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(acpi_handle handle
, u32 lvl
, void *data
,
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 if (device
->handler
&& !device
->handler
->hotplug
.enabled
) {
140 *ret_p
= &device
->dev
;
144 mutex_lock(&device
->physical_node_lock
);
146 list_for_each_entry(pn
, &device
->physical_node_list
, node
) {
150 /* Skip devices offlined by the first pass. */
154 pn
->put_online
= false;
156 ret
= device_offline(pn
->dev
);
157 if (acpi_force_hot_remove
)
161 pn
->put_online
= !ret
;
171 mutex_unlock(&device
->physical_node_lock
);
176 static acpi_status
acpi_bus_online(acpi_handle handle
, u32 lvl
, void *data
,
179 struct acpi_device
*device
= NULL
;
180 struct acpi_device_physical_node
*pn
;
182 if (acpi_bus_get_device(handle
, &device
))
185 mutex_lock(&device
->physical_node_lock
);
187 list_for_each_entry(pn
, &device
->physical_node_list
, node
)
188 if (pn
->put_online
) {
189 device_online(pn
->dev
);
190 pn
->put_online
= false;
193 mutex_unlock(&device
->physical_node_lock
);
198 static int acpi_scan_hot_remove(struct acpi_device
*device
)
200 acpi_handle handle
= device
->handle
;
201 struct device
*errdev
;
203 unsigned long long sta
;
205 /* If there is no handle, the device node has been unregistered. */
207 dev_dbg(&device
->dev
, "ACPI handle missing\n");
208 put_device(&device
->dev
);
213 * Carry out two passes here and ignore errors in the first pass,
214 * because if the devices in question are memory blocks and
215 * CONFIG_MEMCG is set, one of the blocks may hold data structures
216 * that the other blocks depend on, but it is not known in advance which
219 * If the first pass is successful, the second one isn't needed, though.
222 status
= acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
223 NULL
, acpi_bus_offline
, (void *)false,
225 if (status
== AE_SUPPORT
) {
226 dev_warn(errdev
, "Offline disabled.\n");
227 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
228 acpi_bus_online
, NULL
, NULL
, NULL
);
229 put_device(&device
->dev
);
232 acpi_bus_offline(handle
, 0, (void *)false, (void **)&errdev
);
235 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
236 NULL
, acpi_bus_offline
, (void *)true,
238 if (!errdev
|| acpi_force_hot_remove
)
239 acpi_bus_offline(handle
, 0, (void *)true,
242 if (errdev
&& !acpi_force_hot_remove
) {
243 dev_warn(errdev
, "Offline failed.\n");
244 acpi_bus_online(handle
, 0, NULL
, NULL
);
245 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
,
246 ACPI_UINT32_MAX
, acpi_bus_online
,
248 put_device(&device
->dev
);
253 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
254 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
256 acpi_bus_trim(device
);
258 /* Device node has been unregistered. */
259 put_device(&device
->dev
);
262 acpi_evaluate_lck(handle
, 0);
266 status
= acpi_evaluate_ej0(handle
);
267 if (status
== AE_NOT_FOUND
)
269 else if (ACPI_FAILURE(status
))
273 * Verify if eject was indeed successful. If not, log an error
274 * message. No need to call _OST since _EJ0 call was made OK.
276 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
277 if (ACPI_FAILURE(status
)) {
278 acpi_handle_warn(handle
,
279 "Status check after eject failed (0x%x)\n", status
);
280 } else if (sta
& ACPI_STA_DEVICE_ENABLED
) {
281 acpi_handle_warn(handle
,
282 "Eject incomplete - status 0x%llx\n", sta
);
288 void acpi_bus_device_eject(void *data
, u32 ost_src
)
290 struct acpi_device
*device
= data
;
291 acpi_handle handle
= device
->handle
;
292 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
295 lock_device_hotplug();
296 mutex_lock(&acpi_scan_lock
);
298 if (ost_src
== ACPI_NOTIFY_EJECT_REQUEST
)
299 acpi_evaluate_hotplug_ost(handle
, ACPI_NOTIFY_EJECT_REQUEST
,
300 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
302 if (device
->handler
&& device
->handler
->hotplug
.mode
== AHM_CONTAINER
)
303 kobject_uevent(&device
->dev
.kobj
, KOBJ_OFFLINE
);
305 error
= acpi_scan_hot_remove(device
);
306 if (error
== -EPERM
) {
313 mutex_unlock(&acpi_scan_lock
);
314 unlock_device_hotplug();
318 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
320 acpi_evaluate_hotplug_ost(handle
, ost_src
, ost_code
, NULL
);
324 static void acpi_scan_bus_device_check(void *data
, u32 ost_source
)
326 acpi_handle handle
= data
;
327 struct acpi_device
*device
= NULL
;
328 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
331 lock_device_hotplug();
332 mutex_lock(&acpi_scan_lock
);
334 if (ost_source
!= ACPI_NOTIFY_BUS_CHECK
) {
335 acpi_bus_get_device(handle
, &device
);
337 dev_warn(&device
->dev
, "Attempt to re-insert\n");
341 error
= acpi_bus_scan(handle
);
343 acpi_handle_warn(handle
, "Namespace scan failure\n");
346 error
= acpi_bus_get_device(handle
, &device
);
348 acpi_handle_warn(handle
, "Missing device node object\n");
351 ost_code
= ACPI_OST_SC_SUCCESS
;
352 if (device
->handler
&& device
->handler
->hotplug
.mode
== AHM_CONTAINER
)
353 kobject_uevent(&device
->dev
.kobj
, KOBJ_ONLINE
);
356 acpi_evaluate_hotplug_ost(handle
, ost_source
, ost_code
, NULL
);
357 mutex_unlock(&acpi_scan_lock
);
358 unlock_device_hotplug();
361 static void acpi_hotplug_unsupported(acpi_handle handle
, u32 type
)
366 case ACPI_NOTIFY_BUS_CHECK
:
367 acpi_handle_debug(handle
,
368 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
369 ost_status
= ACPI_OST_SC_INSERT_NOT_SUPPORTED
;
371 case ACPI_NOTIFY_DEVICE_CHECK
:
372 acpi_handle_debug(handle
,
373 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
374 ost_status
= ACPI_OST_SC_INSERT_NOT_SUPPORTED
;
376 case ACPI_NOTIFY_EJECT_REQUEST
:
377 acpi_handle_debug(handle
,
378 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
379 ost_status
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
382 /* non-hotplug event; possibly handled by other handler */
386 acpi_evaluate_hotplug_ost(handle
, type
, ost_status
, NULL
);
389 static void acpi_hotplug_notify_cb(acpi_handle handle
, u32 type
, void *data
)
391 struct acpi_scan_handler
*handler
= data
;
392 struct acpi_device
*adev
;
395 if (!handler
->hotplug
.enabled
)
396 return acpi_hotplug_unsupported(handle
, type
);
399 case ACPI_NOTIFY_BUS_CHECK
:
400 acpi_handle_debug(handle
, "ACPI_NOTIFY_BUS_CHECK event\n");
402 case ACPI_NOTIFY_DEVICE_CHECK
:
403 acpi_handle_debug(handle
, "ACPI_NOTIFY_DEVICE_CHECK event\n");
405 case ACPI_NOTIFY_EJECT_REQUEST
:
406 acpi_handle_debug(handle
, "ACPI_NOTIFY_EJECT_REQUEST event\n");
407 if (acpi_bus_get_device(handle
, &adev
))
410 get_device(&adev
->dev
);
411 status
= acpi_hotplug_execute(acpi_bus_device_eject
, adev
, type
);
412 if (ACPI_SUCCESS(status
))
415 put_device(&adev
->dev
);
418 /* non-hotplug event; possibly handled by other handler */
421 status
= acpi_hotplug_execute(acpi_scan_bus_device_check
, handle
, type
);
422 if (ACPI_SUCCESS(status
))
426 acpi_evaluate_hotplug_ost(handle
, type
,
427 ACPI_OST_SC_NON_SPECIFIC_FAILURE
, NULL
);
430 static ssize_t
real_power_state_show(struct device
*dev
,
431 struct device_attribute
*attr
, char *buf
)
433 struct acpi_device
*adev
= to_acpi_device(dev
);
437 ret
= acpi_device_get_power(adev
, &state
);
441 return sprintf(buf
, "%s\n", acpi_power_state_string(state
));
444 static DEVICE_ATTR(real_power_state
, 0444, real_power_state_show
, NULL
);
446 static ssize_t
power_state_show(struct device
*dev
,
447 struct device_attribute
*attr
, char *buf
)
449 struct acpi_device
*adev
= to_acpi_device(dev
);
451 return sprintf(buf
, "%s\n", acpi_power_state_string(adev
->power
.state
));
454 static DEVICE_ATTR(power_state
, 0444, power_state_show
, NULL
);
457 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
458 const char *buf
, size_t count
)
460 struct acpi_device
*acpi_device
= to_acpi_device(d
);
461 acpi_object_type not_used
;
464 if (!count
|| buf
[0] != '1')
467 if ((!acpi_device
->handler
|| !acpi_device
->handler
->hotplug
.enabled
)
468 && !acpi_device
->driver
)
471 status
= acpi_get_type(acpi_device
->handle
, ¬_used
);
472 if (ACPI_FAILURE(status
) || !acpi_device
->flags
.ejectable
)
475 acpi_evaluate_hotplug_ost(acpi_device
->handle
, ACPI_OST_EC_OSPM_EJECT
,
476 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
477 get_device(&acpi_device
->dev
);
478 status
= acpi_hotplug_execute(acpi_bus_device_eject
, acpi_device
,
479 ACPI_OST_EC_OSPM_EJECT
);
480 if (ACPI_SUCCESS(status
))
483 put_device(&acpi_device
->dev
);
484 acpi_evaluate_hotplug_ost(acpi_device
->handle
, ACPI_OST_EC_OSPM_EJECT
,
485 ACPI_OST_SC_NON_SPECIFIC_FAILURE
, NULL
);
486 return status
== AE_NO_MEMORY
? -ENOMEM
: -EAGAIN
;
489 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
492 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
493 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
495 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
497 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
499 static ssize_t
acpi_device_uid_show(struct device
*dev
,
500 struct device_attribute
*attr
, char *buf
)
502 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
504 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
506 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
508 static ssize_t
acpi_device_adr_show(struct device
*dev
,
509 struct device_attribute
*attr
, char *buf
)
511 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
513 return sprintf(buf
, "0x%08x\n",
514 (unsigned int)(acpi_dev
->pnp
.bus_address
));
516 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
519 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
520 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
521 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
524 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
528 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
533 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
535 /* sysfs file that shows description text from the ACPI _STR method */
536 static ssize_t
description_show(struct device
*dev
,
537 struct device_attribute
*attr
,
539 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
542 if (acpi_dev
->pnp
.str_obj
== NULL
)
546 * The _STR object contains a Unicode identifier for a device.
547 * We need to convert to utf-8 so it can be displayed.
549 result
= utf16s_to_utf8s(
550 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
551 acpi_dev
->pnp
.str_obj
->buffer
.length
,
552 UTF16_LITTLE_ENDIAN
, buf
,
555 buf
[result
++] = '\n';
559 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
562 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
564 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
566 return sprintf(buf
, "%lu\n", acpi_dev
->pnp
.sun
);
568 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
570 static int acpi_device_setup_files(struct acpi_device
*dev
)
572 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
574 unsigned long long sun
;
578 * Devices gotten from FADT don't have a "path" attribute
581 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
586 if (!list_empty(&dev
->pnp
.ids
)) {
587 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
591 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
597 * If device has _STR, 'description' file is created
599 if (acpi_has_method(dev
->handle
, "_STR")) {
600 status
= acpi_evaluate_object(dev
->handle
, "_STR",
602 if (ACPI_FAILURE(status
))
603 buffer
.pointer
= NULL
;
604 dev
->pnp
.str_obj
= buffer
.pointer
;
605 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
610 if (dev
->pnp
.type
.bus_address
)
611 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
612 if (dev
->pnp
.unique_id
)
613 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
615 status
= acpi_evaluate_integer(dev
->handle
, "_SUN", NULL
, &sun
);
616 if (ACPI_SUCCESS(status
)) {
617 dev
->pnp
.sun
= (unsigned long)sun
;
618 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
622 dev
->pnp
.sun
= (unsigned long)-1;
626 * If device has _EJ0, 'eject' file is created that is used to trigger
627 * hot-removal function from userland.
629 if (acpi_has_method(dev
->handle
, "_EJ0")) {
630 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
635 if (dev
->flags
.power_manageable
) {
636 result
= device_create_file(&dev
->dev
, &dev_attr_power_state
);
640 if (dev
->power
.flags
.power_resources
)
641 result
= device_create_file(&dev
->dev
,
642 &dev_attr_real_power_state
);
649 static void acpi_device_remove_files(struct acpi_device
*dev
)
651 if (dev
->flags
.power_manageable
) {
652 device_remove_file(&dev
->dev
, &dev_attr_power_state
);
653 if (dev
->power
.flags
.power_resources
)
654 device_remove_file(&dev
->dev
,
655 &dev_attr_real_power_state
);
659 * If device has _STR, remove 'description' file
661 if (acpi_has_method(dev
->handle
, "_STR")) {
662 kfree(dev
->pnp
.str_obj
);
663 device_remove_file(&dev
->dev
, &dev_attr_description
);
666 * If device has _EJ0, remove 'eject' file.
668 if (acpi_has_method(dev
->handle
, "_EJ0"))
669 device_remove_file(&dev
->dev
, &dev_attr_eject
);
671 if (acpi_has_method(dev
->handle
, "_SUN"))
672 device_remove_file(&dev
->dev
, &dev_attr_sun
);
674 if (dev
->pnp
.unique_id
)
675 device_remove_file(&dev
->dev
, &dev_attr_uid
);
676 if (dev
->pnp
.type
.bus_address
)
677 device_remove_file(&dev
->dev
, &dev_attr_adr
);
678 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
679 device_remove_file(&dev
->dev
, &dev_attr_hid
);
681 device_remove_file(&dev
->dev
, &dev_attr_path
);
683 /* --------------------------------------------------------------------------
685 -------------------------------------------------------------------------- */
687 static const struct acpi_device_id
*__acpi_match_device(
688 struct acpi_device
*device
, const struct acpi_device_id
*ids
)
690 const struct acpi_device_id
*id
;
691 struct acpi_hardware_id
*hwid
;
694 * If the device is not present, it is unnecessary to load device
697 if (!device
->status
.present
)
700 for (id
= ids
; id
->id
[0]; id
++)
701 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
702 if (!strcmp((char *) id
->id
, hwid
->id
))
709 * acpi_match_device - Match a struct device against a given list of ACPI IDs
710 * @ids: Array of struct acpi_device_id object to match against.
711 * @dev: The device structure to match.
713 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
714 * object for that handle and use that object to match against a given list of
717 * Return a pointer to the first matching ID on success or %NULL on failure.
719 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
720 const struct device
*dev
)
722 struct acpi_device
*adev
;
723 acpi_handle handle
= ACPI_HANDLE(dev
);
725 if (!ids
|| !handle
|| acpi_bus_get_device(handle
, &adev
))
728 return __acpi_match_device(adev
, ids
);
730 EXPORT_SYMBOL_GPL(acpi_match_device
);
732 int acpi_match_device_ids(struct acpi_device
*device
,
733 const struct acpi_device_id
*ids
)
735 return __acpi_match_device(device
, ids
) ? 0 : -ENOENT
;
737 EXPORT_SYMBOL(acpi_match_device_ids
);
739 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
743 if (device
->wakeup
.flags
.valid
)
744 acpi_power_resources_list_free(&device
->wakeup
.resources
);
746 if (!device
->flags
.power_manageable
)
749 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
750 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
751 acpi_power_resources_list_free(&ps
->resources
);
755 static void acpi_device_release(struct device
*dev
)
757 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
759 acpi_free_pnp_ids(&acpi_dev
->pnp
);
760 acpi_free_power_resources_lists(acpi_dev
);
764 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
766 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
767 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
769 return acpi_dev
->flags
.match_driver
770 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
773 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
775 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
778 if (list_empty(&acpi_dev
->pnp
.ids
))
781 if (add_uevent_var(env
, "MODALIAS="))
783 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
784 sizeof(env
->buf
) - env
->buflen
);
785 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
791 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
793 struct acpi_device
*device
= data
;
795 device
->driver
->ops
.notify(device
, event
);
798 static acpi_status
acpi_device_notify_fixed(void *data
)
800 struct acpi_device
*device
= data
;
802 /* Fixed hardware devices have no handles */
803 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
807 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
811 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
813 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
814 acpi_device_notify_fixed
,
816 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
818 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
819 acpi_device_notify_fixed
,
822 status
= acpi_install_notify_handler(device
->handle
,
827 if (ACPI_FAILURE(status
))
832 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
834 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
835 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
836 acpi_device_notify_fixed
);
837 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
838 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
839 acpi_device_notify_fixed
);
841 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
845 static int acpi_device_probe(struct device
*dev
)
847 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
848 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
851 if (acpi_dev
->handler
)
854 if (!acpi_drv
->ops
.add
)
857 ret
= acpi_drv
->ops
.add(acpi_dev
);
861 acpi_dev
->driver
= acpi_drv
;
862 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
863 "Driver [%s] successfully bound to device [%s]\n",
864 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
866 if (acpi_drv
->ops
.notify
) {
867 ret
= acpi_device_install_notify_handler(acpi_dev
);
869 if (acpi_drv
->ops
.remove
)
870 acpi_drv
->ops
.remove(acpi_dev
);
872 acpi_dev
->driver
= NULL
;
873 acpi_dev
->driver_data
= NULL
;
878 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found driver [%s] for device [%s]\n",
879 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
884 static int acpi_device_remove(struct device
* dev
)
886 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
887 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
890 if (acpi_drv
->ops
.notify
)
891 acpi_device_remove_notify_handler(acpi_dev
);
892 if (acpi_drv
->ops
.remove
)
893 acpi_drv
->ops
.remove(acpi_dev
);
895 acpi_dev
->driver
= NULL
;
896 acpi_dev
->driver_data
= NULL
;
902 struct bus_type acpi_bus_type
= {
904 .match
= acpi_bus_match
,
905 .probe
= acpi_device_probe
,
906 .remove
= acpi_device_remove
,
907 .uevent
= acpi_device_uevent
,
910 static void acpi_bus_data_handler(acpi_handle handle
, void *context
)
912 /* Intentionally empty. */
915 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
922 status
= acpi_get_data(handle
, acpi_bus_data_handler
, (void **)device
);
923 if (ACPI_FAILURE(status
) || !*device
) {
924 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
930 EXPORT_SYMBOL(acpi_bus_get_device
);
932 int acpi_device_add(struct acpi_device
*device
,
933 void (*release
)(struct device
*))
936 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
939 if (device
->handle
) {
942 status
= acpi_attach_data(device
->handle
, acpi_bus_data_handler
,
944 if (ACPI_FAILURE(status
)) {
945 acpi_handle_err(device
->handle
,
946 "Unable to attach device data\n");
954 * Link this device to its parent and siblings.
956 INIT_LIST_HEAD(&device
->children
);
957 INIT_LIST_HEAD(&device
->node
);
958 INIT_LIST_HEAD(&device
->wakeup_list
);
959 INIT_LIST_HEAD(&device
->physical_node_list
);
960 mutex_init(&device
->physical_node_lock
);
962 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
964 pr_err(PREFIX
"Memory allocation error\n");
969 mutex_lock(&acpi_device_lock
);
971 * Find suitable bus_id and instance number in acpi_bus_id_list
972 * If failed, create one and link it into acpi_bus_id_list
974 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
975 if (!strcmp(acpi_device_bus_id
->bus_id
,
976 acpi_device_hid(device
))) {
977 acpi_device_bus_id
->instance_no
++;
984 acpi_device_bus_id
= new_bus_id
;
985 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
986 acpi_device_bus_id
->instance_no
= 0;
987 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
989 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
992 list_add_tail(&device
->node
, &device
->parent
->children
);
994 if (device
->wakeup
.flags
.valid
)
995 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
996 mutex_unlock(&acpi_device_lock
);
999 device
->dev
.parent
= &device
->parent
->dev
;
1000 device
->dev
.bus
= &acpi_bus_type
;
1001 device
->dev
.release
= release
;
1002 result
= device_add(&device
->dev
);
1004 dev_err(&device
->dev
, "Error registering device\n");
1008 result
= acpi_device_setup_files(device
);
1010 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
1011 dev_name(&device
->dev
));
1016 mutex_lock(&acpi_device_lock
);
1018 list_del(&device
->node
);
1019 list_del(&device
->wakeup_list
);
1020 mutex_unlock(&acpi_device_lock
);
1023 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
1027 static void acpi_device_unregister(struct acpi_device
*device
)
1029 mutex_lock(&acpi_device_lock
);
1031 list_del(&device
->node
);
1033 list_del(&device
->wakeup_list
);
1034 mutex_unlock(&acpi_device_lock
);
1036 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
1038 acpi_power_add_remove_device(device
, false);
1039 acpi_device_remove_files(device
);
1041 device
->remove(device
);
1043 device_del(&device
->dev
);
1045 * Transition the device to D3cold to drop the reference counts of all
1046 * power resources the device depends on and turn off the ones that have
1047 * no more references.
1049 acpi_device_set_power(device
, ACPI_STATE_D3_COLD
);
1050 device
->handle
= NULL
;
1051 put_device(&device
->dev
);
1054 /* --------------------------------------------------------------------------
1056 -------------------------------------------------------------------------- */
1058 * acpi_bus_register_driver - register a driver with the ACPI bus
1059 * @driver: driver being registered
1061 * Registers a driver with the ACPI bus. Searches the namespace for all
1062 * devices that match the driver's criteria and binds. Returns zero for
1063 * success or a negative error status for failure.
1065 int acpi_bus_register_driver(struct acpi_driver
*driver
)
1071 driver
->drv
.name
= driver
->name
;
1072 driver
->drv
.bus
= &acpi_bus_type
;
1073 driver
->drv
.owner
= driver
->owner
;
1075 ret
= driver_register(&driver
->drv
);
1079 EXPORT_SYMBOL(acpi_bus_register_driver
);
1082 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1083 * @driver: driver to unregister
1085 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1086 * devices that match the driver's criteria and unbinds.
1088 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
1090 driver_unregister(&driver
->drv
);
1093 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
1095 /* --------------------------------------------------------------------------
1097 -------------------------------------------------------------------------- */
1098 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
1100 struct acpi_device
*device
= NULL
;
1104 * Fixed hardware devices do not appear in the namespace and do not
1105 * have handles, but we fabricate acpi_devices for them, so we have
1106 * to deal with them specially.
1112 status
= acpi_get_parent(handle
, &handle
);
1113 if (ACPI_FAILURE(status
))
1114 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
1115 } while (acpi_bus_get_device(handle
, &device
));
1120 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
1124 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1125 union acpi_object
*obj
;
1127 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
1128 if (ACPI_FAILURE(status
))
1131 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
1132 if (ACPI_SUCCESS(status
)) {
1133 obj
= buffer
.pointer
;
1134 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
1136 kfree(buffer
.pointer
);
1140 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
1142 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
1143 struct acpi_device_wakeup
*wakeup
)
1145 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1146 union acpi_object
*package
= NULL
;
1147 union acpi_object
*element
= NULL
;
1154 INIT_LIST_HEAD(&wakeup
->resources
);
1157 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
1158 if (ACPI_FAILURE(status
)) {
1159 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
1163 package
= (union acpi_object
*)buffer
.pointer
;
1165 if (!package
|| package
->package
.count
< 2)
1168 element
= &(package
->package
.elements
[0]);
1172 if (element
->type
== ACPI_TYPE_PACKAGE
) {
1173 if ((element
->package
.count
< 2) ||
1174 (element
->package
.elements
[0].type
!=
1175 ACPI_TYPE_LOCAL_REFERENCE
)
1176 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
1179 wakeup
->gpe_device
=
1180 element
->package
.elements
[0].reference
.handle
;
1181 wakeup
->gpe_number
=
1182 (u32
) element
->package
.elements
[1].integer
.value
;
1183 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
1184 wakeup
->gpe_device
= NULL
;
1185 wakeup
->gpe_number
= element
->integer
.value
;
1190 element
= &(package
->package
.elements
[1]);
1191 if (element
->type
!= ACPI_TYPE_INTEGER
)
1194 wakeup
->sleep_state
= element
->integer
.value
;
1196 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
1200 if (!list_empty(&wakeup
->resources
)) {
1203 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
1206 acpi_handle_warn(handle
, "Retrieving current states "
1207 "of wakeup power resources failed\n");
1208 acpi_power_resources_list_free(&wakeup
->resources
);
1211 if (sleep_state
< wakeup
->sleep_state
) {
1212 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
1213 "(S%d) by S%d from power resources\n",
1214 (int)wakeup
->sleep_state
, sleep_state
);
1215 wakeup
->sleep_state
= sleep_state
;
1218 acpi_setup_gpe_for_wake(handle
, wakeup
->gpe_device
, wakeup
->gpe_number
);
1221 kfree(buffer
.pointer
);
1225 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
1227 struct acpi_device_id button_device_ids
[] = {
1234 acpi_event_status event_status
;
1236 device
->wakeup
.flags
.notifier_present
= 0;
1238 /* Power button, Lid switch always enable wakeup */
1239 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1240 device
->wakeup
.flags
.run_wake
= 1;
1241 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1242 /* Do not use Lid/sleep button for S5 wakeup */
1243 if (device
->wakeup
.sleep_state
== ACPI_STATE_S5
)
1244 device
->wakeup
.sleep_state
= ACPI_STATE_S4
;
1246 device_set_wakeup_capable(&device
->dev
, true);
1250 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
1251 device
->wakeup
.gpe_number
,
1253 if (status
== AE_OK
)
1254 device
->wakeup
.flags
.run_wake
=
1255 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
1258 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1262 /* Presence of _PRW indicates wake capable */
1263 if (!acpi_has_method(device
->handle
, "_PRW"))
1266 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1269 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1273 device
->wakeup
.flags
.valid
= 1;
1274 device
->wakeup
.prepare_count
= 0;
1275 acpi_bus_set_run_wake_flags(device
);
1276 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1277 * system for the ACPI device with the _PRW object.
1278 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1279 * So it is necessary to call _DSW object first. Only when it is not
1280 * present will the _PSW object used.
1282 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1284 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1285 "error in _DSW or _PSW evaluation\n"));
1288 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1290 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1291 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1292 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1295 INIT_LIST_HEAD(&ps
->resources
);
1297 /* Evaluate "_PRx" to get referenced power resources */
1298 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1299 if (ACPI_SUCCESS(status
)) {
1300 union acpi_object
*package
= buffer
.pointer
;
1302 if (buffer
.length
&& package
1303 && package
->type
== ACPI_TYPE_PACKAGE
1304 && package
->package
.count
) {
1305 int err
= acpi_extract_power_resources(package
, 0,
1308 device
->power
.flags
.power_resources
= 1;
1310 ACPI_FREE(buffer
.pointer
);
1313 /* Evaluate "_PSx" to see if we can do explicit sets */
1315 if (acpi_has_method(device
->handle
, pathname
))
1316 ps
->flags
.explicit_set
= 1;
1319 * State is valid if there are means to put the device into it.
1320 * D3hot is only valid if _PR3 present.
1322 if (!list_empty(&ps
->resources
)
1323 || (ps
->flags
.explicit_set
&& state
< ACPI_STATE_D3_HOT
)) {
1324 ps
->flags
.valid
= 1;
1325 ps
->flags
.os_accessible
= 1;
1328 ps
->power
= -1; /* Unknown - driver assigned */
1329 ps
->latency
= -1; /* Unknown - driver assigned */
1332 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1336 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1337 if (!acpi_has_method(device
->handle
, "_PS0") &&
1338 !acpi_has_method(device
->handle
, "_PR0"))
1341 device
->flags
.power_manageable
= 1;
1344 * Power Management Flags
1346 if (acpi_has_method(device
->handle
, "_PSC"))
1347 device
->power
.flags
.explicit_get
= 1;
1348 if (acpi_has_method(device
->handle
, "_IRC"))
1349 device
->power
.flags
.inrush_current
= 1;
1352 * Enumerate supported power management states
1354 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1355 acpi_bus_init_power_state(device
, i
);
1357 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1359 /* Set defaults for D0 and D3 states (always valid) */
1360 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1361 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1362 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.valid
= 1;
1363 device
->power
.states
[ACPI_STATE_D3_COLD
].power
= 0;
1365 /* Set D3cold's explicit_set flag if _PS3 exists. */
1366 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1367 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1369 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1370 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1371 device
->power
.flags
.power_resources
)
1372 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1374 if (acpi_bus_init_power(device
)) {
1375 acpi_free_power_resources_lists(device
);
1376 device
->flags
.power_manageable
= 0;
1380 static void acpi_bus_get_flags(struct acpi_device
*device
)
1382 /* Presence of _STA indicates 'dynamic_status' */
1383 if (acpi_has_method(device
->handle
, "_STA"))
1384 device
->flags
.dynamic_status
= 1;
1386 /* Presence of _RMV indicates 'removable' */
1387 if (acpi_has_method(device
->handle
, "_RMV"))
1388 device
->flags
.removable
= 1;
1390 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1391 if (acpi_has_method(device
->handle
, "_EJD") ||
1392 acpi_has_method(device
->handle
, "_EJ0"))
1393 device
->flags
.ejectable
= 1;
1396 static void acpi_device_get_busid(struct acpi_device
*device
)
1398 char bus_id
[5] = { '?', 0 };
1399 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1405 * The device's Bus ID is simply the object name.
1406 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1408 if (ACPI_IS_ROOT_DEVICE(device
)) {
1409 strcpy(device
->pnp
.bus_id
, "ACPI");
1413 switch (device
->device_type
) {
1414 case ACPI_BUS_TYPE_POWER_BUTTON
:
1415 strcpy(device
->pnp
.bus_id
, "PWRF");
1417 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1418 strcpy(device
->pnp
.bus_id
, "SLPF");
1421 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1422 /* Clean up trailing underscores (if any) */
1423 for (i
= 3; i
> 1; i
--) {
1424 if (bus_id
[i
] == '_')
1429 strcpy(device
->pnp
.bus_id
, bus_id
);
1435 * acpi_ata_match - see if an acpi object is an ATA device
1437 * If an acpi object has one of the ACPI ATA methods defined,
1438 * then we can safely call it an ATA device.
1440 bool acpi_ata_match(acpi_handle handle
)
1442 return acpi_has_method(handle
, "_GTF") ||
1443 acpi_has_method(handle
, "_GTM") ||
1444 acpi_has_method(handle
, "_STM") ||
1445 acpi_has_method(handle
, "_SDD");
1449 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1451 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1452 * then we can safely call it an ejectable drive bay
1454 bool acpi_bay_match(acpi_handle handle
)
1456 acpi_handle phandle
;
1458 if (!acpi_has_method(handle
, "_EJ0"))
1460 if (acpi_ata_match(handle
))
1462 if (ACPI_FAILURE(acpi_get_parent(handle
, &phandle
)))
1465 return acpi_ata_match(phandle
);
1469 * acpi_dock_match - see if an acpi object has a _DCK method
1471 bool acpi_dock_match(acpi_handle handle
)
1473 return acpi_has_method(handle
, "_DCK");
1476 const char *acpi_device_hid(struct acpi_device
*device
)
1478 struct acpi_hardware_id
*hid
;
1480 if (list_empty(&device
->pnp
.ids
))
1483 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1486 EXPORT_SYMBOL(acpi_device_hid
);
1488 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1490 struct acpi_hardware_id
*id
;
1492 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1496 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1502 list_add_tail(&id
->list
, &pnp
->ids
);
1503 pnp
->type
.hardware_id
= 1;
1507 * Old IBM workstations have a DSDT bug wherein the SMBus object
1508 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1509 * prefix. Work around this.
1511 static bool acpi_ibm_smbus_match(acpi_handle handle
)
1513 char node_name
[ACPI_PATH_SEGMENT_LENGTH
];
1514 struct acpi_buffer path
= { sizeof(node_name
), node_name
};
1516 if (!dmi_name_in_vendors("IBM"))
1519 /* Look for SMBS object */
1520 if (ACPI_FAILURE(acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
)) ||
1521 strcmp("SMBS", path
.pointer
))
1524 /* Does it have the necessary (but misnamed) methods? */
1525 if (acpi_has_method(handle
, "SBI") &&
1526 acpi_has_method(handle
, "SBR") &&
1527 acpi_has_method(handle
, "SBW"))
1533 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
1537 struct acpi_device_info
*info
;
1538 struct acpi_pnp_device_id_list
*cid_list
;
1541 switch (device_type
) {
1542 case ACPI_BUS_TYPE_DEVICE
:
1543 if (handle
== ACPI_ROOT_OBJECT
) {
1544 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
1548 status
= acpi_get_object_info(handle
, &info
);
1549 if (ACPI_FAILURE(status
)) {
1550 pr_err(PREFIX
"%s: Error reading device info\n",
1555 if (info
->valid
& ACPI_VALID_HID
)
1556 acpi_add_id(pnp
, info
->hardware_id
.string
);
1557 if (info
->valid
& ACPI_VALID_CID
) {
1558 cid_list
= &info
->compatible_id_list
;
1559 for (i
= 0; i
< cid_list
->count
; i
++)
1560 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
1562 if (info
->valid
& ACPI_VALID_ADR
) {
1563 pnp
->bus_address
= info
->address
;
1564 pnp
->type
.bus_address
= 1;
1566 if (info
->valid
& ACPI_VALID_UID
)
1567 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
1573 * Some devices don't reliably have _HIDs & _CIDs, so add
1574 * synthetic HIDs to make sure drivers can find them.
1576 if (acpi_is_video_device(handle
))
1577 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
1578 else if (acpi_bay_match(handle
))
1579 acpi_add_id(pnp
, ACPI_BAY_HID
);
1580 else if (acpi_dock_match(handle
))
1581 acpi_add_id(pnp
, ACPI_DOCK_HID
);
1582 else if (acpi_ibm_smbus_match(handle
))
1583 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
1584 else if (list_empty(&pnp
->ids
) && handle
== ACPI_ROOT_OBJECT
) {
1585 acpi_add_id(pnp
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1586 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
1587 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
1591 case ACPI_BUS_TYPE_POWER
:
1592 acpi_add_id(pnp
, ACPI_POWER_HID
);
1594 case ACPI_BUS_TYPE_PROCESSOR
:
1595 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
1597 case ACPI_BUS_TYPE_THERMAL
:
1598 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
1600 case ACPI_BUS_TYPE_POWER_BUTTON
:
1601 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
1603 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1604 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
1609 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
1611 struct acpi_hardware_id
*id
, *tmp
;
1613 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
1617 kfree(pnp
->unique_id
);
1620 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
1621 int type
, unsigned long long sta
)
1623 INIT_LIST_HEAD(&device
->pnp
.ids
);
1624 device
->device_type
= type
;
1625 device
->handle
= handle
;
1626 device
->parent
= acpi_bus_get_parent(handle
);
1627 STRUCT_TO_INT(device
->status
) = sta
;
1628 acpi_device_get_busid(device
);
1629 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
1630 acpi_bus_get_flags(device
);
1631 device
->flags
.match_driver
= false;
1632 device_initialize(&device
->dev
);
1633 dev_set_uevent_suppress(&device
->dev
, true);
1636 void acpi_device_add_finalize(struct acpi_device
*device
)
1638 dev_set_uevent_suppress(&device
->dev
, false);
1639 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
1642 static int acpi_add_single_object(struct acpi_device
**child
,
1643 acpi_handle handle
, int type
,
1644 unsigned long long sta
)
1647 struct acpi_device
*device
;
1648 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1650 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1652 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1656 acpi_init_device_object(device
, handle
, type
, sta
);
1657 acpi_bus_get_power_flags(device
);
1658 acpi_bus_get_wakeup_device_flags(device
);
1660 result
= acpi_device_add(device
, acpi_device_release
);
1662 acpi_device_release(&device
->dev
);
1666 acpi_power_add_remove_device(device
, true);
1667 acpi_device_add_finalize(device
);
1668 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1669 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
1670 dev_name(&device
->dev
), (char *) buffer
.pointer
,
1671 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
1672 kfree(buffer
.pointer
);
1677 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1678 unsigned long long *sta
)
1681 acpi_object_type acpi_type
;
1683 status
= acpi_get_type(handle
, &acpi_type
);
1684 if (ACPI_FAILURE(status
))
1687 switch (acpi_type
) {
1688 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1689 case ACPI_TYPE_DEVICE
:
1690 *type
= ACPI_BUS_TYPE_DEVICE
;
1691 status
= acpi_bus_get_status_handle(handle
, sta
);
1692 if (ACPI_FAILURE(status
))
1695 case ACPI_TYPE_PROCESSOR
:
1696 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1697 status
= acpi_bus_get_status_handle(handle
, sta
);
1698 if (ACPI_FAILURE(status
))
1701 case ACPI_TYPE_THERMAL
:
1702 *type
= ACPI_BUS_TYPE_THERMAL
;
1703 *sta
= ACPI_STA_DEFAULT
;
1705 case ACPI_TYPE_POWER
:
1706 *type
= ACPI_BUS_TYPE_POWER
;
1707 *sta
= ACPI_STA_DEFAULT
;
1716 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
1718 const struct acpi_device_id
**matchid
)
1720 const struct acpi_device_id
*devid
;
1722 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
1723 if (!strcmp((char *)devid
->id
, idstr
)) {
1733 static struct acpi_scan_handler
*acpi_scan_match_handler(char *idstr
,
1734 const struct acpi_device_id
**matchid
)
1736 struct acpi_scan_handler
*handler
;
1738 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
1739 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
1745 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
1747 if (!!hotplug
->enabled
== !!val
)
1750 mutex_lock(&acpi_scan_lock
);
1752 hotplug
->enabled
= val
;
1754 mutex_unlock(&acpi_scan_lock
);
1757 static void acpi_scan_init_hotplug(acpi_handle handle
, int type
)
1759 struct acpi_device_pnp pnp
= {};
1760 struct acpi_hardware_id
*hwid
;
1761 struct acpi_scan_handler
*handler
;
1763 INIT_LIST_HEAD(&pnp
.ids
);
1764 acpi_set_pnp_ids(handle
, &pnp
, type
);
1766 if (!pnp
.type
.hardware_id
)
1770 * This relies on the fact that acpi_install_notify_handler() will not
1771 * install the same notify handler routine twice for the same handle.
1773 list_for_each_entry(hwid
, &pnp
.ids
, list
) {
1774 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
1775 if (handler
&& !handler
->hotplug
.ignore
) {
1776 acpi_install_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
1777 acpi_hotplug_notify_cb
, handler
);
1783 acpi_free_pnp_ids(&pnp
);
1786 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
1787 void *not_used
, void **return_value
)
1789 struct acpi_device
*device
= NULL
;
1791 unsigned long long sta
;
1794 acpi_bus_get_device(handle
, &device
);
1798 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1802 if (type
== ACPI_BUS_TYPE_POWER
) {
1803 acpi_add_power_resource(handle
);
1807 acpi_scan_init_hotplug(handle
, type
);
1809 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1810 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
)) {
1811 struct acpi_device_wakeup wakeup
;
1813 if (acpi_has_method(handle
, "_PRW")) {
1814 acpi_bus_extract_wakeup_device_power_package(handle
,
1816 acpi_power_resources_list_free(&wakeup
.resources
);
1818 return AE_CTRL_DEPTH
;
1821 acpi_add_single_object(&device
, handle
, type
, sta
);
1823 return AE_CTRL_DEPTH
;
1827 *return_value
= device
;
1832 static int acpi_scan_attach_handler(struct acpi_device
*device
)
1834 struct acpi_hardware_id
*hwid
;
1837 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1838 const struct acpi_device_id
*devid
;
1839 struct acpi_scan_handler
*handler
;
1841 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
1843 ret
= handler
->attach(device
, devid
);
1845 device
->handler
= handler
;
1847 } else if (ret
< 0) {
1855 static acpi_status
acpi_bus_device_attach(acpi_handle handle
, u32 lvl_not_used
,
1856 void *not_used
, void **ret_not_used
)
1858 struct acpi_device
*device
;
1859 unsigned long long sta_not_used
;
1863 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1864 * namespace walks prematurely.
1866 if (acpi_bus_type_and_status(handle
, &ret
, &sta_not_used
))
1869 if (acpi_bus_get_device(handle
, &device
))
1870 return AE_CTRL_DEPTH
;
1872 if (device
->handler
)
1875 ret
= acpi_scan_attach_handler(device
);
1877 return AE_CTRL_DEPTH
;
1879 device
->flags
.match_driver
= true;
1883 ret
= device_attach(&device
->dev
);
1884 return ret
>= 0 ? AE_OK
: AE_CTRL_DEPTH
;
1888 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1889 * @handle: Root of the namespace scope to scan.
1891 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1894 * If no devices were found, -ENODEV is returned, but it does not mean that
1895 * there has been a real error. There just have been no suitable ACPI objects
1896 * in the table trunk from which the kernel could create a device and add an
1897 * appropriate driver.
1899 * Must be called under acpi_scan_lock.
1901 int acpi_bus_scan(acpi_handle handle
)
1903 void *device
= NULL
;
1906 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
1907 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1908 acpi_bus_check_add
, NULL
, NULL
, &device
);
1912 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle
, 0, NULL
, NULL
)))
1913 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1914 acpi_bus_device_attach
, NULL
, NULL
, NULL
);
1918 EXPORT_SYMBOL(acpi_bus_scan
);
1920 static acpi_status
acpi_bus_device_detach(acpi_handle handle
, u32 lvl_not_used
,
1921 void *not_used
, void **ret_not_used
)
1923 struct acpi_device
*device
= NULL
;
1925 if (!acpi_bus_get_device(handle
, &device
)) {
1926 struct acpi_scan_handler
*dev_handler
= device
->handler
;
1929 if (dev_handler
->detach
)
1930 dev_handler
->detach(device
);
1932 device
->handler
= NULL
;
1934 device_release_driver(&device
->dev
);
1940 static acpi_status
acpi_bus_remove(acpi_handle handle
, u32 lvl_not_used
,
1941 void *not_used
, void **ret_not_used
)
1943 struct acpi_device
*device
= NULL
;
1945 if (!acpi_bus_get_device(handle
, &device
))
1946 acpi_device_unregister(device
);
1952 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1953 * @start: Root of the ACPI device nodes subtree to remove.
1955 * Must be called under acpi_scan_lock.
1957 void acpi_bus_trim(struct acpi_device
*start
)
1960 * Execute acpi_bus_device_detach() as a post-order callback to detach
1961 * all ACPI drivers from the device nodes being removed.
1963 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
1964 acpi_bus_device_detach
, NULL
, NULL
);
1965 acpi_bus_device_detach(start
->handle
, 0, NULL
, NULL
);
1967 * Execute acpi_bus_remove() as a post-order callback to remove device
1968 * nodes in the given namespace scope.
1970 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
1971 acpi_bus_remove
, NULL
, NULL
);
1972 acpi_bus_remove(start
->handle
, 0, NULL
, NULL
);
1974 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1976 static int acpi_bus_scan_fixed(void)
1981 * Enumerate all fixed-feature devices.
1983 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
1984 struct acpi_device
*device
= NULL
;
1986 result
= acpi_add_single_object(&device
, NULL
,
1987 ACPI_BUS_TYPE_POWER_BUTTON
,
1992 device
->flags
.match_driver
= true;
1993 result
= device_attach(&device
->dev
);
1997 device_init_wakeup(&device
->dev
, true);
2000 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
2001 struct acpi_device
*device
= NULL
;
2003 result
= acpi_add_single_object(&device
, NULL
,
2004 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2009 device
->flags
.match_driver
= true;
2010 result
= device_attach(&device
->dev
);
2013 return result
< 0 ? result
: 0;
2016 int __init
acpi_scan_init(void)
2020 result
= bus_register(&acpi_bus_type
);
2022 /* We don't want to quit even if we failed to add suspend/resume */
2023 printk(KERN_ERR PREFIX
"Could not register bus type\n");
2026 acpi_pci_root_init();
2027 acpi_pci_link_init();
2028 acpi_processor_init();
2029 acpi_platform_init();
2031 acpi_cmos_rtc_init();
2032 acpi_container_init();
2033 acpi_memory_hotplug_init();
2036 mutex_lock(&acpi_scan_lock
);
2038 * Enumerate devices in the ACPI namespace.
2040 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2044 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2048 result
= acpi_bus_scan_fixed();
2050 acpi_device_unregister(acpi_root
);
2054 acpi_update_all_gpes();
2056 acpi_pci_root_hp_init();
2059 mutex_unlock(&acpi_scan_lock
);