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)
30 static const char *dummy_hid
= "device";
32 static LIST_HEAD(acpi_device_list
);
33 static LIST_HEAD(acpi_bus_id_list
);
34 static DEFINE_MUTEX(acpi_scan_lock
);
35 static LIST_HEAD(acpi_scan_handlers_list
);
36 DEFINE_MUTEX(acpi_device_lock
);
37 LIST_HEAD(acpi_wakeup_device_list
);
39 struct acpi_device_bus_id
{
41 unsigned int instance_no
;
42 struct list_head node
;
45 void acpi_scan_lock_acquire(void)
47 mutex_lock(&acpi_scan_lock
);
49 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire
);
51 void acpi_scan_lock_release(void)
53 mutex_unlock(&acpi_scan_lock
);
55 EXPORT_SYMBOL_GPL(acpi_scan_lock_release
);
57 int acpi_scan_add_handler(struct acpi_scan_handler
*handler
)
59 if (!handler
|| !handler
->attach
)
62 list_add_tail(&handler
->list_node
, &acpi_scan_handlers_list
);
66 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler
*handler
,
67 const char *hotplug_profile_name
)
71 error
= acpi_scan_add_handler(handler
);
75 acpi_sysfs_add_hotplug_profile(&handler
->hotplug
, hotplug_profile_name
);
80 * Creates hid/cid(s) string needed for modalias and uevent
81 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
82 * char *modalias: "acpi:IBM0001:ACPI0001"
84 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
89 struct acpi_hardware_id
*id
;
91 if (list_empty(&acpi_dev
->pnp
.ids
))
94 len
= snprintf(modalias
, size
, "acpi:");
97 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
98 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
99 if (count
< 0 || count
>= size
)
105 modalias
[len
] = '\0';
110 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
111 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
114 /* Device has no HID and no CID or string is >1024 */
115 len
= create_modalias(acpi_dev
, buf
, 1024);
121 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
123 static int acpi_scan_hot_remove(struct acpi_device
*device
)
125 acpi_handle handle
= device
->handle
;
126 acpi_handle not_used
;
127 struct acpi_object_list arg_list
;
128 union acpi_object arg
;
130 unsigned long long sta
;
132 /* If there is no handle, the device node has been unregistered. */
134 dev_dbg(&device
->dev
, "ACPI handle missing\n");
135 put_device(&device
->dev
);
139 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
140 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
142 acpi_bus_trim(device
);
143 /* Device node has been unregistered. */
144 put_device(&device
->dev
);
147 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_LCK", ¬_used
))) {
149 arg_list
.pointer
= &arg
;
150 arg
.type
= ACPI_TYPE_INTEGER
;
151 arg
.integer
.value
= 0;
152 acpi_evaluate_object(handle
, "_LCK", &arg_list
, NULL
);
156 arg_list
.pointer
= &arg
;
157 arg
.type
= ACPI_TYPE_INTEGER
;
158 arg
.integer
.value
= 1;
163 status
= acpi_evaluate_object(handle
, "_EJ0", &arg_list
, NULL
);
164 if (ACPI_FAILURE(status
)) {
165 if (status
== AE_NOT_FOUND
) {
168 acpi_handle_warn(handle
, "Eject failed (0x%x)\n",
175 * Verify if eject was indeed successful. If not, log an error
176 * message. No need to call _OST since _EJ0 call was made OK.
178 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
179 if (ACPI_FAILURE(status
)) {
180 acpi_handle_warn(handle
,
181 "Status check after eject failed (0x%x)\n", status
);
182 } else if (sta
& ACPI_STA_DEVICE_ENABLED
) {
183 acpi_handle_warn(handle
,
184 "Eject incomplete - status 0x%llx\n", sta
);
190 static void acpi_bus_device_eject(void *context
)
192 acpi_handle handle
= context
;
193 struct acpi_device
*device
= NULL
;
194 struct acpi_scan_handler
*handler
;
195 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
197 mutex_lock(&acpi_scan_lock
);
199 acpi_bus_get_device(handle
, &device
);
203 handler
= device
->handler
;
204 if (!handler
|| !handler
->hotplug
.enabled
) {
205 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
208 acpi_evaluate_hotplug_ost(handle
, ACPI_NOTIFY_EJECT_REQUEST
,
209 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
210 if (handler
->hotplug
.mode
== AHM_CONTAINER
) {
211 device
->flags
.eject_pending
= true;
212 kobject_uevent(&device
->dev
.kobj
, KOBJ_OFFLINE
);
216 get_device(&device
->dev
);
217 error
= acpi_scan_hot_remove(device
);
223 mutex_unlock(&acpi_scan_lock
);
227 acpi_evaluate_hotplug_ost(handle
, ACPI_NOTIFY_EJECT_REQUEST
, ost_code
,
232 static void acpi_scan_bus_device_check(acpi_handle handle
, u32 ost_source
)
234 struct acpi_device
*device
= NULL
;
235 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
238 mutex_lock(&acpi_scan_lock
);
240 acpi_bus_get_device(handle
, &device
);
242 dev_warn(&device
->dev
, "Attempt to re-insert\n");
245 acpi_evaluate_hotplug_ost(handle
, ost_source
,
246 ACPI_OST_SC_INSERT_IN_PROGRESS
, NULL
);
247 error
= acpi_bus_scan(handle
);
249 acpi_handle_warn(handle
, "Namespace scan failure\n");
252 error
= acpi_bus_get_device(handle
, &device
);
254 acpi_handle_warn(handle
, "Missing device node object\n");
257 ost_code
= ACPI_OST_SC_SUCCESS
;
258 if (device
->handler
&& device
->handler
->hotplug
.mode
== AHM_CONTAINER
)
259 kobject_uevent(&device
->dev
.kobj
, KOBJ_ONLINE
);
262 acpi_evaluate_hotplug_ost(handle
, ost_source
, ost_code
, NULL
);
263 mutex_unlock(&acpi_scan_lock
);
266 static void acpi_scan_bus_check(void *context
)
268 acpi_scan_bus_device_check((acpi_handle
)context
,
269 ACPI_NOTIFY_BUS_CHECK
);
272 static void acpi_scan_device_check(void *context
)
274 acpi_scan_bus_device_check((acpi_handle
)context
,
275 ACPI_NOTIFY_DEVICE_CHECK
);
278 static void acpi_hotplug_unsupported(acpi_handle handle
, u32 type
)
283 case ACPI_NOTIFY_BUS_CHECK
:
284 acpi_handle_debug(handle
,
285 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
286 ost_status
= ACPI_OST_SC_INSERT_NOT_SUPPORTED
;
288 case ACPI_NOTIFY_DEVICE_CHECK
:
289 acpi_handle_debug(handle
,
290 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
291 ost_status
= ACPI_OST_SC_INSERT_NOT_SUPPORTED
;
293 case ACPI_NOTIFY_EJECT_REQUEST
:
294 acpi_handle_debug(handle
,
295 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
296 ost_status
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
299 /* non-hotplug event; possibly handled by other handler */
303 acpi_evaluate_hotplug_ost(handle
, type
, ost_status
, NULL
);
306 static void acpi_hotplug_notify_cb(acpi_handle handle
, u32 type
, void *data
)
308 acpi_osd_exec_callback callback
;
309 struct acpi_scan_handler
*handler
= data
;
312 if (!handler
->hotplug
.enabled
)
313 return acpi_hotplug_unsupported(handle
, type
);
316 case ACPI_NOTIFY_BUS_CHECK
:
317 acpi_handle_debug(handle
, "ACPI_NOTIFY_BUS_CHECK event\n");
318 callback
= acpi_scan_bus_check
;
320 case ACPI_NOTIFY_DEVICE_CHECK
:
321 acpi_handle_debug(handle
, "ACPI_NOTIFY_DEVICE_CHECK event\n");
322 callback
= acpi_scan_device_check
;
324 case ACPI_NOTIFY_EJECT_REQUEST
:
325 acpi_handle_debug(handle
, "ACPI_NOTIFY_EJECT_REQUEST event\n");
326 callback
= acpi_bus_device_eject
;
329 /* non-hotplug event; possibly handled by other handler */
332 status
= acpi_os_hotplug_execute(callback
, handle
);
333 if (ACPI_FAILURE(status
))
334 acpi_evaluate_hotplug_ost(handle
, type
,
335 ACPI_OST_SC_NON_SPECIFIC_FAILURE
,
340 * acpi_bus_hot_remove_device: hot-remove a device and its children
341 * @context: struct acpi_eject_event pointer (freed in this func)
343 * Hot-remove a device and its children. This function frees up the
344 * memory space passed by arg context, so that the caller may call
345 * this function asynchronously through acpi_os_hotplug_execute().
347 void acpi_bus_hot_remove_device(void *context
)
349 struct acpi_eject_event
*ej_event
= context
;
350 struct acpi_device
*device
= ej_event
->device
;
351 acpi_handle handle
= device
->handle
;
354 mutex_lock(&acpi_scan_lock
);
356 error
= acpi_scan_hot_remove(device
);
358 acpi_evaluate_hotplug_ost(handle
, ej_event
->event
,
359 ACPI_OST_SC_NON_SPECIFIC_FAILURE
,
362 mutex_unlock(&acpi_scan_lock
);
365 EXPORT_SYMBOL(acpi_bus_hot_remove_device
);
367 static ssize_t
real_power_state_show(struct device
*dev
,
368 struct device_attribute
*attr
, char *buf
)
370 struct acpi_device
*adev
= to_acpi_device(dev
);
374 ret
= acpi_device_get_power(adev
, &state
);
378 return sprintf(buf
, "%s\n", acpi_power_state_string(state
));
381 static DEVICE_ATTR(real_power_state
, 0444, real_power_state_show
, NULL
);
383 static ssize_t
power_state_show(struct device
*dev
,
384 struct device_attribute
*attr
, char *buf
)
386 struct acpi_device
*adev
= to_acpi_device(dev
);
388 return sprintf(buf
, "%s\n", acpi_power_state_string(adev
->power
.state
));
391 static DEVICE_ATTR(power_state
, 0444, power_state_show
, NULL
);
394 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
395 const char *buf
, size_t count
)
397 struct acpi_device
*acpi_device
= to_acpi_device(d
);
398 struct acpi_eject_event
*ej_event
;
399 acpi_object_type not_used
;
404 if (!count
|| buf
[0] != '1')
407 if ((!acpi_device
->handler
|| !acpi_device
->handler
->hotplug
.enabled
)
408 && !acpi_device
->driver
)
411 status
= acpi_get_type(acpi_device
->handle
, ¬_used
);
412 if (ACPI_FAILURE(status
) || !acpi_device
->flags
.ejectable
)
415 mutex_lock(&acpi_scan_lock
);
417 if (acpi_device
->flags
.eject_pending
) {
418 /* ACPI eject notification event. */
419 ost_source
= ACPI_NOTIFY_EJECT_REQUEST
;
420 acpi_device
->flags
.eject_pending
= 0;
422 /* Eject initiated by user space. */
423 ost_source
= ACPI_OST_EC_OSPM_EJECT
;
425 ej_event
= kmalloc(sizeof(*ej_event
), GFP_KERNEL
);
430 acpi_evaluate_hotplug_ost(acpi_device
->handle
, ost_source
,
431 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
432 ej_event
->device
= acpi_device
;
433 ej_event
->event
= ost_source
;
434 get_device(&acpi_device
->dev
);
435 status
= acpi_os_hotplug_execute(acpi_bus_hot_remove_device
, ej_event
);
436 if (ACPI_FAILURE(status
)) {
437 put_device(&acpi_device
->dev
);
439 ret
= status
== AE_NO_MEMORY
? -ENOMEM
: -EAGAIN
;
445 mutex_unlock(&acpi_scan_lock
);
449 acpi_evaluate_hotplug_ost(acpi_device
->handle
, ost_source
,
450 ACPI_OST_SC_NON_SPECIFIC_FAILURE
, NULL
);
454 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
457 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
458 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
460 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
462 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
464 static ssize_t
acpi_device_uid_show(struct device
*dev
,
465 struct device_attribute
*attr
, char *buf
)
467 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
469 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
471 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
473 static ssize_t
acpi_device_adr_show(struct device
*dev
,
474 struct device_attribute
*attr
, char *buf
)
476 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
478 return sprintf(buf
, "0x%08x\n",
479 (unsigned int)(acpi_dev
->pnp
.bus_address
));
481 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
484 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
485 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
486 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
489 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
493 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
498 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
500 /* sysfs file that shows description text from the ACPI _STR method */
501 static ssize_t
description_show(struct device
*dev
,
502 struct device_attribute
*attr
,
504 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
507 if (acpi_dev
->pnp
.str_obj
== NULL
)
511 * The _STR object contains a Unicode identifier for a device.
512 * We need to convert to utf-8 so it can be displayed.
514 result
= utf16s_to_utf8s(
515 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
516 acpi_dev
->pnp
.str_obj
->buffer
.length
,
517 UTF16_LITTLE_ENDIAN
, buf
,
520 buf
[result
++] = '\n';
524 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
527 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
529 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
531 return sprintf(buf
, "%lu\n", acpi_dev
->pnp
.sun
);
533 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
535 static int acpi_device_setup_files(struct acpi_device
*dev
)
537 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
540 unsigned long long sun
;
544 * Devices gotten from FADT don't have a "path" attribute
547 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
552 if (!list_empty(&dev
->pnp
.ids
)) {
553 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
557 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
563 * If device has _STR, 'description' file is created
565 status
= acpi_get_handle(dev
->handle
, "_STR", &temp
);
566 if (ACPI_SUCCESS(status
)) {
567 status
= acpi_evaluate_object(dev
->handle
, "_STR",
569 if (ACPI_FAILURE(status
))
570 buffer
.pointer
= NULL
;
571 dev
->pnp
.str_obj
= buffer
.pointer
;
572 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
577 if (dev
->pnp
.type
.bus_address
)
578 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
579 if (dev
->pnp
.unique_id
)
580 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
582 status
= acpi_evaluate_integer(dev
->handle
, "_SUN", NULL
, &sun
);
583 if (ACPI_SUCCESS(status
)) {
584 dev
->pnp
.sun
= (unsigned long)sun
;
585 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
589 dev
->pnp
.sun
= (unsigned long)-1;
593 * If device has _EJ0, 'eject' file is created that is used to trigger
594 * hot-removal function from userland.
596 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
597 if (ACPI_SUCCESS(status
)) {
598 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
603 if (dev
->flags
.power_manageable
) {
604 result
= device_create_file(&dev
->dev
, &dev_attr_power_state
);
608 if (dev
->power
.flags
.power_resources
)
609 result
= device_create_file(&dev
->dev
,
610 &dev_attr_real_power_state
);
617 static void acpi_device_remove_files(struct acpi_device
*dev
)
622 if (dev
->flags
.power_manageable
) {
623 device_remove_file(&dev
->dev
, &dev_attr_power_state
);
624 if (dev
->power
.flags
.power_resources
)
625 device_remove_file(&dev
->dev
,
626 &dev_attr_real_power_state
);
630 * If device has _STR, remove 'description' file
632 status
= acpi_get_handle(dev
->handle
, "_STR", &temp
);
633 if (ACPI_SUCCESS(status
)) {
634 kfree(dev
->pnp
.str_obj
);
635 device_remove_file(&dev
->dev
, &dev_attr_description
);
638 * If device has _EJ0, remove 'eject' file.
640 status
= acpi_get_handle(dev
->handle
, "_EJ0", &temp
);
641 if (ACPI_SUCCESS(status
))
642 device_remove_file(&dev
->dev
, &dev_attr_eject
);
644 status
= acpi_get_handle(dev
->handle
, "_SUN", &temp
);
645 if (ACPI_SUCCESS(status
))
646 device_remove_file(&dev
->dev
, &dev_attr_sun
);
648 if (dev
->pnp
.unique_id
)
649 device_remove_file(&dev
->dev
, &dev_attr_uid
);
650 if (dev
->pnp
.type
.bus_address
)
651 device_remove_file(&dev
->dev
, &dev_attr_adr
);
652 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
653 device_remove_file(&dev
->dev
, &dev_attr_hid
);
655 device_remove_file(&dev
->dev
, &dev_attr_path
);
657 /* --------------------------------------------------------------------------
659 -------------------------------------------------------------------------- */
661 static const struct acpi_device_id
*__acpi_match_device(
662 struct acpi_device
*device
, const struct acpi_device_id
*ids
)
664 const struct acpi_device_id
*id
;
665 struct acpi_hardware_id
*hwid
;
668 * If the device is not present, it is unnecessary to load device
671 if (!device
->status
.present
)
674 for (id
= ids
; id
->id
[0]; id
++)
675 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
676 if (!strcmp((char *) id
->id
, hwid
->id
))
683 * acpi_match_device - Match a struct device against a given list of ACPI IDs
684 * @ids: Array of struct acpi_device_id object to match against.
685 * @dev: The device structure to match.
687 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
688 * object for that handle and use that object to match against a given list of
691 * Return a pointer to the first matching ID on success or %NULL on failure.
693 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
694 const struct device
*dev
)
696 struct acpi_device
*adev
;
697 acpi_handle handle
= ACPI_HANDLE(dev
);
699 if (!ids
|| !handle
|| acpi_bus_get_device(handle
, &adev
))
702 return __acpi_match_device(adev
, ids
);
704 EXPORT_SYMBOL_GPL(acpi_match_device
);
706 int acpi_match_device_ids(struct acpi_device
*device
,
707 const struct acpi_device_id
*ids
)
709 return __acpi_match_device(device
, ids
) ? 0 : -ENOENT
;
711 EXPORT_SYMBOL(acpi_match_device_ids
);
713 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
717 if (device
->wakeup
.flags
.valid
)
718 acpi_power_resources_list_free(&device
->wakeup
.resources
);
720 if (!device
->flags
.power_manageable
)
723 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
724 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
725 acpi_power_resources_list_free(&ps
->resources
);
729 static void acpi_device_release(struct device
*dev
)
731 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
733 acpi_free_pnp_ids(&acpi_dev
->pnp
);
734 acpi_free_power_resources_lists(acpi_dev
);
738 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
740 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
741 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
743 return acpi_dev
->flags
.match_driver
744 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
747 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
749 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
752 if (list_empty(&acpi_dev
->pnp
.ids
))
755 if (add_uevent_var(env
, "MODALIAS="))
757 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
758 sizeof(env
->buf
) - env
->buflen
);
759 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
765 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
767 struct acpi_device
*device
= data
;
769 device
->driver
->ops
.notify(device
, event
);
772 static acpi_status
acpi_device_notify_fixed(void *data
)
774 struct acpi_device
*device
= data
;
776 /* Fixed hardware devices have no handles */
777 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
781 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
785 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
787 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
788 acpi_device_notify_fixed
,
790 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
792 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
793 acpi_device_notify_fixed
,
796 status
= acpi_install_notify_handler(device
->handle
,
801 if (ACPI_FAILURE(status
))
806 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
808 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
809 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
810 acpi_device_notify_fixed
);
811 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
812 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
813 acpi_device_notify_fixed
);
815 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
819 static int acpi_bus_driver_init(struct acpi_device
*, struct acpi_driver
*);
820 static int acpi_device_probe(struct device
* dev
)
822 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
823 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
826 ret
= acpi_bus_driver_init(acpi_dev
, acpi_drv
);
828 if (acpi_drv
->ops
.notify
) {
829 ret
= acpi_device_install_notify_handler(acpi_dev
);
831 if (acpi_drv
->ops
.remove
)
832 acpi_drv
->ops
.remove(acpi_dev
);
833 acpi_dev
->driver
= NULL
;
834 acpi_dev
->driver_data
= NULL
;
839 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
840 "Found driver [%s] for device [%s]\n",
841 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
847 static int acpi_device_remove(struct device
* dev
)
849 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
850 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
853 if (acpi_drv
->ops
.notify
)
854 acpi_device_remove_notify_handler(acpi_dev
);
855 if (acpi_drv
->ops
.remove
)
856 acpi_drv
->ops
.remove(acpi_dev
);
858 acpi_dev
->driver
= NULL
;
859 acpi_dev
->driver_data
= NULL
;
865 struct bus_type acpi_bus_type
= {
867 .match
= acpi_bus_match
,
868 .probe
= acpi_device_probe
,
869 .remove
= acpi_device_remove
,
870 .uevent
= acpi_device_uevent
,
873 int acpi_device_add(struct acpi_device
*device
,
874 void (*release
)(struct device
*))
877 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
880 if (device
->handle
) {
883 status
= acpi_attach_data(device
->handle
, acpi_bus_data_handler
,
885 if (ACPI_FAILURE(status
)) {
886 acpi_handle_err(device
->handle
,
887 "Unable to attach device data\n");
895 * Link this device to its parent and siblings.
897 INIT_LIST_HEAD(&device
->children
);
898 INIT_LIST_HEAD(&device
->node
);
899 INIT_LIST_HEAD(&device
->wakeup_list
);
900 INIT_LIST_HEAD(&device
->physical_node_list
);
901 mutex_init(&device
->physical_node_lock
);
902 INIT_LIST_HEAD(&device
->power_dependent
);
904 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
906 pr_err(PREFIX
"Memory allocation error\n");
911 mutex_lock(&acpi_device_lock
);
913 * Find suitable bus_id and instance number in acpi_bus_id_list
914 * If failed, create one and link it into acpi_bus_id_list
916 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
917 if (!strcmp(acpi_device_bus_id
->bus_id
,
918 acpi_device_hid(device
))) {
919 acpi_device_bus_id
->instance_no
++;
926 acpi_device_bus_id
= new_bus_id
;
927 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
928 acpi_device_bus_id
->instance_no
= 0;
929 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
931 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
934 list_add_tail(&device
->node
, &device
->parent
->children
);
936 if (device
->wakeup
.flags
.valid
)
937 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
938 mutex_unlock(&acpi_device_lock
);
941 device
->dev
.parent
= &device
->parent
->dev
;
942 device
->dev
.bus
= &acpi_bus_type
;
943 device
->dev
.release
= release
;
944 result
= device_add(&device
->dev
);
946 dev_err(&device
->dev
, "Error registering device\n");
950 result
= acpi_device_setup_files(device
);
952 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
953 dev_name(&device
->dev
));
955 device
->removal_type
= ACPI_BUS_REMOVAL_NORMAL
;
959 mutex_lock(&acpi_device_lock
);
961 list_del(&device
->node
);
962 list_del(&device
->wakeup_list
);
963 mutex_unlock(&acpi_device_lock
);
966 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
970 static void acpi_device_unregister(struct acpi_device
*device
)
972 mutex_lock(&acpi_device_lock
);
974 list_del(&device
->node
);
976 list_del(&device
->wakeup_list
);
977 mutex_unlock(&acpi_device_lock
);
979 acpi_detach_data(device
->handle
, acpi_bus_data_handler
);
981 acpi_power_add_remove_device(device
, false);
982 acpi_device_remove_files(device
);
984 device
->remove(device
);
986 device_del(&device
->dev
);
988 * Transition the device to D3cold to drop the reference counts of all
989 * power resources the device depends on and turn off the ones that have
990 * no more references.
992 acpi_device_set_power(device
, ACPI_STATE_D3_COLD
);
993 device
->handle
= NULL
;
994 put_device(&device
->dev
);
997 /* --------------------------------------------------------------------------
999 -------------------------------------------------------------------------- */
1001 * acpi_bus_driver_init - add a device to a driver
1002 * @device: the device to add and initialize
1003 * @driver: driver for the device
1005 * Used to initialize a device via its device driver. Called whenever a
1006 * driver is bound to a device. Invokes the driver's add() ops.
1009 acpi_bus_driver_init(struct acpi_device
*device
, struct acpi_driver
*driver
)
1013 if (!device
|| !driver
)
1016 if (!driver
->ops
.add
)
1019 result
= driver
->ops
.add(device
);
1023 device
->driver
= driver
;
1026 * TBD - Configuration Management: Assign resources to device based
1027 * upon possible configuration and currently allocated resources.
1030 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1031 "Driver successfully bound to device\n"));
1036 * acpi_bus_register_driver - register a driver with the ACPI bus
1037 * @driver: driver being registered
1039 * Registers a driver with the ACPI bus. Searches the namespace for all
1040 * devices that match the driver's criteria and binds. Returns zero for
1041 * success or a negative error status for failure.
1043 int acpi_bus_register_driver(struct acpi_driver
*driver
)
1049 driver
->drv
.name
= driver
->name
;
1050 driver
->drv
.bus
= &acpi_bus_type
;
1051 driver
->drv
.owner
= driver
->owner
;
1053 ret
= driver_register(&driver
->drv
);
1057 EXPORT_SYMBOL(acpi_bus_register_driver
);
1060 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1061 * @driver: driver to unregister
1063 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1064 * devices that match the driver's criteria and unbinds.
1066 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
1068 driver_unregister(&driver
->drv
);
1071 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
1073 /* --------------------------------------------------------------------------
1075 -------------------------------------------------------------------------- */
1076 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
1078 struct acpi_device
*device
= NULL
;
1082 * Fixed hardware devices do not appear in the namespace and do not
1083 * have handles, but we fabricate acpi_devices for them, so we have
1084 * to deal with them specially.
1090 status
= acpi_get_parent(handle
, &handle
);
1091 if (ACPI_FAILURE(status
))
1092 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
1093 } while (acpi_bus_get_device(handle
, &device
));
1098 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
1102 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1103 union acpi_object
*obj
;
1105 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
1106 if (ACPI_FAILURE(status
))
1109 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
1110 if (ACPI_SUCCESS(status
)) {
1111 obj
= buffer
.pointer
;
1112 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
1114 kfree(buffer
.pointer
);
1118 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
1120 void acpi_bus_data_handler(acpi_handle handle
, void *context
)
1128 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
1129 struct acpi_device_wakeup
*wakeup
)
1131 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1132 union acpi_object
*package
= NULL
;
1133 union acpi_object
*element
= NULL
;
1140 INIT_LIST_HEAD(&wakeup
->resources
);
1143 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
1144 if (ACPI_FAILURE(status
)) {
1145 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
1149 package
= (union acpi_object
*)buffer
.pointer
;
1151 if (!package
|| package
->package
.count
< 2)
1154 element
= &(package
->package
.elements
[0]);
1158 if (element
->type
== ACPI_TYPE_PACKAGE
) {
1159 if ((element
->package
.count
< 2) ||
1160 (element
->package
.elements
[0].type
!=
1161 ACPI_TYPE_LOCAL_REFERENCE
)
1162 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
1165 wakeup
->gpe_device
=
1166 element
->package
.elements
[0].reference
.handle
;
1167 wakeup
->gpe_number
=
1168 (u32
) element
->package
.elements
[1].integer
.value
;
1169 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
1170 wakeup
->gpe_device
= NULL
;
1171 wakeup
->gpe_number
= element
->integer
.value
;
1176 element
= &(package
->package
.elements
[1]);
1177 if (element
->type
!= ACPI_TYPE_INTEGER
)
1180 wakeup
->sleep_state
= element
->integer
.value
;
1182 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
1186 if (!list_empty(&wakeup
->resources
)) {
1189 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
1192 acpi_handle_warn(handle
, "Retrieving current states "
1193 "of wakeup power resources failed\n");
1194 acpi_power_resources_list_free(&wakeup
->resources
);
1197 if (sleep_state
< wakeup
->sleep_state
) {
1198 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
1199 "(S%d) by S%d from power resources\n",
1200 (int)wakeup
->sleep_state
, sleep_state
);
1201 wakeup
->sleep_state
= sleep_state
;
1204 acpi_setup_gpe_for_wake(handle
, wakeup
->gpe_device
, wakeup
->gpe_number
);
1207 kfree(buffer
.pointer
);
1211 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
1213 struct acpi_device_id button_device_ids
[] = {
1220 acpi_event_status event_status
;
1222 device
->wakeup
.flags
.notifier_present
= 0;
1224 /* Power button, Lid switch always enable wakeup */
1225 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1226 device
->wakeup
.flags
.run_wake
= 1;
1227 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1228 /* Do not use Lid/sleep button for S5 wakeup */
1229 if (device
->wakeup
.sleep_state
== ACPI_STATE_S5
)
1230 device
->wakeup
.sleep_state
= ACPI_STATE_S4
;
1232 device_set_wakeup_capable(&device
->dev
, true);
1236 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
1237 device
->wakeup
.gpe_number
,
1239 if (status
== AE_OK
)
1240 device
->wakeup
.flags
.run_wake
=
1241 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
1244 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1247 acpi_status status
= 0;
1250 /* Presence of _PRW indicates wake capable */
1251 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
1252 if (ACPI_FAILURE(status
))
1255 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1258 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1262 device
->wakeup
.flags
.valid
= 1;
1263 device
->wakeup
.prepare_count
= 0;
1264 acpi_bus_set_run_wake_flags(device
);
1265 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1266 * system for the ACPI device with the _PRW object.
1267 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1268 * So it is necessary to call _DSW object first. Only when it is not
1269 * present will the _PSW object used.
1271 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1273 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1274 "error in _DSW or _PSW evaluation\n"));
1277 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1279 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1280 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1281 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1285 INIT_LIST_HEAD(&ps
->resources
);
1287 /* Evaluate "_PRx" to get referenced power resources */
1288 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1289 if (ACPI_SUCCESS(status
)) {
1290 union acpi_object
*package
= buffer
.pointer
;
1292 if (buffer
.length
&& package
1293 && package
->type
== ACPI_TYPE_PACKAGE
1294 && package
->package
.count
) {
1295 int err
= acpi_extract_power_resources(package
, 0,
1298 device
->power
.flags
.power_resources
= 1;
1300 ACPI_FREE(buffer
.pointer
);
1303 /* Evaluate "_PSx" to see if we can do explicit sets */
1305 status
= acpi_get_handle(device
->handle
, pathname
, &handle
);
1306 if (ACPI_SUCCESS(status
))
1307 ps
->flags
.explicit_set
= 1;
1310 * State is valid if there are means to put the device into it.
1311 * D3hot is only valid if _PR3 present.
1313 if (!list_empty(&ps
->resources
)
1314 || (ps
->flags
.explicit_set
&& state
< ACPI_STATE_D3_HOT
)) {
1315 ps
->flags
.valid
= 1;
1316 ps
->flags
.os_accessible
= 1;
1319 ps
->power
= -1; /* Unknown - driver assigned */
1320 ps
->latency
= -1; /* Unknown - driver assigned */
1323 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1329 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1330 status
= acpi_get_handle(device
->handle
, "_PS0", &handle
);
1331 if (ACPI_FAILURE(status
)) {
1332 status
= acpi_get_handle(device
->handle
, "_PR0", &handle
);
1333 if (ACPI_FAILURE(status
))
1337 device
->flags
.power_manageable
= 1;
1340 * Power Management Flags
1342 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
1343 if (ACPI_SUCCESS(status
))
1344 device
->power
.flags
.explicit_get
= 1;
1345 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
1346 if (ACPI_SUCCESS(status
))
1347 device
->power
.flags
.inrush_current
= 1;
1350 * Enumerate supported power management states
1352 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1353 acpi_bus_init_power_state(device
, i
);
1355 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1357 /* Set defaults for D0 and D3 states (always valid) */
1358 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1359 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1360 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
1361 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
1363 /* Set D3cold's explicit_set flag if _PS3 exists. */
1364 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1365 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1367 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1368 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1369 device
->power
.flags
.power_resources
)
1370 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1372 if (acpi_bus_init_power(device
)) {
1373 acpi_free_power_resources_lists(device
);
1374 device
->flags
.power_manageable
= 0;
1378 static void acpi_bus_get_flags(struct acpi_device
*device
)
1380 acpi_status status
= AE_OK
;
1381 acpi_handle temp
= NULL
;
1383 /* Presence of _STA indicates 'dynamic_status' */
1384 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
1385 if (ACPI_SUCCESS(status
))
1386 device
->flags
.dynamic_status
= 1;
1388 /* Presence of _RMV indicates 'removable' */
1389 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
1390 if (ACPI_SUCCESS(status
))
1391 device
->flags
.removable
= 1;
1393 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1394 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
1395 if (ACPI_SUCCESS(status
))
1396 device
->flags
.ejectable
= 1;
1398 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
1399 if (ACPI_SUCCESS(status
))
1400 device
->flags
.ejectable
= 1;
1404 static void acpi_device_get_busid(struct acpi_device
*device
)
1406 char bus_id
[5] = { '?', 0 };
1407 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1413 * The device's Bus ID is simply the object name.
1414 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1416 if (ACPI_IS_ROOT_DEVICE(device
)) {
1417 strcpy(device
->pnp
.bus_id
, "ACPI");
1421 switch (device
->device_type
) {
1422 case ACPI_BUS_TYPE_POWER_BUTTON
:
1423 strcpy(device
->pnp
.bus_id
, "PWRF");
1425 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1426 strcpy(device
->pnp
.bus_id
, "SLPF");
1429 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1430 /* Clean up trailing underscores (if any) */
1431 for (i
= 3; i
> 1; i
--) {
1432 if (bus_id
[i
] == '_')
1437 strcpy(device
->pnp
.bus_id
, bus_id
);
1443 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1445 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1446 * then we can safely call it an ejectable drive bay
1448 static int acpi_bay_match(acpi_handle handle
)
1452 acpi_handle phandle
;
1454 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
1455 if (ACPI_FAILURE(status
))
1458 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
1459 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
1460 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
1461 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
1464 if (acpi_get_parent(handle
, &phandle
))
1467 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
1468 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
1469 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
1470 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
1477 * acpi_dock_match - see if an acpi object has a _DCK method
1479 static int acpi_dock_match(acpi_handle handle
)
1482 return acpi_get_handle(handle
, "_DCK", &tmp
);
1485 const char *acpi_device_hid(struct acpi_device
*device
)
1487 struct acpi_hardware_id
*hid
;
1489 if (list_empty(&device
->pnp
.ids
))
1492 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1495 EXPORT_SYMBOL(acpi_device_hid
);
1497 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1499 struct acpi_hardware_id
*id
;
1501 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1505 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1511 list_add_tail(&id
->list
, &pnp
->ids
);
1512 pnp
->type
.hardware_id
= 1;
1516 * Old IBM workstations have a DSDT bug wherein the SMBus object
1517 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1518 * prefix. Work around this.
1520 static int acpi_ibm_smbus_match(acpi_handle handle
)
1522 acpi_handle h_dummy
;
1523 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1526 if (!dmi_name_in_vendors("IBM"))
1529 /* Look for SMBS object */
1530 result
= acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
);
1534 if (strcmp("SMBS", path
.pointer
)) {
1539 /* Does it have the necessary (but misnamed) methods? */
1541 if (ACPI_SUCCESS(acpi_get_handle(handle
, "SBI", &h_dummy
)) &&
1542 ACPI_SUCCESS(acpi_get_handle(handle
, "SBR", &h_dummy
)) &&
1543 ACPI_SUCCESS(acpi_get_handle(handle
, "SBW", &h_dummy
)))
1546 kfree(path
.pointer
);
1550 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
1554 struct acpi_device_info
*info
;
1555 struct acpi_pnp_device_id_list
*cid_list
;
1558 switch (device_type
) {
1559 case ACPI_BUS_TYPE_DEVICE
:
1560 if (handle
== ACPI_ROOT_OBJECT
) {
1561 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
1565 status
= acpi_get_object_info(handle
, &info
);
1566 if (ACPI_FAILURE(status
)) {
1567 pr_err(PREFIX
"%s: Error reading device info\n",
1572 if (info
->valid
& ACPI_VALID_HID
)
1573 acpi_add_id(pnp
, info
->hardware_id
.string
);
1574 if (info
->valid
& ACPI_VALID_CID
) {
1575 cid_list
= &info
->compatible_id_list
;
1576 for (i
= 0; i
< cid_list
->count
; i
++)
1577 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
1579 if (info
->valid
& ACPI_VALID_ADR
) {
1580 pnp
->bus_address
= info
->address
;
1581 pnp
->type
.bus_address
= 1;
1583 if (info
->valid
& ACPI_VALID_UID
)
1584 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
1590 * Some devices don't reliably have _HIDs & _CIDs, so add
1591 * synthetic HIDs to make sure drivers can find them.
1593 if (acpi_is_video_device(handle
))
1594 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
1595 else if (ACPI_SUCCESS(acpi_bay_match(handle
)))
1596 acpi_add_id(pnp
, ACPI_BAY_HID
);
1597 else if (ACPI_SUCCESS(acpi_dock_match(handle
)))
1598 acpi_add_id(pnp
, ACPI_DOCK_HID
);
1599 else if (!acpi_ibm_smbus_match(handle
))
1600 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
1601 else if (list_empty(&pnp
->ids
) && handle
== ACPI_ROOT_OBJECT
) {
1602 acpi_add_id(pnp
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1603 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
1604 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
1608 case ACPI_BUS_TYPE_POWER
:
1609 acpi_add_id(pnp
, ACPI_POWER_HID
);
1611 case ACPI_BUS_TYPE_PROCESSOR
:
1612 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
1614 case ACPI_BUS_TYPE_THERMAL
:
1615 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
1617 case ACPI_BUS_TYPE_POWER_BUTTON
:
1618 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
1620 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1621 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
1626 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
1628 struct acpi_hardware_id
*id
, *tmp
;
1630 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
1634 kfree(pnp
->unique_id
);
1637 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
1638 int type
, unsigned long long sta
)
1640 INIT_LIST_HEAD(&device
->pnp
.ids
);
1641 device
->device_type
= type
;
1642 device
->handle
= handle
;
1643 device
->parent
= acpi_bus_get_parent(handle
);
1644 STRUCT_TO_INT(device
->status
) = sta
;
1645 acpi_device_get_busid(device
);
1646 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
1647 acpi_bus_get_flags(device
);
1648 device
->flags
.match_driver
= false;
1649 device_initialize(&device
->dev
);
1650 dev_set_uevent_suppress(&device
->dev
, true);
1653 void acpi_device_add_finalize(struct acpi_device
*device
)
1655 device
->flags
.match_driver
= true;
1656 dev_set_uevent_suppress(&device
->dev
, false);
1657 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
1660 static int acpi_add_single_object(struct acpi_device
**child
,
1661 acpi_handle handle
, int type
,
1662 unsigned long long sta
)
1665 struct acpi_device
*device
;
1666 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1668 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1670 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1674 acpi_init_device_object(device
, handle
, type
, sta
);
1675 acpi_bus_get_power_flags(device
);
1676 acpi_bus_get_wakeup_device_flags(device
);
1678 result
= acpi_device_add(device
, acpi_device_release
);
1680 acpi_device_release(&device
->dev
);
1684 acpi_power_add_remove_device(device
, true);
1685 acpi_device_add_finalize(device
);
1686 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1687 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
1688 dev_name(&device
->dev
), (char *) buffer
.pointer
,
1689 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
1690 kfree(buffer
.pointer
);
1695 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1696 unsigned long long *sta
)
1699 acpi_object_type acpi_type
;
1701 status
= acpi_get_type(handle
, &acpi_type
);
1702 if (ACPI_FAILURE(status
))
1705 switch (acpi_type
) {
1706 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1707 case ACPI_TYPE_DEVICE
:
1708 *type
= ACPI_BUS_TYPE_DEVICE
;
1709 status
= acpi_bus_get_status_handle(handle
, sta
);
1710 if (ACPI_FAILURE(status
))
1713 case ACPI_TYPE_PROCESSOR
:
1714 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1715 status
= acpi_bus_get_status_handle(handle
, sta
);
1716 if (ACPI_FAILURE(status
))
1719 case ACPI_TYPE_THERMAL
:
1720 *type
= ACPI_BUS_TYPE_THERMAL
;
1721 *sta
= ACPI_STA_DEFAULT
;
1723 case ACPI_TYPE_POWER
:
1724 *type
= ACPI_BUS_TYPE_POWER
;
1725 *sta
= ACPI_STA_DEFAULT
;
1734 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
1736 const struct acpi_device_id
**matchid
)
1738 const struct acpi_device_id
*devid
;
1740 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
1741 if (!strcmp((char *)devid
->id
, idstr
)) {
1751 static struct acpi_scan_handler
*acpi_scan_match_handler(char *idstr
,
1752 const struct acpi_device_id
**matchid
)
1754 struct acpi_scan_handler
*handler
;
1756 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
1757 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
1763 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
1765 if (!!hotplug
->enabled
== !!val
)
1768 mutex_lock(&acpi_scan_lock
);
1770 hotplug
->enabled
= val
;
1772 mutex_unlock(&acpi_scan_lock
);
1775 static void acpi_scan_init_hotplug(acpi_handle handle
, int type
)
1777 struct acpi_device_pnp pnp
= {};
1778 struct acpi_hardware_id
*hwid
;
1779 struct acpi_scan_handler
*handler
;
1781 INIT_LIST_HEAD(&pnp
.ids
);
1782 acpi_set_pnp_ids(handle
, &pnp
, type
);
1784 if (!pnp
.type
.hardware_id
)
1788 * This relies on the fact that acpi_install_notify_handler() will not
1789 * install the same notify handler routine twice for the same handle.
1791 list_for_each_entry(hwid
, &pnp
.ids
, list
) {
1792 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
1794 acpi_install_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
1795 acpi_hotplug_notify_cb
, handler
);
1801 acpi_free_pnp_ids(&pnp
);
1804 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
1805 void *not_used
, void **return_value
)
1807 struct acpi_device
*device
= NULL
;
1809 unsigned long long sta
;
1813 acpi_bus_get_device(handle
, &device
);
1817 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1821 if (type
== ACPI_BUS_TYPE_POWER
) {
1822 acpi_add_power_resource(handle
);
1826 acpi_scan_init_hotplug(handle
, type
);
1828 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1829 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
)) {
1830 struct acpi_device_wakeup wakeup
;
1833 status
= acpi_get_handle(handle
, "_PRW", &temp
);
1834 if (ACPI_SUCCESS(status
)) {
1835 acpi_bus_extract_wakeup_device_power_package(handle
,
1837 acpi_power_resources_list_free(&wakeup
.resources
);
1839 return AE_CTRL_DEPTH
;
1842 acpi_add_single_object(&device
, handle
, type
, sta
);
1844 return AE_CTRL_DEPTH
;
1848 *return_value
= device
;
1853 static int acpi_scan_attach_handler(struct acpi_device
*device
)
1855 struct acpi_hardware_id
*hwid
;
1858 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1859 const struct acpi_device_id
*devid
;
1860 struct acpi_scan_handler
*handler
;
1862 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
1864 ret
= handler
->attach(device
, devid
);
1866 device
->handler
= handler
;
1868 } else if (ret
< 0) {
1876 static acpi_status
acpi_bus_device_attach(acpi_handle handle
, u32 lvl_not_used
,
1877 void *not_used
, void **ret_not_used
)
1879 struct acpi_device
*device
;
1880 unsigned long long sta_not_used
;
1884 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1885 * namespace walks prematurely.
1887 if (acpi_bus_type_and_status(handle
, &ret
, &sta_not_used
))
1890 if (acpi_bus_get_device(handle
, &device
))
1891 return AE_CTRL_DEPTH
;
1893 ret
= acpi_scan_attach_handler(device
);
1895 return ret
> 0 ? AE_OK
: AE_CTRL_DEPTH
;
1897 ret
= device_attach(&device
->dev
);
1898 return ret
>= 0 ? AE_OK
: AE_CTRL_DEPTH
;
1902 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1903 * @handle: Root of the namespace scope to scan.
1905 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1908 * If no devices were found, -ENODEV is returned, but it does not mean that
1909 * there has been a real error. There just have been no suitable ACPI objects
1910 * in the table trunk from which the kernel could create a device and add an
1911 * appropriate driver.
1913 * Must be called under acpi_scan_lock.
1915 int acpi_bus_scan(acpi_handle handle
)
1917 void *device
= NULL
;
1920 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
1921 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1922 acpi_bus_check_add
, NULL
, NULL
, &device
);
1926 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle
, 0, NULL
, NULL
)))
1927 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1928 acpi_bus_device_attach
, NULL
, NULL
, NULL
);
1932 EXPORT_SYMBOL(acpi_bus_scan
);
1934 static acpi_status
acpi_bus_device_detach(acpi_handle handle
, u32 lvl_not_used
,
1935 void *not_used
, void **ret_not_used
)
1937 struct acpi_device
*device
= NULL
;
1939 if (!acpi_bus_get_device(handle
, &device
)) {
1940 struct acpi_scan_handler
*dev_handler
= device
->handler
;
1942 device
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1944 if (dev_handler
->detach
)
1945 dev_handler
->detach(device
);
1947 device
->handler
= NULL
;
1949 device_release_driver(&device
->dev
);
1955 static acpi_status
acpi_bus_remove(acpi_handle handle
, u32 lvl_not_used
,
1956 void *not_used
, void **ret_not_used
)
1958 struct acpi_device
*device
= NULL
;
1960 if (!acpi_bus_get_device(handle
, &device
))
1961 acpi_device_unregister(device
);
1967 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1968 * @start: Root of the ACPI device nodes subtree to remove.
1970 * Must be called under acpi_scan_lock.
1972 void acpi_bus_trim(struct acpi_device
*start
)
1975 * Execute acpi_bus_device_detach() as a post-order callback to detach
1976 * all ACPI drivers from the device nodes being removed.
1978 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
1979 acpi_bus_device_detach
, NULL
, NULL
);
1980 acpi_bus_device_detach(start
->handle
, 0, NULL
, NULL
);
1982 * Execute acpi_bus_remove() as a post-order callback to remove device
1983 * nodes in the given namespace scope.
1985 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
1986 acpi_bus_remove
, NULL
, NULL
);
1987 acpi_bus_remove(start
->handle
, 0, NULL
, NULL
);
1989 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1991 static int acpi_bus_scan_fixed(void)
1996 * Enumerate all fixed-feature devices.
1998 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
1999 struct acpi_device
*device
= NULL
;
2001 result
= acpi_add_single_object(&device
, NULL
,
2002 ACPI_BUS_TYPE_POWER_BUTTON
,
2007 result
= device_attach(&device
->dev
);
2011 device_init_wakeup(&device
->dev
, true);
2014 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
2015 struct acpi_device
*device
= NULL
;
2017 result
= acpi_add_single_object(&device
, NULL
,
2018 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2023 result
= device_attach(&device
->dev
);
2026 return result
< 0 ? result
: 0;
2029 int __init
acpi_scan_init(void)
2033 result
= bus_register(&acpi_bus_type
);
2035 /* We don't want to quit even if we failed to add suspend/resume */
2036 printk(KERN_ERR PREFIX
"Could not register bus type\n");
2039 acpi_pci_root_init();
2040 acpi_pci_link_init();
2041 acpi_platform_init();
2043 acpi_container_init();
2044 acpi_memory_hotplug_init();
2047 mutex_lock(&acpi_scan_lock
);
2049 * Enumerate devices in the ACPI namespace.
2051 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2055 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2059 result
= acpi_bus_scan_fixed();
2061 acpi_device_unregister(acpi_root
);
2065 acpi_update_all_gpes();
2067 acpi_pci_root_hp_init();
2070 mutex_unlock(&acpi_scan_lock
);