xref: /openbmc/linux/include/acpi/acpi_bus.h (revision 96ac6d43)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  *  acpi_bus.h - ACPI Bus Driver ($Revision: 22 $)
4  *
5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7  */
8 
9 #ifndef __ACPI_BUS_H__
10 #define __ACPI_BUS_H__
11 
12 #include <linux/device.h>
13 #include <linux/property.h>
14 
15 /* TBD: Make dynamic */
16 #define ACPI_MAX_HANDLES	10
17 struct acpi_handle_list {
18 	u32 count;
19 	acpi_handle handles[ACPI_MAX_HANDLES];
20 };
21 
22 /* acpi_utils.h */
23 acpi_status
24 acpi_extract_package(union acpi_object *package,
25 		     struct acpi_buffer *format, struct acpi_buffer *buffer);
26 acpi_status
27 acpi_evaluate_integer(acpi_handle handle,
28 		      acpi_string pathname,
29 		      struct acpi_object_list *arguments, unsigned long long *data);
30 acpi_status
31 acpi_evaluate_reference(acpi_handle handle,
32 			acpi_string pathname,
33 			struct acpi_object_list *arguments,
34 			struct acpi_handle_list *list);
35 acpi_status
36 acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
37 		  struct acpi_buffer *status_buf);
38 
39 acpi_status
40 acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld);
41 
42 bool acpi_has_method(acpi_handle handle, char *name);
43 acpi_status acpi_execute_simple_method(acpi_handle handle, char *method,
44 				       u64 arg);
45 acpi_status acpi_evaluate_ej0(acpi_handle handle);
46 acpi_status acpi_evaluate_lck(acpi_handle handle, int lock);
47 bool acpi_ata_match(acpi_handle handle);
48 bool acpi_bay_match(acpi_handle handle);
49 bool acpi_dock_match(acpi_handle handle);
50 
51 bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs);
52 union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid,
53 			u64 rev, u64 func, union acpi_object *argv4);
54 
55 static inline union acpi_object *
56 acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *guid, u64 rev,
57 			u64 func, union acpi_object *argv4,
58 			acpi_object_type type)
59 {
60 	union acpi_object *obj;
61 
62 	obj = acpi_evaluate_dsm(handle, guid, rev, func, argv4);
63 	if (obj && obj->type != type) {
64 		ACPI_FREE(obj);
65 		obj = NULL;
66 	}
67 
68 	return obj;
69 }
70 
71 #define	ACPI_INIT_DSM_ARGV4(cnt, eles)			\
72 	{						\
73 	  .package.type = ACPI_TYPE_PACKAGE,		\
74 	  .package.count = (cnt),			\
75 	  .package.elements = (eles)			\
76 	}
77 
78 bool acpi_dev_found(const char *hid);
79 bool acpi_dev_present(const char *hid, const char *uid, s64 hrv);
80 
81 struct acpi_device *
82 acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv);
83 
84 #ifdef CONFIG_ACPI
85 
86 #include <linux/proc_fs.h>
87 
88 #define ACPI_BUS_FILE_ROOT	"acpi"
89 extern struct proc_dir_entry *acpi_root_dir;
90 
91 enum acpi_bus_device_type {
92 	ACPI_BUS_TYPE_DEVICE = 0,
93 	ACPI_BUS_TYPE_POWER,
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
100 };
101 
102 struct acpi_driver;
103 struct acpi_device;
104 
105 /*
106  * ACPI Scan Handler
107  * -----------------
108  */
109 
110 struct acpi_hotplug_profile {
111 	struct kobject kobj;
112 	int (*scan_dependent)(struct acpi_device *adev);
113 	void (*notify_online)(struct acpi_device *adev);
114 	bool enabled:1;
115 	bool demand_offline:1;
116 };
117 
118 static inline struct acpi_hotplug_profile *to_acpi_hotplug_profile(
119 						struct kobject *kobj)
120 {
121 	return container_of(kobj, struct acpi_hotplug_profile, kobj);
122 }
123 
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;
133 };
134 
135 /*
136  * ACPI Hotplug Context
137  * --------------------
138  */
139 
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 *);
145 };
146 
147 /*
148  * ACPI Driver
149  * -----------
150  */
151 
152 typedef int (*acpi_op_add) (struct acpi_device * device);
153 typedef int (*acpi_op_remove) (struct acpi_device * device);
154 typedef void (*acpi_op_notify) (struct acpi_device * device, u32 event);
155 
156 struct acpi_device_ops {
157 	acpi_op_add add;
158 	acpi_op_remove remove;
159 	acpi_op_notify notify;
160 };
161 
162 #define ACPI_DRIVER_ALL_NOTIFY_EVENTS	0x1	/* system AND device events */
163 
164 struct acpi_driver {
165 	char name[80];
166 	char class[80];
167 	const struct acpi_device_id *ids; /* Supported Hardware IDs */
168 	unsigned int flags;
169 	struct acpi_device_ops ops;
170 	struct device_driver drv;
171 	struct module *owner;
172 };
173 
174 /*
175  * ACPI Device
176  * -----------
177  */
178 
179 /* Status (_STA) */
180 
181 struct acpi_device_status {
182 	u32 present:1;
183 	u32 enabled:1;
184 	u32 show_in_ui:1;
185 	u32 functional:1;
186 	u32 battery_present:1;
187 	u32 reserved:27;
188 };
189 
190 /* Flags */
191 
192 struct acpi_device_flags {
193 	u32 dynamic_status:1;
194 	u32 removable:1;
195 	u32 ejectable:1;
196 	u32 power_manageable:1;
197 	u32 match_driver:1;
198 	u32 initialized:1;
199 	u32 visited:1;
200 	u32 hotplug_notify:1;
201 	u32 is_dock_station:1;
202 	u32 of_compatible_ok:1;
203 	u32 coherent_dma:1;
204 	u32 cca_seen:1;
205 	u32 enumeration_by_parent:1;
206 	u32 reserved:19;
207 };
208 
209 /* File System */
210 
211 struct acpi_device_dir {
212 	struct proc_dir_entry *entry;
213 };
214 
215 #define acpi_device_dir(d)	((d)->dir.entry)
216 
217 /* Plug and Play */
218 
219 typedef char acpi_bus_id[8];
220 typedef u64 acpi_bus_address;
221 typedef char acpi_device_name[40];
222 typedef char acpi_device_class[20];
223 
224 struct acpi_hardware_id {
225 	struct list_head list;
226 	const char *id;
227 };
228 
229 struct acpi_pnp_type {
230 	u32 hardware_id:1;
231 	u32 bus_address:1;
232 	u32 platform_id:1;
233 	u32 reserved:29;
234 };
235 
236 struct acpi_device_pnp {
237 	acpi_bus_id bus_id;		/* Object name */
238 	struct acpi_pnp_type type;	/* ID type */
239 	acpi_bus_address bus_address;	/* _ADR */
240 	char *unique_id;		/* _UID */
241 	struct list_head ids;		/* _HID and _CIDs */
242 	acpi_device_name device_name;	/* Driver-determined */
243 	acpi_device_class device_class;	/*        "          */
244 	union acpi_object *str_obj;	/* unicode string for _STR method */
245 };
246 
247 #define acpi_device_bid(d)	((d)->pnp.bus_id)
248 #define acpi_device_adr(d)	((d)->pnp.bus_address)
249 const char *acpi_device_hid(struct acpi_device *device);
250 #define acpi_device_uid(d)	((d)->pnp.unique_id)
251 #define acpi_device_name(d)	((d)->pnp.device_name)
252 #define acpi_device_class(d)	((d)->pnp.device_class)
253 
254 /* Power Management */
255 
256 struct acpi_device_power_flags {
257 	u32 explicit_get:1;	/* _PSC present? */
258 	u32 power_resources:1;	/* Power resources */
259 	u32 inrush_current:1;	/* Serialize Dx->D0 */
260 	u32 power_removed:1;	/* Optimize Dx->D0 */
261 	u32 ignore_parent:1;	/* Power is independent of parent power state */
262 	u32 dsw_present:1;	/* _DSW present? */
263 	u32 reserved:26;
264 };
265 
266 struct acpi_device_power_state {
267 	struct {
268 		u8 valid:1;
269 		u8 explicit_set:1;	/* _PSx present? */
270 		u8 reserved:6;
271 	} flags;
272 	int power;		/* % Power (compared to D0) */
273 	int latency;		/* Dx->D0 time (microseconds) */
274 	struct list_head resources;	/* Power resources referenced */
275 };
276 
277 struct acpi_device_power {
278 	int state;		/* Current state */
279 	struct acpi_device_power_flags flags;
280 	struct acpi_device_power_state states[ACPI_D_STATE_COUNT];	/* Power states (D0-D3Cold) */
281 };
282 
283 /* Performance Management */
284 
285 struct acpi_device_perf_flags {
286 	u8 reserved:8;
287 };
288 
289 struct acpi_device_perf_state {
290 	struct {
291 		u8 valid:1;
292 		u8 reserved:7;
293 	} flags;
294 	u8 power;		/* % Power (compared to P0) */
295 	u8 performance;		/* % Performance (    "   ) */
296 	int latency;		/* Px->P0 time (microseconds) */
297 };
298 
299 struct acpi_device_perf {
300 	int state;
301 	struct acpi_device_perf_flags flags;
302 	int state_count;
303 	struct acpi_device_perf_state *states;
304 };
305 
306 /* Wakeup Management */
307 struct acpi_device_wakeup_flags {
308 	u8 valid:1;		/* Can successfully enable wakeup? */
309 	u8 notifier_present:1;  /* Wake-up notify handler has been installed */
310 };
311 
312 struct acpi_device_wakeup_context {
313 	void (*func)(struct acpi_device_wakeup_context *context);
314 	struct device *dev;
315 };
316 
317 struct acpi_device_wakeup {
318 	acpi_handle gpe_device;
319 	u64 gpe_number;
320 	u64 sleep_state;
321 	struct list_head resources;
322 	struct acpi_device_wakeup_flags flags;
323 	struct acpi_device_wakeup_context context;
324 	struct wakeup_source *ws;
325 	int prepare_count;
326 	int enable_count;
327 };
328 
329 struct acpi_device_physical_node {
330 	unsigned int node_id;
331 	struct list_head node;
332 	struct device *dev;
333 	bool put_online:1;
334 };
335 
336 struct acpi_device_properties {
337 	const guid_t *guid;
338 	const union acpi_object *properties;
339 	struct list_head list;
340 };
341 
342 /* ACPI Device Specific Data (_DSD) */
343 struct acpi_device_data {
344 	const union acpi_object *pointer;
345 	struct list_head properties;
346 	const union acpi_object *of_compatible;
347 	struct list_head subnodes;
348 };
349 
350 struct acpi_gpio_mapping;
351 
352 /* Device */
353 struct acpi_device {
354 	int device_type;
355 	acpi_handle handle;		/* no handle for fixed hardware */
356 	struct fwnode_handle fwnode;
357 	struct acpi_device *parent;
358 	struct list_head children;
359 	struct list_head node;
360 	struct list_head wakeup_list;
361 	struct list_head del_list;
362 	struct acpi_device_status status;
363 	struct acpi_device_flags flags;
364 	struct acpi_device_pnp pnp;
365 	struct acpi_device_power power;
366 	struct acpi_device_wakeup wakeup;
367 	struct acpi_device_perf performance;
368 	struct acpi_device_dir dir;
369 	struct acpi_device_data data;
370 	struct acpi_scan_handler *handler;
371 	struct acpi_hotplug_context *hp;
372 	struct acpi_driver *driver;
373 	const struct acpi_gpio_mapping *driver_gpios;
374 	void *driver_data;
375 	struct device dev;
376 	unsigned int physical_node_count;
377 	unsigned int dep_unmet;
378 	struct list_head physical_node_list;
379 	struct mutex physical_node_lock;
380 	void (*remove)(struct acpi_device *);
381 };
382 
383 /* Non-device subnode */
384 struct acpi_data_node {
385 	const char *name;
386 	acpi_handle handle;
387 	struct fwnode_handle fwnode;
388 	struct fwnode_handle *parent;
389 	struct acpi_device_data data;
390 	struct list_head sibling;
391 	struct kobject kobj;
392 	struct completion kobj_done;
393 };
394 
395 extern const struct fwnode_operations acpi_device_fwnode_ops;
396 extern const struct fwnode_operations acpi_data_fwnode_ops;
397 extern const struct fwnode_operations acpi_static_fwnode_ops;
398 
399 bool is_acpi_device_node(const struct fwnode_handle *fwnode);
400 bool is_acpi_data_node(const struct fwnode_handle *fwnode);
401 
402 static inline bool is_acpi_node(const struct fwnode_handle *fwnode)
403 {
404 	return (is_acpi_device_node(fwnode) || is_acpi_data_node(fwnode));
405 }
406 
407 #define to_acpi_device_node(__fwnode)					\
408 	({								\
409 		typeof(__fwnode) __to_acpi_device_node_fwnode = __fwnode; \
410 									\
411 		is_acpi_device_node(__to_acpi_device_node_fwnode) ?	\
412 			container_of(__to_acpi_device_node_fwnode,	\
413 				     struct acpi_device, fwnode) :	\
414 			NULL;						\
415 	})
416 
417 #define to_acpi_data_node(__fwnode)					\
418 	({								\
419 		typeof(__fwnode) __to_acpi_data_node_fwnode = __fwnode;	\
420 									\
421 		is_acpi_data_node(__to_acpi_data_node_fwnode) ?		\
422 			container_of(__to_acpi_data_node_fwnode,	\
423 				     struct acpi_data_node, fwnode) :	\
424 			NULL;						\
425 	})
426 
427 static inline bool is_acpi_static_node(const struct fwnode_handle *fwnode)
428 {
429 	return !IS_ERR_OR_NULL(fwnode) &&
430 		fwnode->ops == &acpi_static_fwnode_ops;
431 }
432 
433 static inline bool acpi_data_node_match(const struct fwnode_handle *fwnode,
434 					const char *name)
435 {
436 	return is_acpi_data_node(fwnode) ?
437 		(!strcmp(to_acpi_data_node(fwnode)->name, name)) : false;
438 }
439 
440 static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
441 {
442 	return &adev->fwnode;
443 }
444 
445 static inline void *acpi_driver_data(struct acpi_device *d)
446 {
447 	return d->driver_data;
448 }
449 
450 #define to_acpi_device(d)	container_of(d, struct acpi_device, dev)
451 #define to_acpi_driver(d)	container_of(d, struct acpi_driver, drv)
452 
453 static inline void acpi_set_device_status(struct acpi_device *adev, u32 sta)
454 {
455 	*((u32 *)&adev->status) = sta;
456 }
457 
458 static inline void acpi_set_hp_context(struct acpi_device *adev,
459 				       struct acpi_hotplug_context *hp)
460 {
461 	hp->self = adev;
462 	adev->hp = hp;
463 }
464 
465 void acpi_initialize_hp_context(struct acpi_device *adev,
466 				struct acpi_hotplug_context *hp,
467 				int (*notify)(struct acpi_device *, u32),
468 				void (*uevent)(struct acpi_device *, u32));
469 
470 /* acpi_device.dev.bus == &acpi_bus_type */
471 extern struct bus_type acpi_bus_type;
472 
473 /*
474  * Events
475  * ------
476  */
477 
478 struct acpi_bus_event {
479 	struct list_head node;
480 	acpi_device_class device_class;
481 	acpi_bus_id bus_id;
482 	u32 type;
483 	u32 data;
484 };
485 
486 extern struct kobject *acpi_kobj;
487 extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
488 void acpi_bus_private_data_handler(acpi_handle, void *);
489 int acpi_bus_get_private_data(acpi_handle, void **);
490 int acpi_bus_attach_private_data(acpi_handle, void *);
491 void acpi_bus_detach_private_data(acpi_handle);
492 extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
493 extern int register_acpi_notifier(struct notifier_block *);
494 extern int unregister_acpi_notifier(struct notifier_block *);
495 
496 /*
497  * External Functions
498  */
499 
500 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device);
501 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle);
502 void acpi_bus_put_acpi_device(struct acpi_device *adev);
503 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
504 				       unsigned long long *sta);
505 int acpi_bus_get_status(struct acpi_device *device);
506 
507 int acpi_bus_set_power(acpi_handle handle, int state);
508 const char *acpi_power_state_string(int state);
509 int acpi_device_get_power(struct acpi_device *device, int *state);
510 int acpi_device_set_power(struct acpi_device *device, int state);
511 int acpi_bus_init_power(struct acpi_device *device);
512 int acpi_device_fix_up_power(struct acpi_device *device);
513 int acpi_bus_update_power(acpi_handle handle, int *state_p);
514 int acpi_device_update_power(struct acpi_device *device, int *state_p);
515 bool acpi_bus_power_manageable(acpi_handle handle);
516 
517 #ifdef CONFIG_PM
518 bool acpi_bus_can_wakeup(acpi_handle handle);
519 #else
520 static inline bool acpi_bus_can_wakeup(acpi_handle handle) { return false; }
521 #endif
522 
523 void acpi_scan_lock_acquire(void);
524 void acpi_scan_lock_release(void);
525 void acpi_lock_hp_context(void);
526 void acpi_unlock_hp_context(void);
527 int acpi_scan_add_handler(struct acpi_scan_handler *handler);
528 int acpi_bus_register_driver(struct acpi_driver *driver);
529 void acpi_bus_unregister_driver(struct acpi_driver *driver);
530 int acpi_bus_scan(acpi_handle handle);
531 void acpi_bus_trim(struct acpi_device *start);
532 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
533 int acpi_match_device_ids(struct acpi_device *device,
534 			  const struct acpi_device_id *ids);
535 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
536 		       char *modalias, size_t len);
537 int acpi_create_dir(struct acpi_device *);
538 void acpi_remove_dir(struct acpi_device *);
539 
540 static inline bool acpi_device_enumerated(struct acpi_device *adev)
541 {
542 	return adev && adev->flags.initialized && adev->flags.visited;
543 }
544 
545 /**
546  * module_acpi_driver(acpi_driver) - Helper macro for registering an ACPI driver
547  * @__acpi_driver: acpi_driver struct
548  *
549  * Helper macro for ACPI drivers which do not do anything special in module
550  * init/exit. This eliminates a lot of boilerplate. Each module may only
551  * use this macro once, and calling it replaces module_init() and module_exit()
552  */
553 #define module_acpi_driver(__acpi_driver) \
554 	module_driver(__acpi_driver, acpi_bus_register_driver, \
555 		      acpi_bus_unregister_driver)
556 
557 /*
558  * Bind physical devices with ACPI devices
559  */
560 struct acpi_bus_type {
561 	struct list_head list;
562 	const char *name;
563 	bool (*match)(struct device *dev);
564 	struct acpi_device * (*find_companion)(struct device *);
565 	void (*setup)(struct device *);
566 	void (*cleanup)(struct device *);
567 };
568 int register_acpi_bus_type(struct acpi_bus_type *);
569 int unregister_acpi_bus_type(struct acpi_bus_type *);
570 int acpi_bind_one(struct device *dev, struct acpi_device *adev);
571 int acpi_unbind_one(struct device *dev);
572 
573 struct acpi_pci_root {
574 	struct acpi_device * device;
575 	struct pci_bus *bus;
576 	u16 segment;
577 	struct resource secondary;	/* downstream bus range */
578 
579 	u32 osc_support_set;	/* _OSC state of support bits */
580 	u32 osc_control_set;	/* _OSC state of control bits */
581 	phys_addr_t mcfg_addr;
582 };
583 
584 /* helper */
585 
586 bool acpi_dma_supported(struct acpi_device *adev);
587 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev);
588 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
589 		       u64 *size);
590 int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr);
591 
592 struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
593 					   u64 address, bool check_children);
594 int acpi_is_root_bridge(acpi_handle);
595 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle);
596 
597 int acpi_enable_wakeup_device_power(struct acpi_device *dev, int state);
598 int acpi_disable_wakeup_device_power(struct acpi_device *dev);
599 
600 #ifdef CONFIG_X86
601 bool acpi_device_always_present(struct acpi_device *adev);
602 #else
603 static inline bool acpi_device_always_present(struct acpi_device *adev)
604 {
605 	return false;
606 }
607 #endif
608 
609 #ifdef CONFIG_PM
610 void acpi_pm_wakeup_event(struct device *dev);
611 acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
612 			void (*func)(struct acpi_device_wakeup_context *context));
613 acpi_status acpi_remove_pm_notifier(struct acpi_device *adev);
614 bool acpi_pm_device_can_wakeup(struct device *dev);
615 int acpi_pm_device_sleep_state(struct device *, int *, int);
616 int acpi_pm_set_device_wakeup(struct device *dev, bool enable);
617 int acpi_pm_set_bridge_wakeup(struct device *dev, bool enable);
618 #else
619 static inline void acpi_pm_wakeup_event(struct device *dev)
620 {
621 }
622 static inline acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
623 					       struct device *dev,
624 					       void (*func)(struct acpi_device_wakeup_context *context))
625 {
626 	return AE_SUPPORT;
627 }
628 static inline acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
629 {
630 	return AE_SUPPORT;
631 }
632 static inline bool acpi_pm_device_can_wakeup(struct device *dev)
633 {
634 	return false;
635 }
636 static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)
637 {
638 	if (p)
639 		*p = ACPI_STATE_D0;
640 
641 	return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3_COLD) ?
642 		m : ACPI_STATE_D0;
643 }
644 static inline int acpi_pm_set_device_wakeup(struct device *dev, bool enable)
645 {
646 	return -ENODEV;
647 }
648 static inline int acpi_pm_set_bridge_wakeup(struct device *dev, bool enable)
649 {
650 	return -ENODEV;
651 }
652 #endif
653 
654 #ifdef CONFIG_ACPI_SLEEP
655 u32 acpi_target_system_state(void);
656 #else
657 static inline u32 acpi_target_system_state(void) { return ACPI_STATE_S0; }
658 #endif
659 
660 static inline bool acpi_device_power_manageable(struct acpi_device *adev)
661 {
662 	return adev->flags.power_manageable;
663 }
664 
665 static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
666 {
667 	return adev->wakeup.flags.valid;
668 }
669 
670 static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
671 {
672 	return adev->power.states[ACPI_STATE_D3_COLD].flags.valid ||
673 		((acpi_gbl_FADT.header.revision < 6) &&
674 		adev->power.states[ACPI_STATE_D3_HOT].flags.explicit_set);
675 }
676 
677 static inline void acpi_dev_put(struct acpi_device *adev)
678 {
679 	put_device(&adev->dev);
680 }
681 #else	/* CONFIG_ACPI */
682 
683 static inline int register_acpi_bus_type(void *bus) { return 0; }
684 static inline int unregister_acpi_bus_type(void *bus) { return 0; }
685 
686 #endif				/* CONFIG_ACPI */
687 
688 #endif /*__ACPI_BUS_H__*/
689