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 reserved:20;
 213 };
 214
 215 /* File System */
 216
 217 struct acpi_device_dir {
 218         struct proc_dir_entry *entry;
 219 };
 220
 221 #define acpi_device_dir(d)      ((d)->dir.entry)
 222
 223 /* Plug and Play */
 224
 225 typedef char acpi_bus_id[8];
 226 typedef unsigned long acpi_bus_address;
 227 typedef char acpi_device_name[40];
 228 typedef char acpi_device_class[20];
 229
 230 struct acpi_hardware_id {
 231         struct list_head list;
 232         const char *id;
 233 };
 234
 235 struct acpi_pnp_type {
 236         u32 hardware_id:1;
 237         u32 bus_address:1;
 238         u32 platform_id:1;
 239         u32 reserved:29;
 240 };
 241
 242 struct acpi_device_pnp {
 243         acpi_bus_id bus_id;             /* Object name */
 244         struct acpi_pnp_type type;      /* ID type */
 245         acpi_bus_address bus_address;   /* _ADR */
 246         char *unique_id;                /* _UID */
 247         struct list_head ids;           /* _HID and _CIDs */
 248         acpi_device_name device_name;   /* Driver-determined */
 249         acpi_device_class device_class; /*        "          */
 250         union acpi_object *str_obj;     /* unicode string for _STR method */
 251 };
 252
 253 #define acpi_device_bid(d)      ((d)->pnp.bus_id)
 254 #define acpi_device_adr(d)      ((d)->pnp.bus_address)
 255 const char *acpi_device_hid(struct acpi_device *device);
 256 #define acpi_device_uid(d)      ((d)->pnp.unique_id)
 257 #define acpi_device_name(d)     ((d)->pnp.device_name)
 258 #define acpi_device_class(d)    ((d)->pnp.device_class)
 259
 260 /* Power Management */
 261
 262 struct acpi_device_power_flags {
 263         u32 explicit_get:1;     /* _PSC present? */
 264         u32 power_resources:1;  /* Power resources */
 265         u32 inrush_current:1;   /* Serialize Dx->D0 */
 266         u32 power_removed:1;    /* Optimize Dx->D0 */
 267         u32 ignore_parent:1;    /* Power is independent of parent power state */
 268         u32 dsw_present:1;      /* _DSW present? */
 269         u32 reserved:26;
 270 };
 271
 272 struct acpi_device_power_state {
 273         struct {
 274                 u8 valid:1;
 275                 u8 explicit_set:1;      /* _PSx present? */
 276                 u8 reserved:6;
 277         } flags;
 278         int power;              /* % Power (compared to D0) */
 279         int latency;            /* Dx->D0 time (microseconds) */
 280         struct list_head resources;     /* Power resources referenced */
 281 };
 282
 283 struct acpi_device_power {
 284         int state;              /* Current state */
 285         struct acpi_device_power_flags flags;
 286         struct acpi_device_power_state states[ACPI_D_STATE_COUNT];      /* Power states (D0-D3Cold) */
 287 };
 288
 289 /* Performance Management */
 290
 291 struct acpi_device_perf_flags {
 292         u8 reserved:8;
 293 };
 294
 295 struct acpi_device_perf_state {
 296         struct {
 297                 u8 valid:1;
 298                 u8 reserved:7;
 299         } flags;
 300         u8 power;               /* % Power (compared to P0) */
 301         u8 performance;         /* % Performance (    "   ) */
 302         int latency;            /* Px->P0 time (microseconds) */
 303 };
 304
 305 struct acpi_device_perf {
 306         int state;
 307         struct acpi_device_perf_flags flags;
 308         int state_count;
 309         struct acpi_device_perf_state *states;
 310 };
 311
 312 /* Wakeup Management */
 313 struct acpi_device_wakeup_flags {
 314         u8 valid:1;             /* Can successfully enable wakeup? */
 315         u8 run_wake:1;          /* Run-Wake GPE devices */
 316         u8 notifier_present:1;  /* Wake-up notify handler has been installed */
 317         u8 enabled:1;           /* Enabled for wakeup */
 318 };
 319
 320 struct acpi_device_wakeup_context {
 321         struct work_struct work;
 322         struct device *dev;
 323 };
 324
 325 struct acpi_device_wakeup {
 326         acpi_handle gpe_device;
 327         u64 gpe_number;
 328         u64 sleep_state;
 329         struct list_head resources;
 330         struct acpi_device_wakeup_flags flags;
 331         struct acpi_device_wakeup_context context;
 332         struct wakeup_source *ws;
 333         int prepare_count;
 334 };
 335
 336 struct acpi_device_physical_node {
 337         unsigned int node_id;
 338         struct list_head node;
 339         struct device *dev;
 340         bool put_online:1;
 341 };
 342
 343 /* ACPI Device Specific Data (_DSD) */
 344 struct acpi_device_data {
 345         const union acpi_object *pointer;
 346         const union acpi_object *properties;
 347         const union acpi_object *of_compatible;
 348         struct list_head subnodes;
 349 };
 350
 351 struct acpi_gpio_mapping;
 352
 353 /* Device */
 354 struct acpi_device {
 355         int device_type;
 356         acpi_handle handle;             /* no handle for fixed hardware */
 357         struct fwnode_handle fwnode;
 358         struct acpi_device *parent;
 359         struct list_head children;
 360         struct list_head node;
 361         struct list_head wakeup_list;
 362         struct list_head del_list;
 363         struct acpi_device_status status;
 364         struct acpi_device_flags flags;
 365         struct acpi_device_pnp pnp;
 366         struct acpi_device_power power;
 367         struct acpi_device_wakeup wakeup;
 368         struct acpi_device_perf performance;
 369         struct acpi_device_dir dir;
 370         struct acpi_device_data data;
 371         struct acpi_scan_handler *handler;
 372         struct acpi_hotplug_context *hp;
 373         struct acpi_driver *driver;
 374         const struct acpi_gpio_mapping *driver_gpios;
 375         void *driver_data;
 376         struct device dev;
 377         unsigned int physical_node_count;
 378         unsigned int dep_unmet;
 379         struct list_head physical_node_list;
 380         struct mutex physical_node_lock;
 381         void (*remove)(struct acpi_device *);
 382 };
 383
 384 /* Non-device subnode */
 385 struct acpi_data_node {
 386         const char *name;
 387         acpi_handle handle;
 388         struct fwnode_handle fwnode;
 389         struct acpi_device_data data;
 390         struct list_head sibling;
 391         struct kobject kobj;
 392         struct completion kobj_done;
 393 };
 394
 395 static inline bool is_acpi_node(struct fwnode_handle *fwnode)
 396 {
 397         return !IS_ERR_OR_NULL(fwnode) && (fwnode->type == FWNODE_ACPI
 398                 || fwnode->type == FWNODE_ACPI_DATA);
 399 }
 400
 401 static inline bool is_acpi_device_node(struct fwnode_handle *fwnode)
 402 {
 403         return !IS_ERR_OR_NULL(fwnode) && fwnode->type == FWNODE_ACPI;
 404 }
 405
 406 static inline struct acpi_device *to_acpi_device_node(struct fwnode_handle *fwnode)
 407 {
 408         return is_acpi_device_node(fwnode) ?
 409                 container_of(fwnode, struct acpi_device, fwnode) : NULL;
 410 }
 411
 412 static inline bool is_acpi_data_node(struct fwnode_handle *fwnode)
 413 {
 414         return fwnode && fwnode->type == FWNODE_ACPI_DATA;
 415 }
 416
 417 static inline struct acpi_data_node *to_acpi_data_node(struct fwnode_handle *fwnode)
 418 {
 419         return is_acpi_data_node(fwnode) ?
 420                 container_of(fwnode, struct acpi_data_node, fwnode) : NULL;
 421 }
 422
 423 static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
 424 {
 425         return &adev->fwnode;
 426 }
 427
 428 static inline void *acpi_driver_data(struct acpi_device *d)
 429 {
 430         return d->driver_data;
 431 }
 432
 433 #define to_acpi_device(d)       container_of(d, struct acpi_device, dev)
 434 #define to_acpi_driver(d)       container_of(d, struct acpi_driver, drv)
 435
 436 static inline void acpi_set_device_status(struct acpi_device *adev, u32 sta)
 437 {
 438         *((u32 *)&adev->status) = sta;
 439 }
 440
 441 static inline void acpi_set_hp_context(struct acpi_device *adev,
 442                                        struct acpi_hotplug_context *hp)
 443 {
 444         hp->self = adev;
 445         adev->hp = hp;
 446 }
 447
 448 void acpi_initialize_hp_context(struct acpi_device *adev,
 449                                 struct acpi_hotplug_context *hp,
 450                                 int (*notify)(struct acpi_device *, u32),
 451                                 void (*uevent)(struct acpi_device *, u32));
 452
 453 /* acpi_device.dev.bus == &acpi_bus_type */
 454 extern struct bus_type acpi_bus_type;
 455
 456 /*
 457  * Events
 458  * ------
 459  */
 460
 461 struct acpi_bus_event {
 462         struct list_head node;
 463         acpi_device_class device_class;
 464         acpi_bus_id bus_id;
 465         u32 type;
 466         u32 data;
 467 };
 468
 469 extern struct kobject *acpi_kobj;
 470 extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
 471 void acpi_bus_private_data_handler(acpi_handle, void *);
 472 int acpi_bus_get_private_data(acpi_handle, void **);
 473 int acpi_bus_attach_private_data(acpi_handle, void *);
 474 void acpi_bus_detach_private_data(acpi_handle);
 475 extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
 476 extern int register_acpi_notifier(struct notifier_block *);
 477 extern int unregister_acpi_notifier(struct notifier_block *);
 478
 479 /*
 480  * External Functions
 481  */
 482
 483 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device);
 484 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle);
 485 void acpi_bus_put_acpi_device(struct acpi_device *adev);
 486 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 487                                        unsigned long long *sta);
 488 int acpi_bus_get_status(struct acpi_device *device);
 489
 490 int acpi_bus_set_power(acpi_handle handle, int state);
 491 const char *acpi_power_state_string(int state);
 492 int acpi_device_get_power(struct acpi_device *device, int *state);
 493 int acpi_device_set_power(struct acpi_device *device, int state);
 494 int acpi_bus_init_power(struct acpi_device *device);
 495 int acpi_device_fix_up_power(struct acpi_device *device);
 496 int acpi_bus_update_power(acpi_handle handle, int *state_p);
 497 int acpi_device_update_power(struct acpi_device *device, int *state_p);
 498 bool acpi_bus_power_manageable(acpi_handle handle);
 499
 500 #ifdef CONFIG_PM
 501 bool acpi_bus_can_wakeup(acpi_handle handle);
 502 #else
 503 static inline bool acpi_bus_can_wakeup(acpi_handle handle) { return false; }
 504 #endif
 505
 506 void acpi_scan_lock_acquire(void);
 507 void acpi_scan_lock_release(void);
 508 void acpi_lock_hp_context(void);
 509 void acpi_unlock_hp_context(void);
 510 int acpi_scan_add_handler(struct acpi_scan_handler *handler);
 511 int acpi_bus_register_driver(struct acpi_driver *driver);
 512 void acpi_bus_unregister_driver(struct acpi_driver *driver);
 513 int acpi_bus_scan(acpi_handle handle);
 514 void acpi_bus_trim(struct acpi_device *start);
 515 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
 516 int acpi_match_device_ids(struct acpi_device *device,
 517                           const struct acpi_device_id *ids);
 518 int acpi_create_dir(struct acpi_device *);
 519 void acpi_remove_dir(struct acpi_device *);
 520
 521 static inline bool acpi_device_enumerated(struct acpi_device *adev)
 522 {
 523         return adev && adev->flags.initialized && adev->flags.visited;
 524 }
 525
 526 /**
 527  * module_acpi_driver(acpi_driver) - Helper macro for registering an ACPI driver
 528  * @__acpi_driver: acpi_driver struct
 529  *
 530  * Helper macro for ACPI drivers which do not do anything special in module
 531  * init/exit. This eliminates a lot of boilerplate. Each module may only
 532  * use this macro once, and calling it replaces module_init() and module_exit()
 533  */
 534 #define module_acpi_driver(__acpi_driver) \
 535         module_driver(__acpi_driver, acpi_bus_register_driver, \
 536                       acpi_bus_unregister_driver)
 537
 538 /*
 539  * Bind physical devices with ACPI devices
 540  */
 541 struct acpi_bus_type {
 542         struct list_head list;
 543         const char *name;
 544         bool (*match)(struct device *dev);
 545         struct acpi_device * (*find_companion)(struct device *);
 546         void (*setup)(struct device *);
 547         void (*cleanup)(struct device *);
 548 };
 549 int register_acpi_bus_type(struct acpi_bus_type *);
 550 int unregister_acpi_bus_type(struct acpi_bus_type *);
 551 int acpi_bind_one(struct device *dev, struct acpi_device *adev);
 552 int acpi_unbind_one(struct device *dev);
 553
 554 struct acpi_pci_root {
 555         struct acpi_device * device;
 556         struct pci_bus *bus;
 557         u16 segment;
 558         struct resource secondary;      /* downstream bus range */
 559
 560         u32 osc_support_set;    /* _OSC state of support bits */
 561         u32 osc_control_set;    /* _OSC state of control bits */
 562         phys_addr_t mcfg_addr;
 563 };
 564
 565 /* helper */
 566
 567 bool acpi_dma_supported(struct acpi_device *adev);
 568 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev);
 569
 570 struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
 571                                            u64 address, bool check_children);
 572 int acpi_is_root_bridge(acpi_handle);
 573 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle);
 574
 575 int acpi_enable_wakeup_device_power(struct acpi_device *dev, int state);
 576 int acpi_disable_wakeup_device_power(struct acpi_device *dev);
 577
 578 #ifdef CONFIG_PM
 579 acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
 580                                  void (*work_func)(struct work_struct *work));
 581 acpi_status acpi_remove_pm_notifier(struct acpi_device *adev);
 582 int acpi_pm_device_sleep_state(struct device *, int *, int);
 583 int acpi_pm_device_run_wake(struct device *, bool);
 584 #else
 585 static inline acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
 586                                                struct device *dev,
 587                                                void (*work_func)(struct work_struct *work))
 588 {
 589         return AE_SUPPORT;
 590 }
 591 static inline acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
 592 {
 593         return AE_SUPPORT;
 594 }
 595 static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)
 596 {
 597         if (p)
 598                 *p = ACPI_STATE_D0;
 599
 600         return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3_COLD) ?
 601                 m : ACPI_STATE_D0;
 602 }
 603 static inline int acpi_pm_device_run_wake(struct device *dev, bool enable)
 604 {
 605         return -ENODEV;
 606 }
 607 #endif
 608
 609 #ifdef CONFIG_PM_SLEEP
 610 int acpi_pm_device_sleep_wake(struct device *, bool);
 611 #else
 612 static inline int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 613 {
 614         return -ENODEV;
 615 }
 616 #endif
 617
 618 #ifdef CONFIG_ACPI_SLEEP
 619 u32 acpi_target_system_state(void);
 620 #else
 621 static inline u32 acpi_target_system_state(void) { return ACPI_STATE_S0; }
 622 #endif
 623
 624 static inline bool acpi_device_power_manageable(struct acpi_device *adev)
 625 {
 626         return adev->flags.power_manageable;
 627 }
 628
 629 static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
 630 {
 631         return adev->wakeup.flags.valid;
 632 }
 633
 634 static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
 635 {
 636         return adev->power.states[ACPI_STATE_D3_COLD].flags.valid ||
 637                 ((acpi_gbl_FADT.header.revision < 6) &&
 638                 adev->power.states[ACPI_STATE_D3_HOT].flags.explicit_set);
 639 }
 640
 641 #else   /* CONFIG_ACPI */
 642
 643 static inline int register_acpi_bus_type(void *bus) { return 0; }
 644 static inline int unregister_acpi_bus_type(void *bus) { return 0; }
 645
 646 #endif                          /* CONFIG_ACPI */
 647
 648 #endif /*__ACPI_BUS_H__*/