include/acpi/acpi_bus.h

   1 /*
   2  *  acpi_bus.h - ACPI Bus Driver ($Revision: 22 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  20  */
  21
  22 #ifndef __ACPI_BUS_H__
  23 #define __ACPI_BUS_H__
  24
  25 #include <linux/device.h>
  26 #include <linux/property.h>
  27
  28 /* TBD: Make dynamic */
  29 #define ACPI_MAX_HANDLES        10
  30 struct acpi_handle_list {
  31         u32 count;
  32         acpi_handle handles[ACPI_MAX_HANDLES];
  33 };
  34
  35 /* acpi_utils.h */
  36 acpi_status
  37 acpi_extract_package(union acpi_object *package,
  38                      struct acpi_buffer *format, struct acpi_buffer *buffer);
  39 acpi_status
  40 acpi_evaluate_integer(acpi_handle handle,
  41                       acpi_string pathname,
  42                       struct acpi_object_list *arguments, unsigned long long *data);
  43 acpi_status
  44 acpi_evaluate_reference(acpi_handle handle,
  45                         acpi_string pathname,
  46                         struct acpi_object_list *arguments,
  47                         struct acpi_handle_list *list);
  48 acpi_status
  49 acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
  50                   struct acpi_buffer *status_buf);
  51
  52 acpi_status
  53 acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld);
  54
  55 bool acpi_has_method(acpi_handle handle, char *name);
  56 acpi_status acpi_execute_simple_method(acpi_handle handle, char *method,
  57                                        u64 arg);
  58 acpi_status acpi_evaluate_ej0(acpi_handle handle);
  59 acpi_status acpi_evaluate_lck(acpi_handle handle, int lock);
  60 bool acpi_ata_match(acpi_handle handle);
  61 bool acpi_bay_match(acpi_handle handle);
  62 bool acpi_dock_match(acpi_handle handle);
  63
  64 bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 funcs);
  65 union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid,
  66                         u64 rev, u64 func, union acpi_object *argv4);
  67
  68 static inline union acpi_object *
  69 acpi_evaluate_dsm_typed(acpi_handle handle, const u8 *uuid, u64 rev, u64 func,
  70                         union acpi_object *argv4, acpi_object_type type)
  71 {
  72         union acpi_object *obj;
  73
  74         obj = acpi_evaluate_dsm(handle, uuid, rev, func, argv4);
  75         if (obj && obj->type != type) {
  76                 ACPI_FREE(obj);
  77                 obj = NULL;
  78         }
  79
  80         return obj;
  81 }
  82
  83 #define ACPI_INIT_DSM_ARGV4(cnt, eles)                  \
  84         {                                               \
  85           .package.type = ACPI_TYPE_PACKAGE,            \
  86           .package.count = (cnt),                       \
  87           .package.elements = (eles)                    \
  88         }
  89
  90 bool acpi_dev_found(const char *hid);
  91
  92 #ifdef CONFIG_ACPI
  93
  94 #include <linux/proc_fs.h>
  95
  96 #define ACPI_BUS_FILE_ROOT      "acpi"
  97 extern struct proc_dir_entry *acpi_root_dir;
  98
  99 enum acpi_bus_device_type {
 100         ACPI_BUS_TYPE_DEVICE = 0,
 101         ACPI_BUS_TYPE_POWER,
 102         ACPI_BUS_TYPE_PROCESSOR,
 103         ACPI_BUS_TYPE_THERMAL,
 104         ACPI_BUS_TYPE_POWER_BUTTON,
 105         ACPI_BUS_TYPE_SLEEP_BUTTON,
 106         ACPI_BUS_DEVICE_TYPE_COUNT
 107 };
 108
 109 struct acpi_driver;
 110 struct acpi_device;
 111
 112 /*
 113  * ACPI Scan Handler
 114  * -----------------
 115  */
 116
 117 struct acpi_hotplug_profile {
 118         struct kobject kobj;
 119         int (*scan_dependent)(struct acpi_device *adev);
 120         void (*notify_online)(struct acpi_device *adev);
 121         bool enabled:1;
 122         bool demand_offline:1;
 123 };
 124
 125 static inline struct acpi_hotplug_profile *to_acpi_hotplug_profile(
 126                                                 struct kobject *kobj)
 127 {
 128         return container_of(kobj, struct acpi_hotplug_profile, kobj);
 129 }
 130
 131 struct acpi_scan_handler {
 132         const struct acpi_device_id *ids;
 133         struct list_head list_node;
 134         bool (*match)(const char *idstr, const struct acpi_device_id **matchid);
 135         int (*attach)(struct acpi_device *dev, const struct acpi_device_id *id);
 136         void (*detach)(struct acpi_device *dev);
 137         void (*bind)(struct device *phys_dev);
 138         void (*unbind)(struct device *phys_dev);
 139         struct acpi_hotplug_profile hotplug;
 140 };
 141
 142 /*
 143  * ACPI Hotplug Context
 144  * --------------------
 145  */
 146
 147 struct acpi_hotplug_context {
 148         struct acpi_device *self;
 149         int (*notify)(struct acpi_device *, u32);
 150         void (*uevent)(struct acpi_device *, u32);
 151         void (*fixup)(struct acpi_device *);
 152 };
 153
 154 /*
 155  * ACPI Driver
 156  * -----------
 157  */
 158
 159 typedef int (*acpi_op_add) (struct acpi_device * device);
 160 typedef int (*acpi_op_remove) (struct acpi_device * device);
 161 typedef void (*acpi_op_notify) (struct acpi_device * device, u32 event);
 162
 163 struct acpi_device_ops {
 164         acpi_op_add add;
 165         acpi_op_remove remove;
 166         acpi_op_notify notify;
 167 };
 168
 169 #define ACPI_DRIVER_ALL_NOTIFY_EVENTS   0x1     /* system AND device events */
 170
 171 struct acpi_driver {
 172         char name[80];
 173         char class[80];
 174         const struct acpi_device_id *ids; /* Supported Hardware IDs */
 175         unsigned int flags;
 176         struct acpi_device_ops ops;
 177         struct device_driver drv;
 178         struct module *owner;
 179 };
 180
 181 /*
 182  * ACPI Device
 183  * -----------
 184  */
 185
 186 /* Status (_STA) */
 187
 188 struct acpi_device_status {
 189         u32 present:1;
 190         u32 enabled:1;
 191         u32 show_in_ui:1;
 192         u32 functional:1;
 193         u32 battery_present:1;
 194         u32 reserved:27;
 195 };
 196
 197 /* Flags */
 198
 199 struct acpi_device_flags {
 200         u32 dynamic_status:1;
 201         u32 removable:1;
 202         u32 ejectable:1;
 203         u32 power_manageable:1;
 204         u32 match_driver:1;
 205         u32 initialized:1;
 206         u32 visited:1;
 207         u32 hotplug_notify:1;
 208         u32 is_dock_station:1;
 209         u32 of_compatible_ok:1;
 210         u32 coherent_dma:1;
 211         u32 cca_seen:1;
 212         u32 spi_i2c_slave:1;
 213         u32 reserved:19;
 214 };
 215
 216 /* File System */
 217
 218 struct acpi_device_dir {
 219         struct proc_dir_entry *entry;
 220 };
 221
 222 #define acpi_device_dir(d)      ((d)->dir.entry)
 223
 224 /* Plug and Play */
 225
 226 typedef char acpi_bus_id[8];
 227 typedef unsigned long acpi_bus_address;
 228 typedef char acpi_device_name[40];
 229 typedef char acpi_device_class[20];
 230
 231 struct acpi_hardware_id {
 232         struct list_head list;
 233         const char *id;
 234 };
 235
 236 struct acpi_pnp_type {
 237         u32 hardware_id:1;
 238         u32 bus_address:1;
 239         u32 platform_id:1;
 240         u32 reserved:29;
 241 };
 242
 243 struct acpi_device_pnp {
 244         acpi_bus_id bus_id;             /* Object name */
 245         struct acpi_pnp_type type;      /* ID type */
 246         acpi_bus_address bus_address;   /* _ADR */
 247         char *unique_id;                /* _UID */
 248         struct list_head ids;           /* _HID and _CIDs */
 249         acpi_device_name device_name;   /* Driver-determined */
 250         acpi_device_class device_class; /*        "          */
 251         union acpi_object *str_obj;     /* unicode string for _STR method */
 252 };
 253
 254 #define acpi_device_bid(d)      ((d)->pnp.bus_id)
 255 #define acpi_device_adr(d)      ((d)->pnp.bus_address)
 256 const char *acpi_device_hid(struct acpi_device *device);
 257 #define acpi_device_uid(d)      ((d)->pnp.unique_id)
 258 #define acpi_device_name(d)     ((d)->pnp.device_name)
 259 #define acpi_device_class(d)    ((d)->pnp.device_class)
 260
 261 /* Power Management */
 262
 263 struct acpi_device_power_flags {
 264         u32 explicit_get:1;     /* _PSC present? */
 265         u32 power_resources:1;  /* Power resources */
 266         u32 inrush_current:1;   /* Serialize Dx->D0 */
 267         u32 power_removed:1;    /* Optimize Dx->D0 */
 268         u32 ignore_parent:1;    /* Power is independent of parent power state */
 269         u32 dsw_present:1;      /* _DSW present? */
 270         u32 reserved:26;
 271 };
 272
 273 struct acpi_device_power_state {
 274         struct {
 275                 u8 valid:1;
 276                 u8 explicit_set:1;      /* _PSx present? */
 277                 u8 reserved:6;
 278         } flags;
 279         int power;              /* % Power (compared to D0) */
 280         int latency;            /* Dx->D0 time (microseconds) */
 281         struct list_head resources;     /* Power resources referenced */
 282 };
 283
 284 struct acpi_device_power {
 285         int state;              /* Current state */
 286         struct acpi_device_power_flags flags;
 287         struct acpi_device_power_state states[ACPI_D_STATE_COUNT];      /* Power states (D0-D3Cold) */
 288 };
 289
 290 /* Performance Management */
 291
 292 struct acpi_device_perf_flags {
 293         u8 reserved:8;
 294 };
 295
 296 struct acpi_device_perf_state {
 297         struct {
 298                 u8 valid:1;
 299                 u8 reserved:7;
 300         } flags;
 301         u8 power;               /* % Power (compared to P0) */
 302         u8 performance;         /* % Performance (    "   ) */
 303         int latency;            /* Px->P0 time (microseconds) */
 304 };
 305
 306 struct acpi_device_perf {
 307         int state;
 308         struct acpi_device_perf_flags flags;
 309         int state_count;
 310         struct acpi_device_perf_state *states;
 311 };
 312
 313 /* Wakeup Management */
 314 struct acpi_device_wakeup_flags {
 315         u8 valid:1;             /* Can successfully enable wakeup? */
 316         u8 run_wake:1;          /* Run-Wake GPE devices */
 317         u8 notifier_present:1;  /* Wake-up notify handler has been installed */
 318         u8 enabled:1;           /* Enabled for wakeup */
 319 };
 320
 321 struct acpi_device_wakeup_context {
 322         struct work_struct work;
 323         struct device *dev;
 324 };
 325
 326 struct acpi_device_wakeup {
 327         acpi_handle gpe_device;
 328         u64 gpe_number;
 329         u64 sleep_state;
 330         struct list_head resources;
 331         struct acpi_device_wakeup_flags flags;
 332         struct acpi_device_wakeup_context context;
 333         struct wakeup_source *ws;
 334         int prepare_count;
 335 };
 336
 337 struct acpi_device_physical_node {
 338         unsigned int node_id;
 339         struct list_head node;
 340         struct device *dev;
 341         bool put_online:1;
 342 };
 343
 344 /* ACPI Device Specific Data (_DSD) */
 345 struct acpi_device_data {
 346         const union acpi_object *pointer;
 347         const union acpi_object *properties;
 348         const union acpi_object *of_compatible;
 349         struct list_head subnodes;
 350 };
 351
 352 struct acpi_gpio_mapping;
 353
 354 /* Device */
 355 struct acpi_device {
 356         int device_type;
 357         acpi_handle handle;             /* no handle for fixed hardware */
 358         struct fwnode_handle fwnode;
 359         struct acpi_device *parent;
 360         struct list_head children;
 361         struct list_head node;
 362         struct list_head wakeup_list;
 363         struct list_head del_list;
 364         struct acpi_device_status status;
 365         struct acpi_device_flags flags;
 366         struct acpi_device_pnp pnp;
 367         struct acpi_device_power power;
 368         struct acpi_device_wakeup wakeup;
 369         struct acpi_device_perf performance;
 370         struct acpi_device_dir dir;
 371         struct acpi_device_data data;
 372         struct acpi_scan_handler *handler;
 373         struct acpi_hotplug_context *hp;
 374         struct acpi_driver *driver;
 375         const struct acpi_gpio_mapping *driver_gpios;
 376         void *driver_data;
 377         struct device dev;
 378         unsigned int physical_node_count;
 379         unsigned int dep_unmet;
 380         struct list_head physical_node_list;
 381         struct mutex physical_node_lock;
 382         void (*remove)(struct acpi_device *);
 383 };
 384
 385 /* Non-device subnode */
 386 struct acpi_data_node {
 387         const char *name;
 388         acpi_handle handle;
 389         struct fwnode_handle fwnode;
 390         struct acpi_device_data data;
 391         struct list_head sibling;
 392         struct kobject kobj;
 393         struct completion kobj_done;
 394 };
 395
 396 static inline bool is_acpi_node(struct fwnode_handle *fwnode)
 397 {
 398         return !IS_ERR_OR_NULL(fwnode) && (fwnode->type == FWNODE_ACPI
 399                 || fwnode->type == FWNODE_ACPI_DATA);
 400 }
 401
 402 static inline bool is_acpi_device_node(struct fwnode_handle *fwnode)
 403 {
 404         return !IS_ERR_OR_NULL(fwnode) && fwnode->type == FWNODE_ACPI;
 405 }
 406
 407 static inline struct acpi_device *to_acpi_device_node(struct fwnode_handle *fwnode)
 408 {
 409         return is_acpi_device_node(fwnode) ?
 410                 container_of(fwnode, struct acpi_device, fwnode) : NULL;
 411 }
 412
 413 static inline bool is_acpi_data_node(struct fwnode_handle *fwnode)
 414 {
 415         return fwnode && fwnode->type == FWNODE_ACPI_DATA;
 416 }
 417
 418 static inline struct acpi_data_node *to_acpi_data_node(struct fwnode_handle *fwnode)
 419 {
 420         return is_acpi_data_node(fwnode) ?
 421                 container_of(fwnode, struct acpi_data_node, fwnode) : NULL;
 422 }
 423
 424 static inline bool acpi_data_node_match(struct fwnode_handle *fwnode,
 425                                         const char *name)
 426 {
 427         return is_acpi_data_node(fwnode) ?
 428                 (!strcmp(to_acpi_data_node(fwnode)->name, name)) : false;
 429 }
 430
 431 static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
 432 {
 433         return &adev->fwnode;
 434 }
 435
 436 static inline void *acpi_driver_data(struct acpi_device *d)
 437 {
 438         return d->driver_data;
 439 }
 440
 441 #define to_acpi_device(d)       container_of(d, struct acpi_device, dev)
 442 #define to_acpi_driver(d)       container_of(d, struct acpi_driver, drv)
 443
 444 static inline void acpi_set_device_status(struct acpi_device *adev, u32 sta)
 445 {
 446         *((u32 *)&adev->status) = sta;
 447 }
 448
 449 static inline void acpi_set_hp_context(struct acpi_device *adev,
 450                                        struct acpi_hotplug_context *hp)
 451 {
 452         hp->self = adev;
 453         adev->hp = hp;
 454 }
 455
 456 void acpi_initialize_hp_context(struct acpi_device *adev,
 457                                 struct acpi_hotplug_context *hp,
 458                                 int (*notify)(struct acpi_device *, u32),
 459                                 void (*uevent)(struct acpi_device *, u32));
 460
 461 /* acpi_device.dev.bus == &acpi_bus_type */
 462 extern struct bus_type acpi_bus_type;
 463
 464 /*
 465  * Events
 466  * ------
 467  */
 468
 469 struct acpi_bus_event {
 470         struct list_head node;
 471         acpi_device_class device_class;
 472         acpi_bus_id bus_id;
 473         u32 type;
 474         u32 data;
 475 };
 476
 477 extern struct kobject *acpi_kobj;
 478 extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
 479 void acpi_bus_private_data_handler(acpi_handle, void *);
 480 int acpi_bus_get_private_data(acpi_handle, void **);
 481 int acpi_bus_attach_private_data(acpi_handle, void *);
 482 void acpi_bus_detach_private_data(acpi_handle);
 483 extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
 484 extern int register_acpi_notifier(struct notifier_block *);
 485 extern int unregister_acpi_notifier(struct notifier_block *);
 486
 487 /*
 488  * External Functions
 489  */
 490
 491 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device);
 492 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle);
 493 void acpi_bus_put_acpi_device(struct acpi_device *adev);
 494 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 495                                        unsigned long long *sta);
 496 int acpi_bus_get_status(struct acpi_device *device);
 497
 498 int acpi_bus_set_power(acpi_handle handle, int state);
 499 const char *acpi_power_state_string(int state);
 500 int acpi_device_get_power(struct acpi_device *device, int *state);
 501 int acpi_device_set_power(struct acpi_device *device, int state);
 502 int acpi_bus_init_power(struct acpi_device *device);
 503 int acpi_device_fix_up_power(struct acpi_device *device);
 504 int acpi_bus_update_power(acpi_handle handle, int *state_p);
 505 int acpi_device_update_power(struct acpi_device *device, int *state_p);
 506 bool acpi_bus_power_manageable(acpi_handle handle);
 507
 508 #ifdef CONFIG_PM
 509 bool acpi_bus_can_wakeup(acpi_handle handle);
 510 #else
 511 static inline bool acpi_bus_can_wakeup(acpi_handle handle) { return false; }
 512 #endif
 513
 514 void acpi_scan_lock_acquire(void);
 515 void acpi_scan_lock_release(void);
 516 void acpi_lock_hp_context(void);
 517 void acpi_unlock_hp_context(void);
 518 int acpi_scan_add_handler(struct acpi_scan_handler *handler);
 519 int acpi_bus_register_driver(struct acpi_driver *driver);
 520 void acpi_bus_unregister_driver(struct acpi_driver *driver);
 521 int acpi_bus_scan(acpi_handle handle);
 522 void acpi_bus_trim(struct acpi_device *start);
 523 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
 524 int acpi_match_device_ids(struct acpi_device *device,
 525                           const struct acpi_device_id *ids);
 526 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 527                        char *modalias, size_t len);
 528 int acpi_create_dir(struct acpi_device *);
 529 void acpi_remove_dir(struct acpi_device *);
 530
 531 static inline bool acpi_device_enumerated(struct acpi_device *adev)
 532 {
 533         return adev && adev->flags.initialized && adev->flags.visited;
 534 }
 535
 536 /**
 537  * module_acpi_driver(acpi_driver) - Helper macro for registering an ACPI driver
 538  * @__acpi_driver: acpi_driver struct
 539  *
 540  * Helper macro for ACPI drivers which do not do anything special in module
 541  * init/exit. This eliminates a lot of boilerplate. Each module may only
 542  * use this macro once, and calling it replaces module_init() and module_exit()
 543  */
 544 #define module_acpi_driver(__acpi_driver) \
 545         module_driver(__acpi_driver, acpi_bus_register_driver, \
 546                       acpi_bus_unregister_driver)
 547
 548 /*
 549  * Bind physical devices with ACPI devices
 550  */
 551 struct acpi_bus_type {
 552         struct list_head list;
 553         const char *name;
 554         bool (*match)(struct device *dev);
 555         struct acpi_device * (*find_companion)(struct device *);
 556         void (*setup)(struct device *);
 557         void (*cleanup)(struct device *);
 558 };
 559 int register_acpi_bus_type(struct acpi_bus_type *);
 560 int unregister_acpi_bus_type(struct acpi_bus_type *);
 561 int acpi_bind_one(struct device *dev, struct acpi_device *adev);
 562 int acpi_unbind_one(struct device *dev);
 563
 564 struct acpi_pci_root {
 565         struct acpi_device * device;
 566         struct pci_bus *bus;
 567         u16 segment;
 568         struct resource secondary;      /* downstream bus range */
 569
 570         u32 osc_support_set;    /* _OSC state of support bits */
 571         u32 osc_control_set;    /* _OSC state of control bits */
 572         phys_addr_t mcfg_addr;
 573 };
 574
 575 /* helper */
 576
 577 bool acpi_dma_supported(struct acpi_device *adev);
 578 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev);
 579 void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr);
 580 void acpi_dma_deconfigure(struct device *dev);
 581
 582 struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
 583                                            u64 address, bool check_children);
 584 int acpi_is_root_bridge(acpi_handle);
 585 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle);
 586
 587 int acpi_enable_wakeup_device_power(struct acpi_device *dev, int state);
 588 int acpi_disable_wakeup_device_power(struct acpi_device *dev);
 589
 590 #ifdef CONFIG_PM
 591 acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
 592                                  void (*work_func)(struct work_struct *work));
 593 acpi_status acpi_remove_pm_notifier(struct acpi_device *adev);
 594 int acpi_pm_device_sleep_state(struct device *, int *, int);
 595 int acpi_pm_device_run_wake(struct device *, bool);
 596 #else
 597 static inline acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
 598                                                struct device *dev,
 599                                                void (*work_func)(struct work_struct *work))
 600 {
 601         return AE_SUPPORT;
 602 }
 603 static inline acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
 604 {
 605         return AE_SUPPORT;
 606 }
 607 static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)
 608 {
 609         if (p)
 610                 *p = ACPI_STATE_D0;
 611
 612         return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3_COLD) ?
 613                 m : ACPI_STATE_D0;
 614 }
 615 static inline int acpi_pm_device_run_wake(struct device *dev, bool enable)
 616 {
 617         return -ENODEV;
 618 }
 619 #endif
 620
 621 #ifdef CONFIG_PM_SLEEP
 622 int acpi_pm_device_sleep_wake(struct device *, bool);
 623 #else
 624 static inline int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 625 {
 626         return -ENODEV;
 627 }
 628 #endif
 629
 630 #ifdef CONFIG_ACPI_SLEEP
 631 u32 acpi_target_system_state(void);
 632 #else
 633 static inline u32 acpi_target_system_state(void) { return ACPI_STATE_S0; }
 634 #endif
 635
 636 static inline bool acpi_device_power_manageable(struct acpi_device *adev)
 637 {
 638         return adev->flags.power_manageable;
 639 }
 640
 641 static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
 642 {
 643         return adev->wakeup.flags.valid;
 644 }
 645
 646 static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
 647 {
 648         return adev->power.states[ACPI_STATE_D3_COLD].flags.valid ||
 649                 ((acpi_gbl_FADT.header.revision < 6) &&
 650                 adev->power.states[ACPI_STATE_D3_HOT].flags.explicit_set);
 651 }
 652
 653 #else   /* CONFIG_ACPI */
 654
 655 static inline int register_acpi_bus_type(void *bus) { return 0; }
 656 static inline int unregister_acpi_bus_type(void *bus) { return 0; }
 657
 658 #endif                          /* CONFIG_ACPI */
 659
 660 #endif /*__ACPI_BUS_H__*/