
))
1743 case ACPI_TYPE_THERMAL
:
1744 *type
= ACPI_BUS_TYPE_THERMAL
;
1745 *sta
= ACPI_STA_DEFAULT
;
1747 case ACPI_TYPE_POWER
:
1748 *type
= ACPI_BUS_TYPE_POWER
;
1749 *sta
= ACPI_STA_DEFAULT
;
1758 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
1760 const struct acpi_device_id
**matchid
)
1762 const struct acpi_device_id
*devid
;
1764 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
1765 if (!strcmp((char *)devid
->id
, idstr
)) {
1775 static struct acpi_scan_handler
*acpi_scan_match_handler(char *idstr
,
1776 const struct acpi_device_id
**matchid
)
1778 struct acpi_scan_handler
*handler
;
1780 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
1781 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
1787 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
1789 if (!!hotplug
->enabled
== !!val
)
1792 mutex_lock(&acpi_scan_lock
);
1794 hotplug
->enabled
= val
;
1796 mutex_unlock(&acpi_scan_lock
);
1799 static void acpi_scan_init_hotplug(acpi_handle handle
, int type
)
1801 struct acpi_device_pnp pnp
= {};
1802 struct acpi_hardware_id
*hwid
;
1803 struct acpi_scan_handler
*handler
;
1805 INIT_LIST_HEAD(&pnp
.ids
);
1806 acpi_set_pnp_ids(handle
, &pnp
, type
);
1808 if (!pnp
.type
.hardware_id
)
1812 * This relies on the fact that acpi_install_notify_handler() will not
1813 * install the same notify handler routine twice for the same handle.
1815 list_for_each_entry(hwid
, &pnp
.ids
, list
) {
1816 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
1818 acpi_install_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
1819 acpi_hotplug_notify_cb
, handler
);
1825 acpi_free_pnp_ids(&pnp
);
1828 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
1829 void *not_used
, void **return_value
)
1831 struct acpi_device
*device
= NULL
;
1833 unsigned long long sta
;
1836 acpi_bus_get_device(handle
, &device
);
1840 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1844 if (type
== ACPI_BUS_TYPE_POWER
) {
1845 acpi_add_power_resource(handle
);
1849 acpi_scan_init_hotplug(handle
, type
);
1851 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1852 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
)) {
1853 struct acpi_device_wakeup wakeup
;
1855 if (acpi_has_method(handle
, "_PRW")) {
1856 acpi_bus_extract_wakeup_device_power_package(handle
,
1858 acpi_power_resources_list_free(&wakeup
.resources
);
1860 return AE_CTRL_DEPTH
;
1863 acpi_add_single_object(&device
, handle
, type
, sta
);
1865 return AE_CTRL_DEPTH
;
1869 *return_value
= device
;
1874 static int acpi_scan_attach_handler(struct acpi_device
*device
)
1876 struct acpi_hardware_id
*hwid
;
1879 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1880 const struct acpi_device_id
*devid
;
1881 struct acpi_scan_handler
*handler
;
1883 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
1885 ret
= handler
->attach(device
, devid
);
1887 device
->handler
= handler
;
1889 } else if (ret
< 0) {
1897 static acpi_status
acpi_bus_device_attach(acpi_handle handle
, u32 lvl_not_used
,
1898 void *not_used
, void **ret_not_used
)
1900 struct acpi_device
*device
;
1901 unsigned long long sta_not_used
;
1905 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1906 * namespace walks prematurely.
1908 if (acpi_bus_type_and_status(handle
, &ret
, &sta_not_used
))
1911 if (acpi_bus_get_device(handle
, &device
))
1912 return AE_CTRL_DEPTH
;
1914 if (device
->handler
)
1917 ret
= acpi_scan_attach_handler(device
);
1919 return ret
> 0 ? AE_OK
: AE_CTRL_DEPTH
;
1921 ret
= device_attach(&device
->dev
);
1922 return ret
>= 0 ? AE_OK
: AE_CTRL_DEPTH
;
1926 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1927 * @handle: Root of the namespace scope to scan.
1929 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1932 * If no devices were found, -ENODEV is returned, but it does not mean that
1933 * there has been a real error. There just have been no suitable ACPI objects
1934 * in the table trunk from which the kernel could create a device and add an
1935 * appropriate driver.
1937 * Must be called under acpi_scan_lock.
1939 int acpi_bus_scan(acpi_handle handle
)
1941 void *device
= NULL
;
1944 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
1945 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1946 acpi_bus_check_add
, NULL
, NULL
, &device
);
1950 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle
, 0, NULL
, NULL
)))
1951 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1952 acpi_bus_device_attach
, NULL
, NULL
, NULL
);
1956 EXPORT_SYMBOL(acpi_bus_scan
);
1958 static acpi_status
acpi_bus_device_detach(acpi_handle handle
, u32 lvl_not_used
,
1959 void *not_used
, void **ret_not_used
)
1961 struct acpi_device
*device
= NULL
;
1963 if (!acpi_bus_get_device(handle
, &device
)) {
1964 struct acpi_scan_handler
*dev_handler
= device
->handler
;
1967 if (dev_handler
->detach
)
1968 dev_handler
->detach(device
);
1970 device
->handler
= NULL
;
1972 device_release_driver(&device
->dev
);
1978 static acpi_status
acpi_bus_remove(acpi_handle handle
, u32 lvl_not_used
,
1979 void *not_used
, void **ret_not_used
)
1981 struct acpi_device
*device
= NULL
;
1983 if (!acpi_bus_get_device(handle
, &device
))
1984 acpi_device_unregister(device
);
1990 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1991 * @start: Root of the ACPI device nodes subtree to remove.
1993 * Must be called under acpi_scan_lock.
1995 void acpi_bus_trim(struct acpi_device
*start
)
1998 * Execute acpi_bus_device_detach() as a post-order callback to detach
1999 * all ACPI drivers from the device nodes being removed.
2001 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
2002 acpi_bus_device_detach
, NULL
, NULL
);
2003 acpi_bus_device_detach(start
->handle
, 0, NULL
, NULL
);
2005 * Execute acpi_bus_remove() as a post-order callback to remove device
2006 * nodes in the given namespace scope.
2008 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
2009 acpi_bus_remove
, NULL
, NULL
);
2010 acpi_bus_remove(start
->handle
, 0, NULL
, NULL
);
2012 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
2014 static int acpi_bus_scan_fixed(void)
2019 * Enumerate all fixed-feature devices.
2021 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
2022 struct acpi_device
*device
= NULL
;
2024 result
= acpi_add_single_object(&device
, NULL
,
2025 ACPI_BUS_TYPE_POWER_BUTTON
,
2030 result
= device_attach(&device
->dev
);
2034 device_init_wakeup(&device
->dev
, true);
2037 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
2038 struct acpi_device
*device
= NULL
;
2040 result
= acpi_add_single_object(&device
, NULL
,
2041 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2046 result
= device_attach(&device
->dev
);
2049 return result
< 0 ? result
: 0;
2052 int __init
acpi_scan_init(void)
2056 result
= bus_register(&acpi_bus_type
);
2058 /* We don't want to quit even if we failed to add suspend/resume */
2059 printk(KERN_ERR PREFIX
"Could not register bus type\n");
2062 acpi_pci_root_init();
2063 acpi_pci_link_init();
2064 acpi_processor_init();
2065 acpi_platform_init();
2067 acpi_cmos_rtc_init();
2068 acpi_container_init();
2069 acpi_memory_hotplug_init();
2072 mutex_lock(&acpi_scan_lock
);
2074 * Enumerate devices in the ACPI namespace.
2076 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2080 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2084 result
= acpi_bus_scan_fixed();
2086 acpi_device_unregister(acpi_root
);
2090 acpi_update_all_gpes();
2092 acpi_pci_root_hp_init();
2095 mutex_unlock(&acpi_scan_lock
);