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_device_list
);
39 static LIST_HEAD(acpi_bus_id_list
);
40 static DEFINE_MUTEX(acpi_scan_lock
);
41 static LIST_HEAD(acpi_scan_handlers_list
);
42 DEFINE_MUTEX(acpi_device_lock
);
43 LIST_HEAD(acpi_wakeup_device_list
);
45 struct acpi_device_bus_id
{
47 unsigned int instance_no
;
48 struct list_head node
;
51 void acpi_scan_lock_acquire(void)
53 mutex_lock(&acpi_scan_lock
);
55 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire
);
57 void acpi_scan_lock_release(void)
59 mutex_unlock(&acpi_scan_lock
);
61 EXPORT_SYMBOL_GPL(acpi_scan_lock_release
);
63 int acpi_scan_add_handler(struct acpi_scan_handler
*handler
)
65 if (!handler
|| !handler
->attach
)
68 list_add_tail(&handler
->list_node
, &acpi_scan_handlers_list
);
72 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler
*handler
,
73 const char *hotplug_profile_name
)
77 error
= acpi_scan_add_handler(handler
);
81 acpi_sysfs_add_hotplug_profile(&handler
->hotplug
, hotplug_profile_name
);
86 * Creates hid/cid(s) string needed for modalias and uevent
87 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
88 * char *modalias: "acpi:IBM0001:ACPI0001"
90 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
95 struct acpi_hardware_id
*id
;
97 if (list_empty(&acpi_dev
->pnp
.ids
))
100 len
= snprintf(modalias
, size
, "acpi:");
103 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
104 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
105 if (count
< 0 || count
>= size
)
111 modalias
[len
] = '\0';
116 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
117 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
120 /* Device has no HID and no CID or string is >1024 */
121 len
= create_modalias(acpi_dev
, buf
, 1024);
127 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
129 static acpi_status
acpi_bus_offline_companions(acpi_handle handle
, u32 lvl
,
130 void *data
, void **ret_p
)
132 struct acpi_device
*device
= NULL
;
133 struct acpi_device_physical_node
*pn
;
134 bool second_pass
= (bool)data
;
135 acpi_status status
= AE_OK
;
137 if (acpi_bus_get_device(handle
, &device
))
140 mutex_lock(&device
->physical_node_lock
);
142 list_for_each_entry(pn
, &device
->physical_node_list
, node
) {
146 /* Skip devices offlined by the first pass. */
150 pn
->put_online
= false;
152 ret
= device_offline(pn
->dev
);
153 if (acpi_force_hot_remove
)
157 pn
->put_online
= !ret
;
167 mutex_unlock(&device
->physical_node_lock
);
172 static acpi_status
acpi_bus_online_companions(acpi_handle handle
, u32 lvl
,
173 void *data
, void **ret_p
)
175 struct acpi_device
*device
= NULL
;
176 struct acpi_device_physical_node
*pn
;
178 if (acpi_bus_get_device(handle
, &device
))
181 mutex_lock(&device
->physical_node_lock
);
183 list_for_each_entry(pn
, &device
->physical_node_list
, node
)
184 if (pn
->put_online
) {
185 device_online(pn
->dev
);
186 pn
->put_online
= false;
189 mutex_unlock(&device
->physical_node_lock
);
194 static int acpi_scan_hot_remove(struct acpi_device
*device
)
196 acpi_handle handle
= device
->handle
;
197 acpi_handle not_used
;
198 struct acpi_object_list arg_list
;
199 union acpi_object arg
;
200 struct device
*errdev
;
202 unsigned long long sta
;
204 /* If there is no handle, the device node has been unregistered. */
206 dev_dbg(&device
->dev
, "ACPI handle missing\n");
207 put_device(&device
->dev
);
211 lock_device_hotplug();
214 * Carry out two passes here and ignore errors in the first pass,
215 * because if the devices in question are memory blocks and
216 * CONFIG_MEMCG is set, one of the blocks may hold data structures
217 * that the other blocks depend on, but it is not known in advance which
220 * If the first pass is successful, the second one isn't needed, though.
223 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
224 NULL
, acpi_bus_offline_companions
,
225 (void *)false, (void **)&errdev
);
226 acpi_bus_offline_companions(handle
, 0, (void *)false, (void **)&errdev
);
229 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
230 NULL
, acpi_bus_offline_companions
,
231 (void *)true , (void **)&errdev
);
232 if (!errdev
|| acpi_force_hot_remove
)
233 acpi_bus_offline_companions(handle
, 0, (void *)true,
236 if (errdev
&& !acpi_force_hot_remove
) {
237 dev_warn(errdev
, "Offline failed.\n");
238 acpi_bus_online_companions(handle
, 0, NULL
, NULL
);
239 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
,
241 acpi_bus_online_companions
, NULL
,
244 unlock_device_hotplug();
246 put_device(&device
->dev
);
251 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
252 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
254 acpi_bus_trim(device
);
256 unlock_device_hotplug();
258 /* Device node has been unregistered. */
259 put_device(&device
->dev
);
262 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_LCK", ¬_used
))) {
264 arg_list
.pointer
= &arg
;
265 arg
.type
= ACPI_TYPE_INTEGER
;
266 arg
.integer
.value
= 0;
267 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
271 arg_list
.pointer
= &arg
;
272 arg
.type
= ACPI_TYPE_INTEGER
;
273 arg
.integer
.value
= 1;
278 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
279 if (ACPI_FAILURE(status
)) {
280 if (status
== AE_NOT_FOUND
) {
283 acpi_handle_warn(handle
, "Eject failed (0x%x)\n",
290 * Verify if eject was indeed successful. If not, log an error
291 * message. No need to call _OST since _EJ0 call was made OK.
293 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
294 if (ACPI_FAILURE(status
)) {
295 acpi_handle_warn(handle
,
296 "Status check after eject failed (0x%x)\n", status
);
297 } else if (sta
& ACPI_STA_DEVICE_ENABLED
) {
298 acpi_handle_warn(handle
,
299 "Eject incomplete - status 0x%llx\n", sta
);
305 static void acpi_bus_device_eject(void *context
)
307 acpi_handle handle
= context
;
308 struct acpi_device
*device
= NULL
;
309 struct acpi_scan_handler
*handler
;
310 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
312 mutex_lock(&acpi_scan_lock
);
314 acpi_bus_get_device(handle
, &device
);
318 handler
= device
->handler
;
319 if (!handler
|| !handler
->hotplug
.enabled
) {
320 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
323 acpi_evaluate_hotplug_ost(handle
, ACPI_NOTIFY_EJECT_REQUEST
,
324 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
325 if (handler
->hotplug
.mode
== AHM_CONTAINER
) {
326 device
->flags
.eject_pending
= true;
327 kobject_uevent(&device
->dev
.kobj
, KOBJ_OFFLINE
);
331 get_device(&device
->dev
);
332 error
= acpi_scan_hot_remove(device
);
338 mutex_unlock(&acpi_scan_lock
);
342 acpi_evaluate_hotplug_ost(handle
, ACPI_NOTIFY_EJECT_REQUEST
, ost_code
,
347 static void acpi_scan_bus_device_check(acpi_handle handle
, u32 ost_source
)
349 struct acpi_device
*device
= NULL
;
350 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
353 mutex_lock(&acpi_scan_lock
);
354 lock_device_hotplug();
356 acpi_bus_get_device(handle
, &device
);
358 dev_warn(&device
->dev
, "Attempt to re-insert\n");
361 acpi_evaluate_hotplug_ost(handle
, ost_source
,
362 ACPI_OST_SC_INSERT_IN_PROGRESS
, NULL
);
363 error
= acpi_bus_scan(handle
);
365 acpi_handle_warn(handle
, "Namespace scan failure\n");
368 error
= acpi_bus_get_device(handle
, &device
);
370 acpi_handle_warn(handle
, "Missing device node object\n");
373 ost_code
= ACPI_OST_SC_SUCCESS
;
374 if (device
->handler
&& device
->handler
->hotplug
.mode
== AHM_CONTAINER
)
375 kobject_uevent(&device
->dev
.kobj
, KOBJ_ONLINE
);
378 unlock_device_hotplug();
379 acpi_evaluate_hotplug_ost(handle
, ost_source
, ost_code
, NULL
);
380 mutex_unlock(&acpi_scan_lock
);
383 static void acpi_scan_bus_check(void *context
)
385 acpi_scan_bus_device_check((acpi_handle
)context
,
386 ACPI_NOTIFY_BUS_CHECK
);
389 static void acpi_scan_device_check(void *context
)
391 acpi_scan_bus_device_check((acpi_handle
)context
,
392 ACPI_NOTIFY_DEVICE_CHECK
);
395 static void acpi_hotplug_unsupported(acpi_handle handle
, u32 type
)
400 case ACPI_NOTIFY_BUS_CHECK
:
401 acpi_handle_debug(handle
,
402 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
403 ost_status
= ACPI_OST_SC_INSERT_NOT_SUPPORTED
;
405 case ACPI_NOTIFY_DEVICE_CHECK
:
406 acpi_handle_debug(handle
,
407 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
408 ost_status
= ACPI_OST_SC_INSERT_NOT_SUPPORTED
;
410 case ACPI_NOTIFY_EJECT_REQUEST
:
411 acpi_handle_debug(handle
,
412 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
413 ost_status
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
416 /* non-hotplug event; possibly handled by other handler */
420 acpi_evaluate_hotplug_ost(handle
, type
, ost_status
, NULL
);
423 static void acpi_hotplug_notify_cb(acpi_handle handle
, u32 type
, void *data
)
425 acpi_osd_exec_callback callback
;
426 struct acpi_scan_handler
*handler
= data
;
429 if (!handler
->hotplug
.enabled
)
430 return acpi_hotplug_unsupported(handle
, type
);
433 case ACPI_NOTIFY_BUS_CHECK
:
434 acpi_handle_debug(handle
, "ACPI_NOTIFY_BUS_CHECK event\n");
435 callback
= acpi_scan_bus_check
;
437 case ACPI_NOTIFY_DEVICE_CHECK
:
438 acpi_handle_debug(handle
, "ACPI_NOTIFY_DEVICE_CHECK event\n");
439 callback
= acpi_scan_device_check
;
441 case ACPI_NOTIFY_EJECT_REQUEST
:
442 acpi_handle_debug(handle
, "ACPI_NOTIFY_EJECT_REQUEST event\n");
443 callback
= acpi_bus_device_eject
;
446 /* non-hotplug event; possibly handled by other handler */
449 status
= acpi_os_hotplug_execute(callback
, handle
);
450 if (ACPI_FAILURE(status
))
451 acpi_evaluate_hotplug_ost(handle
, type
,
452 ACPI_OST_SC_NON_SPECIFIC_FAILURE
,
457 * acpi_bus_hot_remove_device: hot-remove a device and its children
458 * @context: struct acpi_eject_event pointer (freed in this func)
460 * Hot-remove a device and its children. This function frees up the
461 * memory space passed by arg context, so that the caller may call
462 * this function asynchronously through acpi_os_hotplug_execute().
464 void acpi_bus_hot_remove_device(void *context
)
466 struct acpi_eject_event
*ej_event
= context
;
467 struct acpi_device
*device
= ej_event
->device
;
468 acpi_handle handle
= device
->handle
;
471 mutex_lock(&acpi_scan_lock
);
473 error
= acpi_scan_hot_remove(device
);
475 acpi_evaluate_hotplug_ost(handle
, ej_event
->event
,
476 ACPI_OST_SC_NON_SPECIFIC_FAILURE
,
479 mutex_unlock(&acpi_scan_lock
);
482 EXPORT_SYMBOL(acpi_bus_hot_remove_device
);
484 static ssize_t
real_power_state_show(struct device
*dev
,
485 struct device_attribute
*attr
, char *buf
)
487 struct acpi_device
*adev
= to_acpi_device(dev
);
491 ret
= acpi_device_get_power(adev
, &state
);
495 return sprintf(buf
, "%s\n", acpi_power_state_string(state
));
498 static DEVICE_ATTR(real_power_state
, 0444, real_power_state_show
, NULL
);
500 static ssize_t
power_state_show(struct device
*dev
,
501 struct device_attribute
*attr
, char *buf
)
503 struct acpi_device
*adev
= to_acpi_device(dev
);
505 return sprintf(buf
, "%s\n", acpi_power_state_string(adev
->power
.state
));
508 static DEVICE_ATTR(power_state
, 0444, power_state_show
, NULL
);
511 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
512 const char *buf
, size_t count
)
514 struct acpi_device
*acpi_device
= to_acpi_device(d
);
515 struct acpi_eject_event
*ej_event
;
516 acpi_object_type not_used
;
521 if (!count
|| buf
[0] != '1')
524 if ((!acpi_device
->handler
|| !acpi_device
->handler
->hotplug
.enabled
)
525 && !acpi_device
->driver
)
528 status
= acpi_get_type(acpi_device
->handle
, ¬_used
);
529 if (ACPI_FAILURE(status
) || !acpi_device
->flags
.ejectable
)
532 mutex_lock(&acpi_scan_lock
);
534 if (acpi_device
->flags
.eject_pending
) {
535 /* ACPI eject notification event. */
536 ost_source
= ACPI_NOTIFY_EJECT_REQUEST
;
537 acpi_device
->flags
.eject_pending
= 0;
539 /* Eject initiated by user space. */
540 ost_source
= ACPI_OST_EC_OSPM_EJECT
;
542 ej_event
= kmalloc(sizeof(*ej_event
), GFP_KERNEL
);
547 acpi_evaluate_hotplug_ost(acpi_device
->handle
, ost_source
,
548 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
549 ej_event
->device
= acpi_device
;
550 ej_event
->event
= ost_source
;
551 get_device(&acpi_device
->dev
);
552 status
= acpi_os_hotplug_execute(acpi_bus_hot_remove_device
, ej_event
);
553 if (ACPI_FAILURE(status
)) {
554 put_device(&acpi_device
->dev
);
556 ret
= status
== AE_NO_MEMORY
? -ENOMEM
: -EAGAIN
;
562 mutex_unlock(&acpi_scan_lock
);
566 acpi_evaluate_hotplug_ost(acpi_device
->handle
, ost_source
,
567 ACPI_OST_SC_NON_SPECIFIC_FAILURE
, NULL
);
571 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
574 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
575 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
577 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
579 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
581 static ssize_t
acpi_device_uid_show(struct device
*dev
,
582 struct device_attribute
*attr
, char *buf
)
584 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
586 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
588 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
590 static ssize_t
acpi_device_adr_show(struct device
*dev
,
591 struct device_attribute
*attr
, char *buf
)
593 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
595 return sprintf(buf
, "0x%08x\n",
596 (unsigned int)(acpi_dev
->pnp
.bus_address
));
598 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
601 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
602 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
603 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
606 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
610 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
615 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
617 /* sysfs file that shows description text from the ACPI _STR method */
618 static ssize_t
description_show(struct device
*dev
,
619 struct device_attribute
*attr
,
621 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
624 if (acpi_dev
->pnp
.str_obj
== NULL
)
628 * The _STR object contains a Unicode identifier for a device.
629 * We need to convert to utf-8 so it can be displayed.
631 result
= utf16s_to_utf8s(
632 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
633 acpi_dev
->pnp
.str_obj
->buffer
.length
,
634 UTF16_LITTLE_ENDIAN
, buf
,
637 buf
[result
++] = '\n';
641 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
644 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
646 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
648 return sprintf(buf
, "%lu\n", acpi_dev
->pnp
.sun
);
650 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
652 static int acpi_device_setup_files(struct acpi_device
*dev
)
654 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
657 unsigned long long sun
;
661 * Devices gotten from FADT don't have a "path" attribute
664 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
669 if (!list_empty(&dev
->pnp
.ids
)) {
670 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
674 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
680 * If device has _STR, 'description' file is created
682 status
= acpi_get_handle(dev
->handle
, "_STR", &temp
);
683 if (ACPI_SUCCESS(status
)) {
684 status
= acpi_evaluate_object(dev
->handle
, "_STR",
686 if (ACPI_FAILURE(status
))
687 buffer
.pointer
= NULL
;
688 dev
->pnp
.str_obj
= buffer
.pointer
;
689 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
694 if (dev
->pnp
.type
.bus_address
)
695 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
696 if (dev
->pnp
.unique_id
)
697 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
699 status
= acpi_evaluate_integer(dev
->handle
, "_SUN", NULL
, &sun
);
700 if (ACPI_SUCCESS(status
)) {
701 dev
->pnp
.sun
= (unsigned long)sun
;
702 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
706 dev
->pnp
.sun
= (unsigned long)-1;
710 * If device has _EJ0, 'eject' file is created that is used to trigger
711 * hot-removal function from userland.
713 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
714 if (ACPI_SUCCESS(status
)) {
715 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
720 if (dev
->flags
.power_manageable
) {
721 result
= device_create_file(&dev
->dev
, &dev_attr_power_state
);
725 if (dev
->power
.flags
.power_resources
)
726 result
= device_create_file(&dev
->dev
,
727 &dev_attr_real_power_state
);
734 static void acpi_device_remove_files(struct acpi_device
*dev
)
739 if (dev
->flags
.power_manageable
) {
740 device_remove_file(&dev
->dev
, &dev_attr_power_state
);
741 if (dev
->power
.flags
.power_resources
)
742 device_remove_file(&dev
->dev
,
743 &dev_attr_real_power_state
);
747 * If device has _STR, remove 'description' file
749 status
= acpi_get_handle(dev
->handle
, "_STR", &temp
);
750 if (ACPI_SUCCESS(status
)) {
751 kfree(dev
->pnp
.str_obj
);
752 device_remove_file(&dev
->dev
, &dev_attr_description
);
755 * If device has _EJ0, remove 'eject' file.
757 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
758 if (ACPI_SUCCESS(status
))
759 device_remove_file(&dev
->dev
, &dev_attr_eject
);
761 status
= acpi_get_handle(dev
->handle
, "_SUN", &temp
);
762 if (ACPI_SUCCESS(status
))
763 device_remove_file(&dev
->dev
, &dev_attr_sun
);
765 if (dev
->pnp
.unique_id
)
766 device_remove_file(&dev
->dev
, &dev_attr_uid
);
767 if (dev
->pnp
.type
.bus_address
)
768 device_remove_file(&dev
->dev
, &dev_attr_adr
);
769 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
770 device_remove_file(&dev
->dev
, &dev_attr_hid
);
772 device_remove_file(&dev
->dev
, &dev_attr_path
);
774 /* --------------------------------------------------------------------------
776 -------------------------------------------------------------------------- */
778 static const struct acpi_device_id
*__acpi_match_device(
779 struct acpi_device
*device
, const struct acpi_device_id
*ids
)
781 const struct acpi_device_id
*id
;
782 struct acpi_hardware_id
*hwid
;
785 * If the device is not present, it is unnecessary to load device
788 if (!device
->status
.present
)
791 for (id
= ids
; id
->id
[0]; id
++)
792 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
793 if (!strcmp((char *) id
->id
, hwid
->id
))
800 * acpi_match_device - Match a struct device against a given list of ACPI IDs
801 * @ids: Array of struct acpi_device_id object to match against.
802 * @dev: The device structure to match.
804 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
805 * object for that handle and use that object to match against a given list of
808 * Return a pointer to the first matching ID on success or %NULL on failure.
810 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
811 const struct device
*dev
)
813 struct acpi_device
*adev
;
814 acpi_handle handle
= ACPI_HANDLE(dev
);
816 if (!ids
|| !handle
|| acpi_bus_get_device(handle
, &adev
))
819 return __acpi_match_device(adev
, ids
);
821 EXPORT_SYMBOL_GPL(acpi_match_device
);
823 int acpi_match_device_ids(struct acpi_device
*device
,
824 const struct acpi_device_id
*ids
)
826 return __acpi_match_device(device
, ids
) ? 0 : -ENOENT
;
828 EXPORT_SYMBOL(acpi_match_device_ids
);
830 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
834 if (device
->wakeup
.flags
.valid
)
835 acpi_power_resources_list_free(&device
->wakeup
.resources
);
837 if (!device
->flags
.power_manageable
)
840 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
841 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
842 acpi_power_resources_list_free(&ps
->resources
);
846 static void acpi_device_release(struct device
*dev
)
848 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
850 acpi_free_pnp_ids(&acpi_dev
->pnp
);
851 acpi_free_power_resources_lists(acpi_dev
);
855 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
857 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
858 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
860 return acpi_dev
->flags
.match_driver
861 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
864 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
866 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
869 if (list_empty(&acpi_dev
->pnp
.ids
))
872 if (add_uevent_var(env
, "MODALIAS="))
874 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
875 sizeof(env
->buf
) - env
->buflen
);
876 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
882 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
884 struct acpi_device
*device
= data
;
886 device
->driver
->ops
.notify(device
, event
);
889 static acpi_status
acpi_device_notify_fixed(void *data
)
891 struct acpi_device
*device
= data
;
893 /* Fixed hardware devices have no handles */
894 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
898 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
902 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
904 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
905 acpi_device_notify_fixed
,
907 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
909 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
910 acpi_device_notify_fixed
,
913 status
= acpi_install_notify_handler(device
->handle
,
918 if (ACPI_FAILURE(status
))
923 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
925 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
926 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
927 acpi_device_notify_fixed
);
928 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
929 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
930 acpi_device_notify_fixed
);
932 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
936 static int acpi_device_probe(struct device
*dev
)
938 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
939 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
942 if (acpi_dev
->handler
)
945 if (!acpi_drv
->ops
.add
)
948 ret
= acpi_drv
->ops
.add(acpi_dev
);
952 acpi_dev
->driver
= acpi_drv
;
953 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
954 "Driver [%s] successfully bound to device [%s]\n",
955 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
957 if (acpi_drv
->ops
.notify
) {
958 ret
= acpi_device_install_notify_handler(acpi_dev
);
960 if (acpi_drv
->ops
.remove
)
961 acpi_drv
->ops
.remove(acpi_dev
);
963 acpi_dev
->driver
= NULL
;
964 acpi_dev
->driver_data
= NULL
;
969 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found driver [%s] for device [%s]\n",
970 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
975 static int acpi_device_remove(struct device
* dev
)
977 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
978 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
981 if (acpi_drv
->ops
.notify
)
982 acpi_device_remove_notify_handler(acpi_dev
);
983 if (acpi_drv
->ops
.remove
)
984 acpi_drv
->ops
.remove(acpi_dev
);
986 acpi_dev
->driver
= NULL
;
987 acpi_dev
->driver_data
= NULL
;
993 struct bus_type acpi_bus_type
= {
995 .match
= acpi_bus_match
,
996 .probe
= acpi_device_probe
,
997 .remove
= acpi_device_remove
,
998 .uevent
= acpi_device_uevent
,
1001 int acpi_device_add(struct acpi_device
*device
,
1002 void (*release
)(struct device
*))
1005 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
1008 if (device
->handle
) {
1011 status
= acpi_attach_data(device
->handle
, acpi_bus_data_handler
,
1013 if (ACPI_FAILURE(status
)) {
1014 acpi_handle_err(device
->handle
,
1015 "Unable to attach device data\n");
1023 * Link this device to its parent and siblings.
1025 INIT_LIST_HEAD(&device
->children
);
1026 INIT_LIST_HEAD(&device
->node
);
1027 INIT_LIST_HEAD(&device
->wakeup_list
);
1028 INIT_LIST_HEAD(&device
->physical_node_list
);
1029 mutex_init(&device
->physical_node_lock
);
1030 INIT_LIST_HEAD(&device
->power_dependent
);
1032 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
1034 pr_err(PREFIX
"Memory allocation error\n");
1039 mutex_lock(&acpi_device_lock
);
1041 * Find suitable bus_id and instance number in acpi_bus_id_list
1042 * If failed, create one and link it into acpi_bus_id_list
1044 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
1045 if (!strcmp(acpi_device_bus_id
->bus_id
,
1046 acpi_device_hid(device
))) {
1047 acpi_device_bus_id
->instance_no
++;
1054 acpi_device_bus_id
= new_bus_id
;
1055 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
1056 acpi_device_bus_id
->instance_no
= 0;
1057 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
1059 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
1062 list_add_tail(&device
->node
, &device
->parent
->children
);
1064 if (device
->wakeup
.flags
.valid
)
1065 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
1066 mutex_unlock(&acpi_device_lock
);
1069 device
->dev
.parent
= &device
->parent
->dev
;
1070 device
->dev
.bus
= &acpi_bus_type
;
1071 device
->dev
.release
= release
;
1072 result
= device_add(&device
->dev
);
1074 dev_err(&device
->dev
, "Error registering device\n");
1078 result
= acpi_device_setup_files(device
);
1080 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
1081 dev_name(&device
->dev
));
1086 mutex_lock(&acpi_device_lock
);
1088 list_del(&device
->node
);
1089 list_del(&device
->wakeup_list
);
1090 mutex_unlock(&acpi_device_lock
);
1093 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
1097 static void acpi_device_unregister(struct acpi_device
*device
)
1099 mutex_lock(&acpi_device_lock
);
1101 list_del(&device
->node
);
1103 list_del(&device
->wakeup_list
);
1104 mutex_unlock(&acpi_device_lock
);
1106 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
1108 acpi_power_add_remove_device(device
, false);
1109 acpi_device_remove_files(device
);
1111 device
->remove(device
);
1113 device_del(&device
->dev
);
1115 * Transition the device to D3cold to drop the reference counts of all
1116 * power resources the device depends on and turn off the ones that have
1117 * no more references.
1119 acpi_device_set_power(device
, ACPI_STATE_D3_COLD
);
1120 device
->handle
= NULL
;
1121 put_device(&device
->dev
);
1124 /* --------------------------------------------------------------------------
1126 -------------------------------------------------------------------------- */
1128 * acpi_bus_register_driver - register a driver with the ACPI bus
1129 * @driver: driver being registered
1131 * Registers a driver with the ACPI bus. Searches the namespace for all
1132 * devices that match the driver's criteria and binds. Returns zero for
1133 * success or a negative error status for failure.
1135 int acpi_bus_register_driver(struct acpi_driver
*driver
)
1141 driver
->drv
.name
= driver
->name
;
1142 driver
->drv
.bus
= &acpi_bus_type
;
1143 driver
->drv
.owner
= driver
->owner
;
1145 ret
= driver_register(&driver
->drv
);
1149 EXPORT_SYMBOL(acpi_bus_register_driver
);
1152 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1153 * @driver: driver to unregister
1155 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1156 * devices that match the driver's criteria and unbinds.
1158 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
1160 driver_unregister(&driver
->drv
);
1163 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
1165 /* --------------------------------------------------------------------------
1167 -------------------------------------------------------------------------- */
1168 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
1170 struct acpi_device
*device
= NULL
;
1174 * Fixed hardware devices do not appear in the namespace and do not
1175 * have handles, but we fabricate acpi_devices for them, so we have
1176 * to deal with them specially.
1182 status
= acpi_get_parent(handle
, &handle
);
1183 if (ACPI_FAILURE(status
))
1184 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
1185 } while (acpi_bus_get_device(handle
, &device
));
1190 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
1194 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1195 union acpi_object
*obj
;
1197 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
1198 if (ACPI_FAILURE(status
))
1201 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
1202 if (ACPI_SUCCESS(status
)) {
1203 obj
= buffer
.pointer
;
1204 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
1206 kfree(buffer
.pointer
);
1210 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
1212 void acpi_bus_data_handler(acpi_handle handle
, void *context
)
1220 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
1221 struct acpi_device_wakeup
*wakeup
)
1223 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1224 union acpi_object
*package
= NULL
;
1225 union acpi_object
*element
= NULL
;
1232 INIT_LIST_HEAD(&wakeup
->resources
);
1235 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
1236 if (ACPI_FAILURE(status
)) {
1237 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
1241 package
= (union acpi_object
*)buffer
.pointer
;
1243 if (!package
|| package
->package
.count
< 2)
1246 element
= &(package
->package
.elements
[0]);
1250 if (element
->type
== ACPI_TYPE_PACKAGE
) {
1251 if ((element
->package
.count
< 2) ||
1252 (element
->package
.elements
[0].type
!=
1253 ACPI_TYPE_LOCAL_REFERENCE
)
1254 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
1257 wakeup
->gpe_device
=
1258 element
->package
.elements
[0].reference
.handle
;
1259 wakeup
->gpe_number
=
1260 (u32
) element
->package
.elements
[1].integer
.value
;
1261 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
1262 wakeup
->gpe_device
= NULL
;
1263 wakeup
->gpe_number
= element
->integer
.value
;
1268 element
= &(package
->package
.elements
[1]);
1269 if (element
->type
!= ACPI_TYPE_INTEGER
)
1272 wakeup
->sleep_state
= element
->integer
.value
;
1274 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
1278 if (!list_empty(&wakeup
->resources
)) {
1281 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
1284 acpi_handle_warn(handle
, "Retrieving current states "
1285 "of wakeup power resources failed\n");
1286 acpi_power_resources_list_free(&wakeup
->resources
);
1289 if (sleep_state
< wakeup
->sleep_state
) {
1290 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
1291 "(S%d) by S%d from power resources\n",
1292 (int)wakeup
->sleep_state
, sleep_state
);
1293 wakeup
->sleep_state
= sleep_state
;
1296 acpi_setup_gpe_for_wake(handle
, wakeup
->gpe_device
, wakeup
->gpe_number
);
1299 kfree(buffer
.pointer
);
1303 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
1305 struct acpi_device_id button_device_ids
[] = {
1312 acpi_event_status event_status
;
1314 device
->wakeup
.flags
.notifier_present
= 0;
1316 /* Power button, Lid switch always enable wakeup */
1317 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1318 device
->wakeup
.flags
.run_wake
= 1;
1319 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1320 /* Do not use Lid/sleep button for S5 wakeup */
1321 if (device
->wakeup
.sleep_state
== ACPI_STATE_S5
)
1322 device
->wakeup
.sleep_state
= ACPI_STATE_S4
;
1324 device_set_wakeup_capable(&device
->dev
, true);
1328 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
1329 device
->wakeup
.gpe_number
,
1331 if (status
== AE_OK
)
1332 device
->wakeup
.flags
.run_wake
=
1333 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
1336 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1339 acpi_status status
= 0;
1342 /* Presence of _PRW indicates wake capable */
1343 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
1344 if (ACPI_FAILURE(status
))
1347 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1350 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1354 device
->wakeup
.flags
.valid
= 1;
1355 device
->wakeup
.prepare_count
= 0;
1356 acpi_bus_set_run_wake_flags(device
);
1357 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1358 * system for the ACPI device with the _PRW object.
1359 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1360 * So it is necessary to call _DSW object first. Only when it is not
1361 * present will the _PSW object used.
1363 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1365 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1366 "error in _DSW or _PSW evaluation\n"));
1369 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1371 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1372 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1373 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1377 INIT_LIST_HEAD(&ps
->resources
);
1379 /* Evaluate "_PRx" to get referenced power resources */
1380 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1381 if (ACPI_SUCCESS(status
)) {
1382 union acpi_object
*package
= buffer
.pointer
;
1384 if (buffer
.length
&& package
1385 && package
->type
== ACPI_TYPE_PACKAGE
1386 && package
->package
.count
) {
1387 int err
= acpi_extract_power_resources(package
, 0,
1390 device
->power
.flags
.power_resources
= 1;
1392 ACPI_FREE(buffer
.pointer
);
1395 /* Evaluate "_PSx" to see if we can do explicit sets */
1397 status
= acpi_get_handle(device
->handle
, pathname
, &handle
);
1398 if (ACPI_SUCCESS(status
))
1399 ps
->flags
.explicit_set
= 1;
1402 * State is valid if there are means to put the device into it.
1403 * D3hot is only valid if _PR3 present.
1405 if (!list_empty(&ps
->resources
)
1406 || (ps
->flags
.explicit_set
&& state
< ACPI_STATE_D3_HOT
)) {
1407 ps
->flags
.valid
= 1;
1408 ps
->flags
.os_accessible
= 1;
1411 ps
->power
= -1; /* Unknown - driver assigned */
1412 ps
->latency
= -1; /* Unknown - driver assigned */
1415 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1421 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1422 status
= acpi_get_handle(device
->handle
, "_PS0", &handle
);
1423 if (ACPI_FAILURE(status
)) {
1424 status
= acpi_get_handle(device
->handle
, "_PR0", &handle
);
1425 if (ACPI_FAILURE(status
))
1429 device
->flags
.power_manageable
= 1;
1432 * Power Management Flags
1434 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
1435 if (ACPI_SUCCESS(status
))
1436 device
->power
.flags
.explicit_get
= 1;
1437 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
1438 if (ACPI_SUCCESS(status
))
1439 device
->power
.flags
.inrush_current
= 1;
1442 * Enumerate supported power management states
1444 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1445 acpi_bus_init_power_state(device
, i
);
1447 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1449 /* Set defaults for D0 and D3 states (always valid) */
1450 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1451 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1452 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
1453 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
1455 /* Set D3cold's explicit_set flag if _PS3 exists. */
1456 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1457 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1459 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1460 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1461 device
->power
.flags
.power_resources
)
1462 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1464 if (acpi_bus_init_power(device
)) {
1465 acpi_free_power_resources_lists(device
);
1466 device
->flags
.power_manageable
= 0;
1470 static void acpi_bus_get_flags(struct acpi_device
*device
)
1472 acpi_status status
= AE_OK
;
1473 acpi_handle temp
= NULL
;
1475 /* Presence of _STA indicates 'dynamic_status' */
1476 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
1477 if (ACPI_SUCCESS(status
))
1478 device
->flags
.dynamic_status
= 1;
1480 /* Presence of _RMV indicates 'removable' */
1481 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
1482 if (ACPI_SUCCESS(status
))
1483 device
->flags
.removable
= 1;
1485 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1486 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
1487 if (ACPI_SUCCESS(status
))
1488 device
->flags
.ejectable
= 1;
1490 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
1491 if (ACPI_SUCCESS(status
))
1492 device
->flags
.ejectable
= 1;
1496 static void acpi_device_get_busid(struct acpi_device
*device
)
1498 char bus_id
[5] = { '?', 0 };
1499 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1505 * The device's Bus ID is simply the object name.
1506 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1508 if (ACPI_IS_ROOT_DEVICE(device
)) {
1509 strcpy(device
->pnp
.bus_id
, "ACPI");
1513 switch (device
->device_type
) {
1514 case ACPI_BUS_TYPE_POWER_BUTTON
:
1515 strcpy(device
->pnp
.bus_id
, "PWRF");
1517 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1518 strcpy(device
->pnp
.bus_id
, "SLPF");
1521 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1522 /* Clean up trailing underscores (if any) */
1523 for (i
= 3; i
> 1; i
--) {
1524 if (bus_id
[i
] == '_')
1529 strcpy(device
->pnp
.bus_id
, bus_id
);
1535 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1537 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1538 * then we can safely call it an ejectable drive bay
1540 static int acpi_bay_match(acpi_handle handle
)
1544 acpi_handle phandle
;
1546 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
1547 if (ACPI_FAILURE(status
))
1550 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
1551 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
1552 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
1553 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
1556 if (acpi_get_parent(handle
, &phandle
))
1559 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
1560 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
1561 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
1562 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
1569 * acpi_dock_match - see if an acpi object has a _DCK method
1571 static int acpi_dock_match(acpi_handle handle
)
1574 return acpi_get_handle(handle
, "_DCK", &tmp
);
1577 const char *acpi_device_hid(struct acpi_device
*device
)
1579 struct acpi_hardware_id
*hid
;
1581 if (list_empty(&device
->pnp
.ids
))
1584 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1587 EXPORT_SYMBOL(acpi_device_hid
);
1589 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1591 struct acpi_hardware_id
*id
;
1593 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1597 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1603 list_add_tail(&id
->list
, &pnp
->ids
);
1604 pnp
->type
.hardware_id
= 1;
1608 * Old IBM workstations have a DSDT bug wherein the SMBus object
1609 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1610 * prefix. Work around this.
1612 static int acpi_ibm_smbus_match(acpi_handle handle
)
1614 acpi_handle h_dummy
;
1615 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1618 if (!dmi_name_in_vendors("IBM"))
1621 /* Look for SMBS object */
1622 result
= acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
);
1626 if (strcmp("SMBS", path
.pointer
)) {
1631 /* Does it have the necessary (but misnamed) methods? */
1633 if (ACPI_SUCCESS(acpi_get_handle(handle
, "SBI", &h_dummy
)) &&
1634 ACPI_SUCCESS(acpi_get_handle(handle
, "SBR", &h_dummy
)) &&
1635 ACPI_SUCCESS(acpi_get_handle(handle
, "SBW", &h_dummy
)))
1638 kfree(path
.pointer
);
1642 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
1646 struct acpi_device_info
*info
;
1647 struct acpi_pnp_device_id_list
*cid_list
;
1650 switch (device_type
) {
1651 case ACPI_BUS_TYPE_DEVICE
:
1652 if (handle
== ACPI_ROOT_OBJECT
) {
1653 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
1657 status
= acpi_get_object_info(handle
, &info
);
1658 if (ACPI_FAILURE(status
)) {
1659 pr_err(PREFIX
"%s: Error reading device info\n",
1664 if (info
->valid
& ACPI_VALID_HID
)
1665 acpi_add_id(pnp
, info
->hardware_id
.string
);
1666 if (info
->valid
& ACPI_VALID_CID
) {
1667 cid_list
= &info
->compatible_id_list
;
1668 for (i
= 0; i
< cid_list
->count
; i
++)
1669 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
1671 if (info
->valid
& ACPI_VALID_ADR
) {
1672 pnp
->bus_address
= info
->address
;
1673 pnp
->type
.bus_address
= 1;
1675 if (info
->valid
& ACPI_VALID_UID
)
1676 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
1682 * Some devices don't reliably have _HIDs & _CIDs, so add
1683 * synthetic HIDs to make sure drivers can find them.
1685 if (acpi_is_video_device(handle
))
1686 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
1687 else if (ACPI_SUCCESS(acpi_bay_match(handle
)))
1688 acpi_add_id(pnp
, ACPI_BAY_HID
);
1689 else if (ACPI_SUCCESS(acpi_dock_match(handle
)))
1690 acpi_add_id(pnp
, ACPI_DOCK_HID
);
1691 else if (!acpi_ibm_smbus_match(handle
))
1692 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
1693 else if (list_empty(&pnp
->ids
) && handle
== ACPI_ROOT_OBJECT
) {
1694 acpi_add_id(pnp
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1695 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
1696 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
1700 case ACPI_BUS_TYPE_POWER
:
1701 acpi_add_id(pnp
, ACPI_POWER_HID
);
1703 case ACPI_BUS_TYPE_PROCESSOR
:
1704 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
1706 case ACPI_BUS_TYPE_THERMAL
:
1707 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
1709 case ACPI_BUS_TYPE_POWER_BUTTON
:
1710 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
1712 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1713 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
1718 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
1720 struct acpi_hardware_id
*id
, *tmp
;
1722 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
1726 kfree(pnp
->unique_id
);
1729 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
1730 int type
, unsigned long long sta
)
1732 INIT_LIST_HEAD(&device
->pnp
.ids
);
1733 device
->device_type
= type
;
1734 device
->handle
= handle
;
1735 device
->parent
= acpi_bus_get_parent(handle
);
1736 STRUCT_TO_INT(device
->status
) = sta
;
1737 acpi_device_get_busid(device
);
1738 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
1739 acpi_bus_get_flags(device
);
1740 device
->flags
.match_driver
= false;
1741 device_initialize(&device
->dev
);
1742 dev_set_uevent_suppress(&device
->dev
, true);
1745 void acpi_device_add_finalize(struct acpi_device
*device
)
1747 device
->flags
.match_driver
= true;
1748 dev_set_uevent_suppress(&device
->dev
, false);
1749 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
1752 static int acpi_add_single_object(struct acpi_device
**child
,
1753 acpi_handle handle
, int type
,
1754 unsigned long long sta
)
1757 struct acpi_device
*device
;
1758 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1760 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1762 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1766 acpi_init_device_object(device
, handle
, type
, sta
);
1767 acpi_bus_get_power_flags(device
);
1768 acpi_bus_get_wakeup_device_flags(device
);
1770 result
= acpi_device_add(device
, acpi_device_release
);
1772 acpi_device_release(&device
->dev
);
1776 acpi_power_add_remove_device(device
, true);
1777 acpi_device_add_finalize(device
);
1778 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1779 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
1780 dev_name(&device
->dev
), (char *) buffer
.pointer
,
1781 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
1782 kfree(buffer
.pointer
);
1787 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1788 unsigned long long *sta
)
1791 acpi_object_type acpi_type
;
1793 status
= acpi_get_type(handle
, &acpi_type
);
1794 if (ACPI_FAILURE(status
))
1797 switch (acpi_type
) {
1798 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1799 case ACPI_TYPE_DEVICE
:
1800 *type
= ACPI_BUS_TYPE_DEVICE
;
1801 status
= acpi_bus_get_status_handle(handle
, sta
);
1802 if (ACPI_FAILURE(status
))
1805 case ACPI_TYPE_PROCESSOR
:
1806 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1807 status
= acpi_bus_get_status_handle(handle
, sta
);
1808 if (ACPI_FAILURE(status
))
1811 case ACPI_TYPE_THERMAL
:
1812 *type
= ACPI_BUS_TYPE_THERMAL
;
1813 *sta
= ACPI_STA_DEFAULT
;
1815 case ACPI_TYPE_POWER
:
1816 *type
= ACPI_BUS_TYPE_POWER
;
1817 *sta
= ACPI_STA_DEFAULT
;
1826 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
1828 const struct acpi_device_id
**matchid
)
1830 const struct acpi_device_id
*devid
;
1832 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
1833 if (!strcmp((char *)devid
->id
, idstr
)) {
1843 static struct acpi_scan_handler
*acpi_scan_match_handler(char *idstr
,
1844 const struct acpi_device_id
**matchid
)
1846 struct acpi_scan_handler
*handler
;
1848 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
1849 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
1855 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
1857 if (!!hotplug
->enabled
== !!val
)
1860 mutex_lock(&acpi_scan_lock
);
1862 hotplug
->enabled
= val
;
1864 mutex_unlock(&acpi_scan_lock
);
1867 static void acpi_scan_init_hotplug(acpi_handle handle
, int type
)
1869 struct acpi_device_pnp pnp
= {};
1870 struct acpi_hardware_id
*hwid
;
1871 struct acpi_scan_handler
*handler
;
1873 INIT_LIST_HEAD(&pnp
.ids
);
1874 acpi_set_pnp_ids(handle
, &pnp
, type
);
1876 if (!pnp
.type
.hardware_id
)
1880 * This relies on the fact that acpi_install_notify_handler() will not
1881 * install the same notify handler routine twice for the same handle.
1883 list_for_each_entry(hwid
, &pnp
.ids
, list
) {
1884 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
1886 acpi_install_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
1887 acpi_hotplug_notify_cb
, handler
);
1893 acpi_free_pnp_ids(&pnp
);
1896 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
1897 void *not_used
, void **return_value
)
1899 struct acpi_device
*device
= NULL
;
1901 unsigned long long sta
;
1905 acpi_bus_get_device(handle
, &device
);
1909 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1913 if (type
== ACPI_BUS_TYPE_POWER
) {
1914 acpi_add_power_resource(handle
);
1918 acpi_scan_init_hotplug(handle
, type
);
1920 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1921 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
)) {
1922 struct acpi_device_wakeup wakeup
;
1925 status
= acpi_get_handle(handle
, "_PRW", &temp
);
1926 if (ACPI_SUCCESS(status
)) {
1927 acpi_bus_extract_wakeup_device_power_package(handle
,
1929 acpi_power_resources_list_free(&wakeup
.resources
);
1931 return AE_CTRL_DEPTH
;
1934 acpi_add_single_object(&device
, handle
, type
, sta
);
1936 return AE_CTRL_DEPTH
;
1940 *return_value
= device
;
1945 static int acpi_scan_attach_handler(struct acpi_device
*device
)
1947 struct acpi_hardware_id
*hwid
;
1950 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1951 const struct acpi_device_id
*devid
;
1952 struct acpi_scan_handler
*handler
;
1954 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
1956 ret
= handler
->attach(device
, devid
);
1958 device
->handler
= handler
;
1960 } else if (ret
< 0) {
1968 static acpi_status
acpi_bus_device_attach(acpi_handle handle
, u32 lvl_not_used
,
1969 void *not_used
, void **ret_not_used
)
1971 struct acpi_device
*device
;
1972 unsigned long long sta_not_used
;
1976 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1977 * namespace walks prematurely.
1979 if (acpi_bus_type_and_status(handle
, &ret
, &sta_not_used
))
1982 if (acpi_bus_get_device(handle
, &device
))
1983 return AE_CTRL_DEPTH
;
1985 ret
= acpi_scan_attach_handler(device
);
1987 return ret
> 0 ? AE_OK
: AE_CTRL_DEPTH
;
1989 ret
= device_attach(&device
->dev
);
1990 return ret
>= 0 ? AE_OK
: AE_CTRL_DEPTH
;
1994 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1995 * @handle: Root of the namespace scope to scan.
1997 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2000 * If no devices were found, -ENODEV is returned, but it does not mean that
2001 * there has been a real error. There just have been no suitable ACPI objects
2002 * in the table trunk from which the kernel could create a device and add an
2003 * appropriate driver.
2005 * Must be called under acpi_scan_lock.
2007 int acpi_bus_scan(acpi_handle handle
)
2009 void *device
= NULL
;
2012 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
2013 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
2014 acpi_bus_check_add
, NULL
, NULL
, &device
);
2018 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle
, 0, NULL
, NULL
)))
2019 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
2020 acpi_bus_device_attach
, NULL
, NULL
, NULL
);
2024 EXPORT_SYMBOL(acpi_bus_scan
);
2026 static acpi_status
acpi_bus_device_detach(acpi_handle handle
, u32 lvl_not_used
,
2027 void *not_used
, void **ret_not_used
)
2029 struct acpi_device
*device
= NULL
;
2031 if (!acpi_bus_get_device(handle
, &device
)) {
2032 struct acpi_scan_handler
*dev_handler
= device
->handler
;
2035 if (dev_handler
->detach
)
2036 dev_handler
->detach(device
);
2038 device
->handler
= NULL
;
2040 device_release_driver(&device
->dev
);
2046 static acpi_status
acpi_bus_remove(acpi_handle handle
, u32 lvl_not_used
,
2047 void *not_used
, void **ret_not_used
)
2049 struct acpi_device
*device
= NULL
;
2051 if (!acpi_bus_get_device(handle
, &device
))
2052 acpi_device_unregister(device
);
2058 * acpi_bus_trim - Remove ACPI device node and all of its descendants
2059 * @start: Root of the ACPI device nodes subtree to remove.
2061 * Must be called under acpi_scan_lock.
2063 void acpi_bus_trim(struct acpi_device
*start
)
2066 * Execute acpi_bus_device_detach() as a post-order callback to detach
2067 * all ACPI drivers from the device nodes being removed.
2069 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
2070 acpi_bus_device_detach
, NULL
, NULL
);
2071 acpi_bus_device_detach(start
->handle
, 0, NULL
, NULL
);
2073 * Execute acpi_bus_remove() as a post-order callback to remove device
2074 * nodes in the given namespace scope.
2076 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
2077 acpi_bus_remove
, NULL
, NULL
);
2078 acpi_bus_remove(start
->handle
, 0, NULL
, NULL
);
2080 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
2082 static int acpi_bus_scan_fixed(void)
2087 * Enumerate all fixed-feature devices.
2089 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
2090 struct acpi_device
*device
= NULL
;
2092 result
= acpi_add_single_object(&device
, NULL
,
2093 ACPI_BUS_TYPE_POWER_BUTTON
,
2098 result
= device_attach(&device
->dev
);
2102 device_init_wakeup(&device
->dev
, true);
2105 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
2106 struct acpi_device
*device
= NULL
;
2108 result
= acpi_add_single_object(&device
, NULL
,
2109 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2114 result
= device_attach(&device
->dev
);
2117 return result
< 0 ? result
: 0;
2120 int __init
acpi_scan_init(void)
2124 result
= bus_register(&acpi_bus_type
);
2126 /* We don't want to quit even if we failed to add suspend/resume */
2127 printk(KERN_ERR PREFIX
"Could not register bus type\n");
2130 acpi_pci_root_init();
2131 acpi_pci_link_init();
2132 acpi_processor_init();
2133 acpi_platform_init();
2135 acpi_cmos_rtc_init();
2136 acpi_container_init();
2137 acpi_memory_hotplug_init();
2140 mutex_lock(&acpi_scan_lock
);
2142 * Enumerate devices in the ACPI namespace.
2144 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2148 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2152 result
= acpi_bus_scan_fixed();
2154 acpi_device_unregister(acpi_root
);
2158 acpi_update_all_gpes();
2160 acpi_pci_root_hp_init();
2163 mutex_unlock(&acpi_scan_lock
);