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
);
1021 device
->driver
= NULL
;
1022 device
->driver_data
= NULL
;
1026 device
->driver
= driver
;
1029 * TBD - Configuration Management: Assign resources to device based
1030 * upon possible configuration and currently allocated resources.
1033 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1034 "Driver successfully bound to device\n"));
1039 * acpi_bus_register_driver - register a driver with the ACPI bus
1040 * @driver: driver being registered
1042 * Registers a driver with the ACPI bus. Searches the namespace for all
1043 * devices that match the driver's criteria and binds. Returns zero for
1044 * success or a negative error status for failure.
1046 int acpi_bus_register_driver(struct acpi_driver
*driver
)
1052 driver
->drv
.name
= driver
->name
;
1053 driver
->drv
.bus
= &acpi_bus_type
;
1054 driver
->drv
.owner
= driver
->owner
;
1056 ret
= driver_register(&driver
->drv
);
1060 EXPORT_SYMBOL(acpi_bus_register_driver
);
1063 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1064 * @driver: driver to unregister
1066 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1067 * devices that match the driver's criteria and unbinds.
1069 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
1071 driver_unregister(&driver
->drv
);
1074 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
1076 /* --------------------------------------------------------------------------
1078 -------------------------------------------------------------------------- */
1079 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
1081 struct acpi_device
*device
= NULL
;
1085 * Fixed hardware devices do not appear in the namespace and do not
1086 * have handles, but we fabricate acpi_devices for them, so we have
1087 * to deal with them specially.
1093 status
= acpi_get_parent(handle
, &handle
);
1094 if (ACPI_FAILURE(status
))
1095 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
1096 } while (acpi_bus_get_device(handle
, &device
));
1101 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
1105 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1106 union acpi_object
*obj
;
1108 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
1109 if (ACPI_FAILURE(status
))
1112 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
1113 if (ACPI_SUCCESS(status
)) {
1114 obj
= buffer
.pointer
;
1115 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
1117 kfree(buffer
.pointer
);
1121 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
1123 void acpi_bus_data_handler(acpi_handle handle
, void *context
)
1131 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
1132 struct acpi_device_wakeup
*wakeup
)
1134 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1135 union acpi_object
*package
= NULL
;
1136 union acpi_object
*element
= NULL
;
1143 INIT_LIST_HEAD(&wakeup
->resources
);
1146 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
1147 if (ACPI_FAILURE(status
)) {
1148 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
1152 package
= (union acpi_object
*)buffer
.pointer
;
1154 if (!package
|| package
->package
.count
< 2)
1157 element
= &(package
->package
.elements
[0]);
1161 if (element
->type
== ACPI_TYPE_PACKAGE
) {
1162 if ((element
->package
.count
< 2) ||
1163 (element
->package
.elements
[0].type
!=
1164 ACPI_TYPE_LOCAL_REFERENCE
)
1165 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
1168 wakeup
->gpe_device
=
1169 element
->package
.elements
[0].reference
.handle
;
1170 wakeup
->gpe_number
=
1171 (u32
) element
->package
.elements
[1].integer
.value
;
1172 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
1173 wakeup
->gpe_device
= NULL
;
1174 wakeup
->gpe_number
= element
->integer
.value
;
1179 element
= &(package
->package
.elements
[1]);
1180 if (element
->type
!= ACPI_TYPE_INTEGER
)
1183 wakeup
->sleep_state
= element
->integer
.value
;
1185 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
1189 if (!list_empty(&wakeup
->resources
)) {
1192 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
1195 acpi_handle_warn(handle
, "Retrieving current states "
1196 "of wakeup power resources failed\n");
1197 acpi_power_resources_list_free(&wakeup
->resources
);
1200 if (sleep_state
< wakeup
->sleep_state
) {
1201 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
1202 "(S%d) by S%d from power resources\n",
1203 (int)wakeup
->sleep_state
, sleep_state
);
1204 wakeup
->sleep_state
= sleep_state
;
1207 acpi_setup_gpe_for_wake(handle
, wakeup
->gpe_device
, wakeup
->gpe_number
);
1210 kfree(buffer
.pointer
);
1214 static void acpi_bus_set_run_wake_flags(struct acpi_device
*device
)
1216 struct acpi_device_id button_device_ids
[] = {
1223 acpi_event_status event_status
;
1225 device
->wakeup
.flags
.notifier_present
= 0;
1227 /* Power button, Lid switch always enable wakeup */
1228 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1229 device
->wakeup
.flags
.run_wake
= 1;
1230 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1231 /* Do not use Lid/sleep button for S5 wakeup */
1232 if (device
->wakeup
.sleep_state
== ACPI_STATE_S5
)
1233 device
->wakeup
.sleep_state
= ACPI_STATE_S4
;
1235 device_set_wakeup_capable(&device
->dev
, true);
1239 status
= acpi_get_gpe_status(device
->wakeup
.gpe_device
,
1240 device
->wakeup
.gpe_number
,
1242 if (status
== AE_OK
)
1243 device
->wakeup
.flags
.run_wake
=
1244 !!(event_status
& ACPI_EVENT_FLAG_HANDLE
);
1247 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1250 acpi_status status
= 0;
1253 /* Presence of _PRW indicates wake capable */
1254 status
= acpi_get_handle(device
->handle
, "_PRW", &temp
);
1255 if (ACPI_FAILURE(status
))
1258 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1261 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1265 device
->wakeup
.flags
.valid
= 1;
1266 device
->wakeup
.prepare_count
= 0;
1267 acpi_bus_set_run_wake_flags(device
);
1268 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1269 * system for the ACPI device with the _PRW object.
1270 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1271 * So it is necessary to call _DSW object first. Only when it is not
1272 * present will the _PSW object used.
1274 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1276 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1277 "error in _DSW or _PSW evaluation\n"));
1280 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1282 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1283 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1284 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1288 INIT_LIST_HEAD(&ps
->resources
);
1290 /* Evaluate "_PRx" to get referenced power resources */
1291 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1292 if (ACPI_SUCCESS(status
)) {
1293 union acpi_object
*package
= buffer
.pointer
;
1295 if (buffer
.length
&& package
1296 && package
->type
== ACPI_TYPE_PACKAGE
1297 && package
->package
.count
) {
1298 int err
= acpi_extract_power_resources(package
, 0,
1301 device
->power
.flags
.power_resources
= 1;
1303 ACPI_FREE(buffer
.pointer
);
1306 /* Evaluate "_PSx" to see if we can do explicit sets */
1308 status
= acpi_get_handle(device
->handle
, pathname
, &handle
);
1309 if (ACPI_SUCCESS(status
))
1310 ps
->flags
.explicit_set
= 1;
1313 * State is valid if there are means to put the device into it.
1314 * D3hot is only valid if _PR3 present.
1316 if (!list_empty(&ps
->resources
)
1317 || (ps
->flags
.explicit_set
&& state
< ACPI_STATE_D3_HOT
)) {
1318 ps
->flags
.valid
= 1;
1319 ps
->flags
.os_accessible
= 1;
1322 ps
->power
= -1; /* Unknown - driver assigned */
1323 ps
->latency
= -1; /* Unknown - driver assigned */
1326 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1332 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1333 status
= acpi_get_handle(device
->handle
, "_PS0", &handle
);
1334 if (ACPI_FAILURE(status
)) {
1335 status
= acpi_get_handle(device
->handle
, "_PR0", &handle
);
1336 if (ACPI_FAILURE(status
))
1340 device
->flags
.power_manageable
= 1;
1343 * Power Management Flags
1345 status
= acpi_get_handle(device
->handle
, "_PSC", &handle
);
1346 if (ACPI_SUCCESS(status
))
1347 device
->power
.flags
.explicit_get
= 1;
1348 status
= acpi_get_handle(device
->handle
, "_IRC", &handle
);
1349 if (ACPI_SUCCESS(status
))
1350 device
->power
.flags
.inrush_current
= 1;
1353 * Enumerate supported power management states
1355 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1356 acpi_bus_init_power_state(device
, i
);
1358 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1360 /* Set defaults for D0 and D3 states (always valid) */
1361 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1362 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1363 device
->power
.states
[ACPI_STATE_D3
].flags
.valid
= 1;
1364 device
->power
.states
[ACPI_STATE_D3
].power
= 0;
1366 /* Set D3cold's explicit_set flag if _PS3 exists. */
1367 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1368 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1370 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1371 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1372 device
->power
.flags
.power_resources
)
1373 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1375 if (acpi_bus_init_power(device
)) {
1376 acpi_free_power_resources_lists(device
);
1377 device
->flags
.power_manageable
= 0;
1381 static void acpi_bus_get_flags(struct acpi_device
*device
)
1383 acpi_status status
= AE_OK
;
1384 acpi_handle temp
= NULL
;
1386 /* Presence of _STA indicates 'dynamic_status' */
1387 status
= acpi_get_handle(device
->handle
, "_STA", &temp
);
1388 if (ACPI_SUCCESS(status
))
1389 device
->flags
.dynamic_status
= 1;
1391 /* Presence of _RMV indicates 'removable' */
1392 status
= acpi_get_handle(device
->handle
, "_RMV", &temp
);
1393 if (ACPI_SUCCESS(status
))
1394 device
->flags
.removable
= 1;
1396 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1397 status
= acpi_get_handle(device
->handle
, "_EJD", &temp
);
1398 if (ACPI_SUCCESS(status
))
1399 device
->flags
.ejectable
= 1;
1401 status
= acpi_get_handle(device
->handle
, "_EJ0", &temp
);
1402 if (ACPI_SUCCESS(status
))
1403 device
->flags
.ejectable
= 1;
1407 static void acpi_device_get_busid(struct acpi_device
*device
)
1409 char bus_id
[5] = { '?', 0 };
1410 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1416 * The device's Bus ID is simply the object name.
1417 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1419 if (ACPI_IS_ROOT_DEVICE(device
)) {
1420 strcpy(device
->pnp
.bus_id
, "ACPI");
1424 switch (device
->device_type
) {
1425 case ACPI_BUS_TYPE_POWER_BUTTON
:
1426 strcpy(device
->pnp
.bus_id
, "PWRF");
1428 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1429 strcpy(device
->pnp
.bus_id
, "SLPF");
1432 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1433 /* Clean up trailing underscores (if any) */
1434 for (i
= 3; i
> 1; i
--) {
1435 if (bus_id
[i
] == '_')
1440 strcpy(device
->pnp
.bus_id
, bus_id
);
1446 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1448 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1449 * then we can safely call it an ejectable drive bay
1451 static int acpi_bay_match(acpi_handle handle
)
1455 acpi_handle phandle
;
1457 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
1458 if (ACPI_FAILURE(status
))
1461 if ((ACPI_SUCCESS(acpi_get_handle(handle
, "_GTF", &tmp
))) ||
1462 (ACPI_SUCCESS(acpi_get_handle(handle
, "_GTM", &tmp
))) ||
1463 (ACPI_SUCCESS(acpi_get_handle(handle
, "_STM", &tmp
))) ||
1464 (ACPI_SUCCESS(acpi_get_handle(handle
, "_SDD", &tmp
))))
1467 if (acpi_get_parent(handle
, &phandle
))
1470 if ((ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTF", &tmp
))) ||
1471 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_GTM", &tmp
))) ||
1472 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_STM", &tmp
))) ||
1473 (ACPI_SUCCESS(acpi_get_handle(phandle
, "_SDD", &tmp
))))
1480 * acpi_dock_match - see if an acpi object has a _DCK method
1482 static int acpi_dock_match(acpi_handle handle
)
1485 return acpi_get_handle(handle
, "_DCK", &tmp
);
1488 const char *acpi_device_hid(struct acpi_device
*device
)
1490 struct acpi_hardware_id
*hid
;
1492 if (list_empty(&device
->pnp
.ids
))
1495 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1498 EXPORT_SYMBOL(acpi_device_hid
);
1500 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1502 struct acpi_hardware_id
*id
;
1504 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1508 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1514 list_add_tail(&id
->list
, &pnp
->ids
);
1515 pnp
->type
.hardware_id
= 1;
1519 * Old IBM workstations have a DSDT bug wherein the SMBus object
1520 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1521 * prefix. Work around this.
1523 static int acpi_ibm_smbus_match(acpi_handle handle
)
1525 acpi_handle h_dummy
;
1526 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1529 if (!dmi_name_in_vendors("IBM"))
1532 /* Look for SMBS object */
1533 result
= acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
);
1537 if (strcmp("SMBS", path
.pointer
)) {
1542 /* Does it have the necessary (but misnamed) methods? */
1544 if (ACPI_SUCCESS(acpi_get_handle(handle
, "SBI", &h_dummy
)) &&
1545 ACPI_SUCCESS(acpi_get_handle(handle
, "SBR", &h_dummy
)) &&
1546 ACPI_SUCCESS(acpi_get_handle(handle
, "SBW", &h_dummy
)))
1549 kfree(path
.pointer
);
1553 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
1557 struct acpi_device_info
*info
;
1558 struct acpi_pnp_device_id_list
*cid_list
;
1561 switch (device_type
) {
1562 case ACPI_BUS_TYPE_DEVICE
:
1563 if (handle
== ACPI_ROOT_OBJECT
) {
1564 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
1568 status
= acpi_get_object_info(handle
, &info
);
1569 if (ACPI_FAILURE(status
)) {
1570 pr_err(PREFIX
"%s: Error reading device info\n",
1575 if (info
->valid
& ACPI_VALID_HID
)
1576 acpi_add_id(pnp
, info
->hardware_id
.string
);
1577 if (info
->valid
& ACPI_VALID_CID
) {
1578 cid_list
= &info
->compatible_id_list
;
1579 for (i
= 0; i
< cid_list
->count
; i
++)
1580 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
1582 if (info
->valid
& ACPI_VALID_ADR
) {
1583 pnp
->bus_address
= info
->address
;
1584 pnp
->type
.bus_address
= 1;
1586 if (info
->valid
& ACPI_VALID_UID
)
1587 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
1593 * Some devices don't reliably have _HIDs & _CIDs, so add
1594 * synthetic HIDs to make sure drivers can find them.
1596 if (acpi_is_video_device(handle
))
1597 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
1598 else if (ACPI_SUCCESS(acpi_bay_match(handle
)))
1599 acpi_add_id(pnp
, ACPI_BAY_HID
);
1600 else if (ACPI_SUCCESS(acpi_dock_match(handle
)))
1601 acpi_add_id(pnp
, ACPI_DOCK_HID
);
1602 else if (!acpi_ibm_smbus_match(handle
))
1603 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
1604 else if (list_empty(&pnp
->ids
) && handle
== ACPI_ROOT_OBJECT
) {
1605 acpi_add_id(pnp
, ACPI_BUS_HID
); /* \_SB, LNXSYBUS */
1606 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
1607 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
1611 case ACPI_BUS_TYPE_POWER
:
1612 acpi_add_id(pnp
, ACPI_POWER_HID
);
1614 case ACPI_BUS_TYPE_PROCESSOR
:
1615 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
1617 case ACPI_BUS_TYPE_THERMAL
:
1618 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
1620 case ACPI_BUS_TYPE_POWER_BUTTON
:
1621 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
1623 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1624 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
1629 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
1631 struct acpi_hardware_id
*id
, *tmp
;
1633 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
1637 kfree(pnp
->unique_id
);
1640 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
1641 int type
, unsigned long long sta
)
1643 INIT_LIST_HEAD(&device
->pnp
.ids
);
1644 device
->device_type
= type
;
1645 device
->handle
= handle
;
1646 device
->parent
= acpi_bus_get_parent(handle
);
1647 STRUCT_TO_INT(device
->status
) = sta
;
1648 acpi_device_get_busid(device
);
1649 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
1650 acpi_bus_get_flags(device
);
1651 device
->flags
.match_driver
= false;
1652 device_initialize(&device
->dev
);
1653 dev_set_uevent_suppress(&device
->dev
, true);
1656 void acpi_device_add_finalize(struct acpi_device
*device
)
1658 device
->flags
.match_driver
= true;
1659 dev_set_uevent_suppress(&device
->dev
, false);
1660 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
1663 static int acpi_add_single_object(struct acpi_device
**child
,
1664 acpi_handle handle
, int type
,
1665 unsigned long long sta
)
1668 struct acpi_device
*device
;
1669 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1671 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1673 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1677 acpi_init_device_object(device
, handle
, type
, sta
);
1678 acpi_bus_get_power_flags(device
);
1679 acpi_bus_get_wakeup_device_flags(device
);
1681 result
= acpi_device_add(device
, acpi_device_release
);
1683 acpi_device_release(&device
->dev
);
1687 acpi_power_add_remove_device(device
, true);
1688 acpi_device_add_finalize(device
);
1689 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1690 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
1691 dev_name(&device
->dev
), (char *) buffer
.pointer
,
1692 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
1693 kfree(buffer
.pointer
);
1698 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1699 unsigned long long *sta
)
1702 acpi_object_type acpi_type
;
1704 status
= acpi_get_type(handle
, &acpi_type
);
1705 if (ACPI_FAILURE(status
))
1708 switch (acpi_type
) {
1709 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1710 case ACPI_TYPE_DEVICE
:
1711 *type
= ACPI_BUS_TYPE_DEVICE
;
1712 status
= acpi_bus_get_status_handle(handle
, sta
);
1713 if (ACPI_FAILURE(status
))
1716 case ACPI_TYPE_PROCESSOR
:
1717 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1718 status
= acpi_bus_get_status_handle(handle
, sta
);
1719 if (ACPI_FAILURE(status
))
1722 case ACPI_TYPE_THERMAL
:
1723 *type
= ACPI_BUS_TYPE_THERMAL
;
1724 *sta
= ACPI_STA_DEFAULT
;
1726 case ACPI_TYPE_POWER
:
1727 *type
= ACPI_BUS_TYPE_POWER
;
1728 *sta
= ACPI_STA_DEFAULT
;
1737 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
1739 const struct acpi_device_id
**matchid
)
1741 const struct acpi_device_id
*devid
;
1743 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
1744 if (!strcmp((char *)devid
->id
, idstr
)) {
1754 static struct acpi_scan_handler
*acpi_scan_match_handler(char *idstr
,
1755 const struct acpi_device_id
**matchid
)
1757 struct acpi_scan_handler
*handler
;
1759 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
1760 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
1766 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
1768 if (!!hotplug
->enabled
== !!val
)
1771 mutex_lock(&acpi_scan_lock
);
1773 hotplug
->enabled
= val
;
1775 mutex_unlock(&acpi_scan_lock
);
1778 static void acpi_scan_init_hotplug(acpi_handle handle
, int type
)
1780 struct acpi_device_pnp pnp
= {};
1781 struct acpi_hardware_id
*hwid
;
1782 struct acpi_scan_handler
*handler
;
1784 INIT_LIST_HEAD(&pnp
.ids
);
1785 acpi_set_pnp_ids(handle
, &pnp
, type
);
1787 if (!pnp
.type
.hardware_id
)
1791 * This relies on the fact that acpi_install_notify_handler() will not
1792 * install the same notify handler routine twice for the same handle.
1794 list_for_each_entry(hwid
, &pnp
.ids
, list
) {
1795 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
1797 acpi_install_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
1798 acpi_hotplug_notify_cb
, handler
);
1804 acpi_free_pnp_ids(&pnp
);
1807 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
1808 void *not_used
, void **return_value
)
1810 struct acpi_device
*device
= NULL
;
1812 unsigned long long sta
;
1816 acpi_bus_get_device(handle
, &device
);
1820 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1824 if (type
== ACPI_BUS_TYPE_POWER
) {
1825 acpi_add_power_resource(handle
);
1829 acpi_scan_init_hotplug(handle
, type
);
1831 if (!(sta
& ACPI_STA_DEVICE_PRESENT
) &&
1832 !(sta
& ACPI_STA_DEVICE_FUNCTIONING
)) {
1833 struct acpi_device_wakeup wakeup
;
1836 status
= acpi_get_handle(handle
, "_PRW", &temp
);
1837 if (ACPI_SUCCESS(status
)) {
1838 acpi_bus_extract_wakeup_device_power_package(handle
,
1840 acpi_power_resources_list_free(&wakeup
.resources
);
1842 return AE_CTRL_DEPTH
;
1845 acpi_add_single_object(&device
, handle
, type
, sta
);
1847 return AE_CTRL_DEPTH
;
1851 *return_value
= device
;
1856 static int acpi_scan_attach_handler(struct acpi_device
*device
)
1858 struct acpi_hardware_id
*hwid
;
1861 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1862 const struct acpi_device_id
*devid
;
1863 struct acpi_scan_handler
*handler
;
1865 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
1867 ret
= handler
->attach(device
, devid
);
1869 device
->handler
= handler
;
1871 } else if (ret
< 0) {
1879 static acpi_status
acpi_bus_device_attach(acpi_handle handle
, u32 lvl_not_used
,
1880 void *not_used
, void **ret_not_used
)
1882 struct acpi_device
*device
;
1883 unsigned long long sta_not_used
;
1887 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1888 * namespace walks prematurely.
1890 if (acpi_bus_type_and_status(handle
, &ret
, &sta_not_used
))
1893 if (acpi_bus_get_device(handle
, &device
))
1894 return AE_CTRL_DEPTH
;
1896 ret
= acpi_scan_attach_handler(device
);
1898 return ret
> 0 ? AE_OK
: AE_CTRL_DEPTH
;
1900 ret
= device_attach(&device
->dev
);
1901 return ret
>= 0 ? AE_OK
: AE_CTRL_DEPTH
;
1905 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1906 * @handle: Root of the namespace scope to scan.
1908 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1911 * If no devices were found, -ENODEV is returned, but it does not mean that
1912 * there has been a real error. There just have been no suitable ACPI objects
1913 * in the table trunk from which the kernel could create a device and add an
1914 * appropriate driver.
1916 * Must be called under acpi_scan_lock.
1918 int acpi_bus_scan(acpi_handle handle
)
1920 void *device
= NULL
;
1923 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
1924 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1925 acpi_bus_check_add
, NULL
, NULL
, &device
);
1929 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle
, 0, NULL
, NULL
)))
1930 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1931 acpi_bus_device_attach
, NULL
, NULL
, NULL
);
1935 EXPORT_SYMBOL(acpi_bus_scan
);
1937 static acpi_status
acpi_bus_device_detach(acpi_handle handle
, u32 lvl_not_used
,
1938 void *not_used
, void **ret_not_used
)
1940 struct acpi_device
*device
= NULL
;
1942 if (!acpi_bus_get_device(handle
, &device
)) {
1943 struct acpi_scan_handler
*dev_handler
= device
->handler
;
1945 device
->removal_type
= ACPI_BUS_REMOVAL_EJECT
;
1947 if (dev_handler
->detach
)
1948 dev_handler
->detach(device
);
1950 device
->handler
= NULL
;
1952 device_release_driver(&device
->dev
);
1958 static acpi_status
acpi_bus_remove(acpi_handle handle
, u32 lvl_not_used
,
1959 void *not_used
, void **ret_not_used
)
1961 struct acpi_device
*device
= NULL
;
1963 if (!acpi_bus_get_device(handle
, &device
))
1964 acpi_device_unregister(device
);
1970 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1971 * @start: Root of the ACPI device nodes subtree to remove.
1973 * Must be called under acpi_scan_lock.
1975 void acpi_bus_trim(struct acpi_device
*start
)
1978 * Execute acpi_bus_device_detach() as a post-order callback to detach
1979 * all ACPI drivers from the device nodes being removed.
1981 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
1982 acpi_bus_device_detach
, NULL
, NULL
);
1983 acpi_bus_device_detach(start
->handle
, 0, NULL
, NULL
);
1985 * Execute acpi_bus_remove() as a post-order callback to remove device
1986 * nodes in the given namespace scope.
1988 acpi_walk_namespace(ACPI_TYPE_ANY
, start
->handle
, ACPI_UINT32_MAX
, NULL
,
1989 acpi_bus_remove
, NULL
, NULL
);
1990 acpi_bus_remove(start
->handle
, 0, NULL
, NULL
);
1992 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1994 static int acpi_bus_scan_fixed(void)
1999 * Enumerate all fixed-feature devices.
2001 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
2002 struct acpi_device
*device
= NULL
;
2004 result
= acpi_add_single_object(&device
, NULL
,
2005 ACPI_BUS_TYPE_POWER_BUTTON
,
2010 result
= device_attach(&device
->dev
);
2014 device_init_wakeup(&device
->dev
, true);
2017 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
2018 struct acpi_device
*device
= NULL
;
2020 result
= acpi_add_single_object(&device
, NULL
,
2021 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2026 result
= device_attach(&device
->dev
);
2029 return result
< 0 ? result
: 0;
2032 int __init
acpi_scan_init(void)
2036 result
= bus_register(&acpi_bus_type
);
2038 /* We don't want to quit even if we failed to add suspend/resume */
2039 printk(KERN_ERR PREFIX
"Could not register bus type\n");
2042 acpi_pci_root_init();
2043 acpi_pci_link_init();
2044 acpi_platform_init();
2047 acpi_container_init();
2048 acpi_memory_hotplug_init();
2050 mutex_lock(&acpi_scan_lock
);
2052 * Enumerate devices in the ACPI namespace.
2054 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2058 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2062 result
= acpi_bus_scan_fixed();
2064 acpi_device_unregister(acpi_root
);
2068 acpi_update_all_gpes();
2070 acpi_pci_root_hp_init();
2073 mutex_unlock(&acpi_scan_lock
);