1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * acpi_bus.h - ACPI Bus Driver ($Revision: 22 $)
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
10 #define __ACPI_BUS_H__
12 #include <linux/device.h>
13 #include <linux/property.h>
15 /* TBD: Make dynamic */
16 #define ACPI_MAX_HANDLES 10
17 struct acpi_handle_list {
19 acpi_handle handles[ACPI_MAX_HANDLES];
24 acpi_extract_package(union acpi_object *package,
25 struct acpi_buffer *format, struct acpi_buffer *buffer);
27 acpi_evaluate_integer(acpi_handle handle,
29 struct acpi_object_list *arguments, unsigned long long *data);
31 acpi_evaluate_reference(acpi_handle handle,
33 struct acpi_object_list *arguments,
34 struct acpi_handle_list *list);
36 acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
37 struct acpi_buffer *status_buf);
40 acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld);
42 bool acpi_has_method(acpi_handle handle, char *name);
43 acpi_status acpi_execute_simple_method(acpi_handle handle, char *method,
45 acpi_status acpi_evaluate_ej0(acpi_handle handle);
46 acpi_status acpi_evaluate_lck(acpi_handle handle, int lock);
47 acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function);
48 bool acpi_ata_match(acpi_handle handle);
49 bool acpi_bay_match(acpi_handle handle);
50 bool acpi_dock_match(acpi_handle handle);
52 bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs);
53 union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid,
54 u64 rev, u64 func, union acpi_object *argv4);
56 static inline union acpi_object *
57 acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *guid, u64 rev,
58 u64 func, union acpi_object *argv4,
59 acpi_object_type type)
61 union acpi_object *obj;
63 obj = acpi_evaluate_dsm(handle, guid, rev, func, argv4);
64 if (obj && obj->type != type) {
73 #define ACPI_INIT_DSM_ARGV4(cnt, eles) \
75 .package.type = ACPI_TYPE_PACKAGE, \
76 .package.count = (cnt), \
77 .package.elements = (eles) \
80 bool acpi_dev_found(const char *hid);
81 bool acpi_dev_present(const char *hid, const char *uid, s64 hrv);
82 bool acpi_reduced_hardware(void);
86 struct proc_dir_entry;
88 #define ACPI_BUS_FILE_ROOT "acpi"
89 extern struct proc_dir_entry *acpi_root_dir;
91 enum acpi_bus_device_type {
92 ACPI_BUS_TYPE_DEVICE = 0,
94 ACPI_BUS_TYPE_PROCESSOR,
95 ACPI_BUS_TYPE_THERMAL,
96 ACPI_BUS_TYPE_POWER_BUTTON,
97 ACPI_BUS_TYPE_SLEEP_BUTTON,
98 ACPI_BUS_TYPE_ECDT_EC,
99 ACPI_BUS_DEVICE_TYPE_COUNT
110 struct acpi_hotplug_profile {
112 int (*scan_dependent)(struct acpi_device *adev);
113 void (*notify_online)(struct acpi_device *adev);
115 bool demand_offline:1;
118 static inline struct acpi_hotplug_profile *to_acpi_hotplug_profile(
119 struct kobject *kobj)
121 return container_of(kobj, struct acpi_hotplug_profile, kobj);
124 struct acpi_scan_handler {
125 const struct acpi_device_id *ids;
126 struct list_head list_node;
127 bool (*match)(const char *idstr, const struct acpi_device_id **matchid);
128 int (*attach)(struct acpi_device *dev, const struct acpi_device_id *id);
129 void (*detach)(struct acpi_device *dev);
130 void (*bind)(struct device *phys_dev);
131 void (*unbind)(struct device *phys_dev);
132 struct acpi_hotplug_profile hotplug;
136 * ACPI Hotplug Context
137 * --------------------
140 struct acpi_hotplug_context {
141 struct acpi_device *self;
142 int (*notify)(struct acpi_device *, u32);
143 void (*uevent)(struct acpi_device *, u32);
144 void (*fixup)(struct acpi_device *);
152 typedef int (*acpi_op_add) (struct acpi_device * device);
153 typedef void (*acpi_op_remove) (struct acpi_device *device);
154 typedef void (*acpi_op_notify) (struct acpi_device * device, u32 event);
156 struct acpi_device_ops {
158 acpi_op_remove remove;
159 acpi_op_notify notify;
162 #define ACPI_DRIVER_ALL_NOTIFY_EVENTS 0x1 /* system AND device events */
167 const struct acpi_device_id *ids; /* Supported Hardware IDs */
169 struct acpi_device_ops ops;
170 struct device_driver drv;
171 struct module *owner;
181 struct acpi_device_status {
186 u32 battery_present:1;
192 struct acpi_device_flags {
193 u32 dynamic_status:1;
196 u32 power_manageable:1;
200 u32 hotplug_notify:1;
201 u32 is_dock_station:1;
202 u32 of_compatible_ok:1;
205 u32 enumeration_by_parent:1;
212 struct acpi_device_dir {
213 struct proc_dir_entry *entry;
216 #define acpi_device_dir(d) ((d)->dir.entry)
220 typedef char acpi_bus_id[8];
221 typedef u64 acpi_bus_address;
222 typedef char acpi_device_name[40];
223 typedef char acpi_device_class[20];
225 struct acpi_hardware_id {
226 struct list_head list;
230 struct acpi_pnp_type {
238 struct acpi_device_pnp {
239 acpi_bus_id bus_id; /* Object name */
240 int instance_no; /* Instance number of this object */
241 struct acpi_pnp_type type; /* ID type */
242 acpi_bus_address bus_address; /* _ADR */
243 char *unique_id; /* _UID */
244 struct list_head ids; /* _HID and _CIDs */
245 acpi_device_name device_name; /* Driver-determined */
246 acpi_device_class device_class; /* " */
247 union acpi_object *str_obj; /* unicode string for _STR method */
250 #define acpi_device_bid(d) ((d)->pnp.bus_id)
251 #define acpi_device_adr(d) ((d)->pnp.bus_address)
252 const char *acpi_device_hid(struct acpi_device *device);
253 #define acpi_device_uid(d) ((d)->pnp.unique_id)
254 #define acpi_device_name(d) ((d)->pnp.device_name)
255 #define acpi_device_class(d) ((d)->pnp.device_class)
257 /* Power Management */
259 struct acpi_device_power_flags {
260 u32 explicit_get:1; /* _PSC present? */
261 u32 power_resources:1; /* Power resources */
262 u32 inrush_current:1; /* Serialize Dx->D0 */
263 u32 power_removed:1; /* Optimize Dx->D0 */
264 u32 ignore_parent:1; /* Power is independent of parent power state */
265 u32 dsw_present:1; /* _DSW present? */
269 struct acpi_device_power_state {
272 u8 explicit_set:1; /* _PSx present? */
275 int power; /* % Power (compared to D0) */
276 int latency; /* Dx->D0 time (microseconds) */
277 struct list_head resources; /* Power resources referenced */
280 struct acpi_device_power {
281 int state; /* Current state */
282 struct acpi_device_power_flags flags;
283 struct acpi_device_power_state states[ACPI_D_STATE_COUNT]; /* Power states (D0-D3Cold) */
284 u8 state_for_enumeration; /* Deepest power state for enumeration */
287 struct acpi_dep_data {
288 struct list_head node;
289 acpi_handle supplier;
290 acpi_handle consumer;
294 /* Performance Management */
296 struct acpi_device_perf_flags {
300 struct acpi_device_perf_state {
305 u8 power; /* % Power (compared to P0) */
306 u8 performance; /* % Performance ( " ) */
307 int latency; /* Px->P0 time (microseconds) */
310 struct acpi_device_perf {
312 struct acpi_device_perf_flags flags;
314 struct acpi_device_perf_state *states;
317 /* Wakeup Management */
318 struct acpi_device_wakeup_flags {
319 u8 valid:1; /* Can successfully enable wakeup? */
320 u8 notifier_present:1; /* Wake-up notify handler has been installed */
323 struct acpi_device_wakeup_context {
324 void (*func)(struct acpi_device_wakeup_context *context);
328 struct acpi_device_wakeup {
329 acpi_handle gpe_device;
332 struct list_head resources;
333 struct acpi_device_wakeup_flags flags;
334 struct acpi_device_wakeup_context context;
335 struct wakeup_source *ws;
340 struct acpi_device_physical_node {
341 unsigned int node_id;
342 struct list_head node;
347 struct acpi_device_properties {
349 union acpi_object *properties;
350 struct list_head list;
354 /* ACPI Device Specific Data (_DSD) */
355 struct acpi_device_data {
356 const union acpi_object *pointer;
357 struct list_head properties;
358 const union acpi_object *of_compatible;
359 struct list_head subnodes;
362 struct acpi_gpio_mapping;
368 acpi_handle handle; /* no handle for fixed hardware */
369 struct fwnode_handle fwnode;
370 struct list_head wakeup_list;
371 struct list_head del_list;
372 struct acpi_device_status status;
373 struct acpi_device_flags flags;
374 struct acpi_device_pnp pnp;
375 struct acpi_device_power power;
376 struct acpi_device_wakeup wakeup;
377 struct acpi_device_perf performance;
378 struct acpi_device_dir dir;
379 struct acpi_device_data data;
380 struct acpi_scan_handler *handler;
381 struct acpi_hotplug_context *hp;
382 const struct acpi_gpio_mapping *driver_gpios;
385 unsigned int physical_node_count;
386 unsigned int dep_unmet;
387 struct list_head physical_node_list;
388 struct mutex physical_node_lock;
389 void (*remove)(struct acpi_device *);
392 /* Non-device subnode */
393 struct acpi_data_node {
396 struct fwnode_handle fwnode;
397 struct fwnode_handle *parent;
398 struct acpi_device_data data;
399 struct list_head sibling;
401 struct completion kobj_done;
404 extern const struct fwnode_operations acpi_device_fwnode_ops;
405 extern const struct fwnode_operations acpi_data_fwnode_ops;
406 extern const struct fwnode_operations acpi_static_fwnode_ops;
408 bool is_acpi_device_node(const struct fwnode_handle *fwnode);
409 bool is_acpi_data_node(const struct fwnode_handle *fwnode);
411 static inline bool is_acpi_node(const struct fwnode_handle *fwnode)
413 return (is_acpi_device_node(fwnode) || is_acpi_data_node(fwnode));
416 #define to_acpi_device_node(__fwnode) \
418 typeof(__fwnode) __to_acpi_device_node_fwnode = __fwnode; \
420 is_acpi_device_node(__to_acpi_device_node_fwnode) ? \
421 container_of(__to_acpi_device_node_fwnode, \
422 struct acpi_device, fwnode) : \
426 #define to_acpi_data_node(__fwnode) \
428 typeof(__fwnode) __to_acpi_data_node_fwnode = __fwnode; \
430 is_acpi_data_node(__to_acpi_data_node_fwnode) ? \
431 container_of(__to_acpi_data_node_fwnode, \
432 struct acpi_data_node, fwnode) : \
436 static inline bool is_acpi_static_node(const struct fwnode_handle *fwnode)
438 return !IS_ERR_OR_NULL(fwnode) &&
439 fwnode->ops == &acpi_static_fwnode_ops;
442 static inline bool acpi_data_node_match(const struct fwnode_handle *fwnode,
445 return is_acpi_data_node(fwnode) ?
446 (!strcmp(to_acpi_data_node(fwnode)->name, name)) : false;
449 static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
451 return &adev->fwnode;
454 static inline void *acpi_driver_data(struct acpi_device *d)
456 return d->driver_data;
459 #define to_acpi_device(d) container_of(d, struct acpi_device, dev)
460 #define to_acpi_driver(d) container_of(d, struct acpi_driver, drv)
462 static inline struct acpi_device *acpi_dev_parent(struct acpi_device *adev)
464 if (adev->dev.parent)
465 return to_acpi_device(adev->dev.parent);
470 static inline void acpi_set_device_status(struct acpi_device *adev, u32 sta)
472 *((u32 *)&adev->status) = sta;
475 static inline void acpi_set_hp_context(struct acpi_device *adev,
476 struct acpi_hotplug_context *hp)
482 void acpi_initialize_hp_context(struct acpi_device *adev,
483 struct acpi_hotplug_context *hp,
484 int (*notify)(struct acpi_device *, u32),
485 void (*uevent)(struct acpi_device *, u32));
487 /* acpi_device.dev.bus == &acpi_bus_type */
488 extern struct bus_type acpi_bus_type;
490 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data);
491 int acpi_dev_for_each_child(struct acpi_device *adev,
492 int (*fn)(struct acpi_device *, void *), void *data);
493 int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
494 int (*fn)(struct acpi_device *, void *),
502 struct acpi_bus_event {
503 struct list_head node;
504 acpi_device_class device_class;
510 extern struct kobject *acpi_kobj;
511 extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
512 void acpi_bus_private_data_handler(acpi_handle, void *);
513 int acpi_bus_get_private_data(acpi_handle, void **);
514 int acpi_bus_attach_private_data(acpi_handle, void *);
515 void acpi_bus_detach_private_data(acpi_handle);
516 extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
517 extern int register_acpi_notifier(struct notifier_block *);
518 extern int unregister_acpi_notifier(struct notifier_block *);
524 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
525 unsigned long long *sta);
526 int acpi_bus_get_status(struct acpi_device *device);
528 int acpi_bus_set_power(acpi_handle handle, int state);
529 const char *acpi_power_state_string(int state);
530 int acpi_device_set_power(struct acpi_device *device, int state);
531 int acpi_bus_init_power(struct acpi_device *device);
532 int acpi_device_fix_up_power(struct acpi_device *device);
533 void acpi_device_fix_up_power_extended(struct acpi_device *adev);
534 int acpi_bus_update_power(acpi_handle handle, int *state_p);
535 int acpi_device_update_power(struct acpi_device *device, int *state_p);
536 bool acpi_bus_power_manageable(acpi_handle handle);
537 void acpi_dev_power_up_children_with_adr(struct acpi_device *adev);
538 u8 acpi_dev_power_state_for_wake(struct acpi_device *adev);
539 int acpi_device_power_add_dependent(struct acpi_device *adev,
541 void acpi_device_power_remove_dependent(struct acpi_device *adev,
545 bool acpi_bus_can_wakeup(acpi_handle handle);
547 static inline bool acpi_bus_can_wakeup(acpi_handle handle) { return false; }
550 void acpi_scan_lock_acquire(void);
551 void acpi_scan_lock_release(void);
552 void acpi_lock_hp_context(void);
553 void acpi_unlock_hp_context(void);
554 int acpi_scan_add_handler(struct acpi_scan_handler *handler);
555 int acpi_bus_register_driver(struct acpi_driver *driver);
556 void acpi_bus_unregister_driver(struct acpi_driver *driver);
557 int acpi_bus_scan(acpi_handle handle);
558 void acpi_bus_trim(struct acpi_device *start);
559 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
560 int acpi_match_device_ids(struct acpi_device *device,
561 const struct acpi_device_id *ids);
562 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
563 char *modalias, size_t len);
564 int acpi_create_dir(struct acpi_device *);
565 void acpi_remove_dir(struct acpi_device *);
567 static inline bool acpi_device_enumerated(struct acpi_device *adev)
569 return adev && adev->flags.initialized && adev->flags.visited;
573 * module_acpi_driver(acpi_driver) - Helper macro for registering an ACPI driver
574 * @__acpi_driver: acpi_driver struct
576 * Helper macro for ACPI drivers which do not do anything special in module
577 * init/exit. This eliminates a lot of boilerplate. Each module may only
578 * use this macro once, and calling it replaces module_init() and module_exit()
580 #define module_acpi_driver(__acpi_driver) \
581 module_driver(__acpi_driver, acpi_bus_register_driver, \
582 acpi_bus_unregister_driver)
585 * Bind physical devices with ACPI devices
587 struct acpi_bus_type {
588 struct list_head list;
590 bool (*match)(struct device *dev);
591 struct acpi_device * (*find_companion)(struct device *);
592 void (*setup)(struct device *);
594 int register_acpi_bus_type(struct acpi_bus_type *);
595 int unregister_acpi_bus_type(struct acpi_bus_type *);
596 int acpi_bind_one(struct device *dev, struct acpi_device *adev);
597 int acpi_unbind_one(struct device *dev);
599 enum acpi_bridge_type {
600 ACPI_BRIDGE_TYPE_PCIE = 1,
601 ACPI_BRIDGE_TYPE_CXL,
604 struct acpi_pci_root {
605 struct acpi_device * device;
609 struct resource secondary; /* downstream bus range */
611 u32 osc_support_set; /* _OSC state of support bits */
612 u32 osc_control_set; /* _OSC state of control bits */
613 u32 osc_ext_support_set; /* _OSC state of extended support bits */
614 u32 osc_ext_control_set; /* _OSC state of extended control bits */
615 phys_addr_t mcfg_addr;
620 bool acpi_dma_supported(const struct acpi_device *adev);
621 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev);
622 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
623 struct fwnode_handle *fwnode,
624 const struct iommu_ops *ops);
625 int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map);
626 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
627 const u32 *input_id);
628 static inline int acpi_dma_configure(struct device *dev,
629 enum dev_dma_attr attr)
631 return acpi_dma_configure_id(dev, attr, NULL);
633 struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
634 u64 address, bool check_children);
635 struct acpi_device *acpi_find_child_by_adr(struct acpi_device *adev,
636 acpi_bus_address adr);
637 int acpi_is_root_bridge(acpi_handle);
638 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle);
640 int acpi_enable_wakeup_device_power(struct acpi_device *dev, int state);
641 int acpi_disable_wakeup_device_power(struct acpi_device *dev);
644 bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *status);
645 bool acpi_quirk_skip_acpi_ac_and_battery(void);
647 static inline bool acpi_device_override_status(struct acpi_device *adev,
648 unsigned long long *status)
652 static inline bool acpi_quirk_skip_acpi_ac_and_battery(void)
658 #if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
659 bool acpi_quirk_skip_i2c_client_enumeration(struct acpi_device *adev);
660 int acpi_quirk_skip_serdev_enumeration(struct device *controller_parent, bool *skip);
661 bool acpi_quirk_skip_gpio_event_handlers(void);
663 static inline bool acpi_quirk_skip_i2c_client_enumeration(struct acpi_device *adev)
668 acpi_quirk_skip_serdev_enumeration(struct device *controller_parent, bool *skip)
673 static inline bool acpi_quirk_skip_gpio_event_handlers(void)
680 void acpi_pm_wakeup_event(struct device *dev);
681 acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
682 void (*func)(struct acpi_device_wakeup_context *context));
683 acpi_status acpi_remove_pm_notifier(struct acpi_device *adev);
684 bool acpi_pm_device_can_wakeup(struct device *dev);
685 int acpi_pm_device_sleep_state(struct device *, int *, int);
686 int acpi_pm_set_device_wakeup(struct device *dev, bool enable);
688 static inline void acpi_pm_wakeup_event(struct device *dev)
691 static inline acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
693 void (*func)(struct acpi_device_wakeup_context *context))
697 static inline acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
701 static inline bool acpi_pm_device_can_wakeup(struct device *dev)
705 static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)
710 return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3_COLD) ?
713 static inline int acpi_pm_set_device_wakeup(struct device *dev, bool enable)
719 #ifdef CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT
720 bool acpi_sleep_state_supported(u8 sleep_state);
722 static inline bool acpi_sleep_state_supported(u8 sleep_state) { return false; }
725 #ifdef CONFIG_ACPI_SLEEP
726 u32 acpi_target_system_state(void);
728 static inline u32 acpi_target_system_state(void) { return ACPI_STATE_S0; }
731 static inline bool acpi_device_power_manageable(struct acpi_device *adev)
733 return adev->flags.power_manageable;
736 static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
738 return adev->wakeup.flags.valid;
741 static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
743 return adev->power.states[ACPI_STATE_D3_COLD].flags.valid ||
744 ((acpi_gbl_FADT.header.revision < 6) &&
745 adev->power.states[ACPI_STATE_D3_HOT].flags.explicit_set);
748 bool acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2);
749 int acpi_dev_uid_to_integer(struct acpi_device *adev, u64 *integer);
751 void acpi_dev_clear_dependencies(struct acpi_device *supplier);
752 bool acpi_dev_ready_for_enumeration(const struct acpi_device *device);
753 struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
754 struct acpi_device *start);
757 * for_each_acpi_consumer_dev - iterate over the consumer ACPI devices for a
759 * @supplier: Pointer to the supplier's ACPI device
760 * @consumer: Pointer to &struct acpi_device to hold the consumer, initially NULL
762 #define for_each_acpi_consumer_dev(supplier, consumer) \
763 for (consumer = acpi_dev_get_next_consumer_dev(supplier, NULL); \
765 consumer = acpi_dev_get_next_consumer_dev(supplier, consumer))
768 acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv);
770 acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv);
773 * for_each_acpi_dev_match - iterate over ACPI devices that matching the criteria
774 * @adev: pointer to the matching ACPI device, NULL at the end of the loop
775 * @hid: Hardware ID of the device.
776 * @uid: Unique ID of the device, pass NULL to not check _UID
777 * @hrv: Hardware Revision of the device, pass -1 to not check _HRV
779 * The caller is responsible for invoking acpi_dev_put() on the returned device.
781 #define for_each_acpi_dev_match(adev, hid, uid, hrv) \
782 for (adev = acpi_dev_get_first_match_dev(hid, uid, hrv); \
784 adev = acpi_dev_get_next_match_dev(adev, hid, uid, hrv))
786 static inline struct acpi_device *acpi_dev_get(struct acpi_device *adev)
788 return adev ? to_acpi_device(get_device(&adev->dev)) : NULL;
791 static inline void acpi_dev_put(struct acpi_device *adev)
794 put_device(&adev->dev);
797 struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle);
798 struct acpi_device *acpi_get_acpi_dev(acpi_handle handle);
800 static inline void acpi_put_acpi_dev(struct acpi_device *adev)
804 #else /* CONFIG_ACPI */
806 static inline int register_acpi_bus_type(void *bus) { return 0; }
807 static inline int unregister_acpi_bus_type(void *bus) { return 0; }
809 #endif /* CONFIG_ACPI */
811 #endif /*__ACPI_BUS_H__*/