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  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #ifndef __ACPI_BUS_H__
  27 #define __ACPI_BUS_H__
  28
  29 #include <linux/device.h>
  30 #include <linux/property.h>
  31
  32 /* TBD: Make dynamic */
  33 #define ACPI_MAX_HANDLES        10
  34 struct acpi_handle_list {
  35         u32 count;
  36         acpi_handle handles[ACPI_MAX_HANDLES];
  37 };
  38
  39 /* acpi_utils.h */
  40 acpi_status
  41 acpi_extract_package(union acpi_object *package,
  42                      struct acpi_buffer *format, struct acpi_buffer *buffer);
  43 acpi_status
  44 acpi_evaluate_integer(acpi_handle handle,
  45                       acpi_string pathname,
  46                       struct acpi_object_list *arguments, unsigned long long *data);
  47 acpi_status
  48 acpi_evaluate_reference(acpi_handle handle,
  49                         acpi_string pathname,
  50                         struct acpi_object_list *arguments,
  51                         struct acpi_handle_list *list);
  52 acpi_status
  53 acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
  54                   struct acpi_buffer *status_buf);
  55
  56 acpi_status
  57 acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld);
  58
  59 bool acpi_has_method(acpi_handle handle, char *name);
  60 acpi_status acpi_execute_simple_method(acpi_handle handle, char *method,
  61                                        u64 arg);
  62 acpi_status acpi_evaluate_ej0(acpi_handle handle);
  63 acpi_status acpi_evaluate_lck(acpi_handle handle, int lock);
  64 bool acpi_ata_match(acpi_handle handle);
  65 bool acpi_bay_match(acpi_handle handle);
  66 bool acpi_dock_match(acpi_handle handle);
  67
  68 bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs);
  69 union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid,
  70                         int rev, int func, union acpi_object *argv4);
  71
  72 static inline union acpi_object *
  73 acpi_evaluate_dsm_typed(acpi_handle handle, const u8 *uuid, int rev, int func,
  74                         union acpi_object *argv4, acpi_object_type type)
  75 {
  76         union acpi_object *obj;
  77
  78         obj = acpi_evaluate_dsm(handle, uuid, rev, func, argv4);
  79         if (obj && obj->type != type) {
  80                 ACPI_FREE(obj);
  81                 obj = NULL;
  82         }
  83
  84         return obj;
  85 }
  86
  87 #define ACPI_INIT_DSM_ARGV4(cnt, eles)                  \
  88         {                                               \
  89           .package.type = ACPI_TYPE_PACKAGE,            \
  90           .package.count = (cnt),                       \
  91           .package.elements = (eles)                    \
  92         }
  93
  94 #ifdef CONFIG_ACPI
  95
  96 #include <linux/proc_fs.h>
  97
  98 #define ACPI_BUS_FILE_ROOT      "acpi"
  99 extern struct proc_dir_entry *acpi_root_dir;
 100
 101 enum acpi_bus_device_type {
 102         ACPI_BUS_TYPE_DEVICE = 0,
 103         ACPI_BUS_TYPE_POWER,
 104         ACPI_BUS_TYPE_PROCESSOR,
 105         ACPI_BUS_TYPE_THERMAL,
 106         ACPI_BUS_TYPE_POWER_BUTTON,
 107         ACPI_BUS_TYPE_SLEEP_BUTTON,
 108         ACPI_BUS_DEVICE_TYPE_COUNT
 109 };
 110
 111 struct acpi_driver;
 112 struct acpi_device;
 113
 114 /*
 115  * ACPI Scan Handler
 116  * -----------------
 117  */
 118
 119 struct acpi_hotplug_profile {
 120         struct kobject kobj;
 121         int (*scan_dependent)(struct acpi_device *adev);
 122         void (*notify_online)(struct acpi_device *adev);
 123         bool enabled:1;
 124         bool demand_offline:1;
 125 };
 126
 127 static inline struct acpi_hotplug_profile *to_acpi_hotplug_profile(
 128                                                 struct kobject *kobj)
 129 {
 130         return container_of(kobj, struct acpi_hotplug_profile, kobj);
 131 }
 132
 133 struct acpi_scan_handler {
 134         const struct acpi_device_id *ids;
 135         struct list_head list_node;
 136         bool (*match)(char *idstr, const struct acpi_device_id **matchid);
 137         int (*attach)(struct acpi_device *dev, const struct acpi_device_id *id);
 138         void (*detach)(struct acpi_device *dev);
 139         void (*bind)(struct device *phys_dev);
 140         void (*unbind)(struct device *phys_dev);
 141         struct acpi_hotplug_profile hotplug;
 142 };
 143
 144 /*
 145  * ACPI Hotplug Context
 146  * --------------------
 147  */
 148
 149 struct acpi_hotplug_context {
 150         struct acpi_device *self;
 151         int (*notify)(struct acpi_device *, u32);
 152         void (*uevent)(struct acpi_device *, u32);
 153         void (*fixup)(struct acpi_device *);
 154 };
 155
 156 /*
 157  * ACPI Driver
 158  * -----------
 159  */
 160
 161 typedef int (*acpi_op_add) (struct acpi_device * device);
 162 typedef int (*acpi_op_remove) (struct acpi_device * device);
 163 typedef void (*acpi_op_notify) (struct acpi_device * device, u32 event);
 164
 165 struct acpi_device_ops {
 166         acpi_op_add add;
 167         acpi_op_remove remove;
 168         acpi_op_notify notify;
 169 };
 170
 171 #define ACPI_DRIVER_ALL_NOTIFY_EVENTS   0x1     /* system AND device events */
 172
 173 struct acpi_driver {
 174         char name[80];
 175         char class[80];
 176         const struct acpi_device_id *ids; /* Supported Hardware IDs */
 177         unsigned int flags;
 178         struct acpi_device_ops ops;
 179         struct device_driver drv;
 180         struct module *owner;
 181 };
 182
 183 /*
 184  * ACPI Device
 185  * -----------
 186  */
 187
 188 /* Status (_STA) */
 189
 190 struct acpi_device_status {
 191         u32 present:1;
 192         u32 enabled:1;
 193         u32 show_in_ui:1;
 194         u32 functional:1;
 195         u32 battery_present:1;
 196         u32 reserved:27;
 197 };
 198
 199 /* Flags */
 200
 201 struct acpi_device_flags {
 202         u32 dynamic_status:1;
 203         u32 removable:1;
 204         u32 ejectable:1;
 205         u32 power_manageable:1;
 206         u32 match_driver:1;
 207         u32 initialized:1;
 208         u32 visited:1;
 209         u32 hotplug_notify:1;
 210         u32 is_dock_station:1;
 211         u32 of_compatible_ok:1;
 212         u32 coherent_dma:1;
 213         u32 cca_seen:1;
 214         u32 reserved:20;
 215 };
 216
 217 /* File System */
 218
 219 struct acpi_device_dir {
 220         struct proc_dir_entry *entry;
 221 };
 222
 223 #define acpi_device_dir(d)      ((d)->dir.entry)
 224
 225 /* Plug and Play */
 226
 227 typedef char acpi_bus_id[8];
 228 typedef unsigned long acpi_bus_address;
 229 typedef char acpi_device_name[40];
 230 typedef char acpi_device_class[20];
 231
 232 struct acpi_hardware_id {
 233         struct list_head list;
 234         char *id;
 235 };
 236
 237 struct acpi_pnp_type {
 238         u32 hardware_id:1;
 239         u32 bus_address:1;
 240         u32 platform_id:1;
 241         u32 reserved:29;
 242 };
 243
 244 struct acpi_device_pnp {
 245         acpi_bus_id bus_id;             /* Object name */
 246         struct acpi_pnp_type type;      /* ID type */
 247         acpi_bus_address bus_address;   /* _ADR */
 248         char *unique_id;                /* _UID */
 249         struct list_head ids;           /* _HID and _CIDs */
 250         acpi_device_name device_name;   /* Driver-determined */
 251         acpi_device_class device_class; /*        "          */
 252         union acpi_object *str_obj;     /* unicode string for _STR method */
 253 };
 254
 255 #define acpi_device_bid(d)      ((d)->pnp.bus_id)
 256 #define acpi_device_adr(d)      ((d)->pnp.bus_address)
 257 const char *acpi_device_hid(struct acpi_device *device);
 258 #define acpi_device_uid(d)      ((d)->pnp.unique_id)
 259 #define acpi_device_name(d)     ((d)->pnp.device_name)
 260 #define acpi_device_class(d)    ((d)->pnp.device_class)
 261
 262 /* Power Management */
 263
 264 struct acpi_device_power_flags {
 265         u32 explicit_get:1;     /* _PSC present? */
 266         u32 power_resources:1;  /* Power resources */
 267         u32 inrush_current:1;   /* Serialize Dx->D0 */
 268         u32 power_removed:1;    /* Optimize Dx->D0 */
 269         u32 ignore_parent:1;    /* Power is independent of parent power state */
 270         u32 dsw_present:1;      /* _DSW present? */
 271         u32 reserved:26;
 272 };
 273
 274 struct acpi_device_power_state {
 275         struct {
 276                 u8 valid:1;
 277                 u8 explicit_set:1;      /* _PSx present? */
 278                 u8 reserved:6;
 279         } flags;
 280         int power;              /* % Power (compared to D0) */
 281         int latency;            /* Dx->D0 time (microseconds) */
 282         struct list_head resources;     /* Power resources referenced */
 283 };
 284
 285 struct acpi_device_power {
 286         int state;              /* Current state */
 287         struct acpi_device_power_flags flags;
 288         struct acpi_device_power_state states[ACPI_D_STATE_COUNT];      /* Power states (D0-D3Cold) */
 289 };
 290
 291 /* Performance Management */
 292
 293 struct acpi_device_perf_flags {
 294         u8 reserved:8;
 295 };
 296
 297 struct acpi_device_perf_state {
 298         struct {
 299                 u8 valid:1;
 300                 u8 reserved:7;
 301         } flags;
 302         u8 power;               /* % Power (compared to P0) */
 303         u8 performance;         /* % Performance (    "   ) */
 304         int latency;            /* Px->P0 time (microseconds) */
 305 };
 306
 307 struct acpi_device_perf {
 308         int state;
 309         struct acpi_device_perf_flags flags;
 310         int state_count;
 311         struct acpi_device_perf_state *states;
 312 };
 313
 314 /* Wakeup Management */
 315 struct acpi_device_wakeup_flags {
 316         u8 valid:1;             /* Can successfully enable wakeup? */
 317         u8 run_wake:1;          /* Run-Wake GPE devices */
 318         u8 notifier_present:1;  /* Wake-up notify handler has been installed */
 319         u8 enabled:1;           /* Enabled for wakeup */
 320 };
 321
 322 struct acpi_device_wakeup_context {
 323         struct work_struct work;
 324         struct device *dev;
 325 };
 326
 327 struct acpi_device_wakeup {
 328         acpi_handle gpe_device;
 329         u64 gpe_number;
 330         u64 sleep_state;
 331         struct list_head resources;
 332         struct acpi_device_wakeup_flags flags;
 333         struct acpi_device_wakeup_context context;
 334         struct wakeup_source *ws;
 335         int prepare_count;
 336 };
 337
 338 struct acpi_device_physical_node {
 339         unsigned int node_id;
 340         struct list_head node;
 341         struct device *dev;
 342         bool put_online:1;
 343 };
 344
 345 /* ACPI Device Specific Data (_DSD) */
 346 struct acpi_device_data {
 347         const union acpi_object *pointer;
 348         const union acpi_object *properties;
 349         const union acpi_object *of_compatible;
 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 static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent)
 386 {
 387         bool ret = false;
 388
 389         if (!adev)
 390                 return ret;
 391
 392         /**
 393          * Currently, we only support _CCA=1 (i.e. coherent_dma=1)
 394          * This should be equivalent to specifyig dma-coherent for
 395          * a device in OF.
 396          *
 397          * For the case when _CCA=0 (i.e. coherent_dma=0 && cca_seen=1),
 398          * There are two cases:
 399          * case 1. Do not support and disable DMA.
 400          * case 2. Support but rely on arch-specific cache maintenance for
 401          *         non-coherence DMA operations.
 402          * Currently, we implement case 1 above.
 403          *
 404          * For the case when _CCA is missing (i.e. cca_seen=0) and
 405          * platform specifies ACPI_CCA_REQUIRED, we do not support DMA,
 406          * and fallback to arch-specific default handling.
 407          *
 408          * See acpi_init_coherency() for more info.
 409          */
 410         if (adev->flags.coherent_dma) {
 411                 ret = true;
 412                 if (coherent)
 413                         *coherent = adev->flags.coherent_dma;
 414         }
 415         return ret;
 416 }
 417
 418 static inline bool is_acpi_node(struct fwnode_handle *fwnode)
 419 {
 420         return fwnode && fwnode->type == FWNODE_ACPI;
 421 }
 422
 423 static inline struct acpi_device *to_acpi_node(struct fwnode_handle *fwnode)
 424 {
 425         return is_acpi_node(fwnode) ?
 426                 container_of(fwnode, struct acpi_device, fwnode) : NULL;
 427 }
 428
 429 static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
 430 {
 431         return &adev->fwnode;
 432 }
 433
 434 static inline void *acpi_driver_data(struct acpi_device *d)
 435 {
 436         return d->driver_data;
 437 }
 438
 439 #define to_acpi_device(d)       container_of(d, struct acpi_device, dev)
 440 #define to_acpi_driver(d)       container_of(d, struct acpi_driver, drv)
 441
 442 static inline void acpi_set_device_status(struct acpi_device *adev, u32 sta)
 443 {
 444         *((u32 *)&adev->status) = sta;
 445 }
 446
 447 static inline void acpi_set_hp_context(struct acpi_device *adev,
 448                                        struct acpi_hotplug_context *hp)
 449 {
 450         hp->self = adev;
 451         adev->hp = hp;
 452 }
 453
 454 void acpi_initialize_hp_context(struct acpi_device *adev,
 455                                 struct acpi_hotplug_context *hp,
 456                                 int (*notify)(struct acpi_device *, u32),
 457                                 void (*uevent)(struct acpi_device *, u32));
 458
 459 /* acpi_device.dev.bus == &acpi_bus_type */
 460 extern struct bus_type acpi_bus_type;
 461
 462 /*
 463  * Events
 464  * ------
 465  */
 466
 467 struct acpi_bus_event {
 468         struct list_head node;
 469         acpi_device_class device_class;
 470         acpi_bus_id bus_id;
 471         u32 type;
 472         u32 data;
 473 };
 474
 475 extern struct kobject *acpi_kobj;
 476 extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
 477 void acpi_bus_private_data_handler(acpi_handle, void *);
 478 int acpi_bus_get_private_data(acpi_handle, void **);
 479 int acpi_bus_attach_private_data(acpi_handle, void *);
 480 void acpi_bus_detach_private_data(acpi_handle);
 481 extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
 482 extern int register_acpi_notifier(struct notifier_block *);
 483 extern int unregister_acpi_notifier(struct notifier_block *);
 484
 485 /*
 486  * External Functions
 487  */
 488
 489 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device);
 490 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle);
 491 void acpi_bus_put_acpi_device(struct acpi_device *adev);
 492 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 493                                        unsigned long long *sta);
 494 int acpi_bus_get_status(struct acpi_device *device);
 495
 496 int acpi_bus_set_power(acpi_handle handle, int state);
 497 const char *acpi_power_state_string(int state);
 498 int acpi_device_get_power(struct acpi_device *device, int *state);
 499 int acpi_device_set_power(struct acpi_device *device, int state);
 500 int acpi_bus_init_power(struct acpi_device *device);
 501 int acpi_device_fix_up_power(struct acpi_device *device);
 502 int acpi_bus_update_power(acpi_handle handle, int *state_p);
 503 int acpi_device_update_power(struct acpi_device *device, int *state_p);
 504 bool acpi_bus_power_manageable(acpi_handle handle);
 505
 506 #ifdef CONFIG_PM
 507 bool acpi_bus_can_wakeup(acpi_handle handle);
 508 #else
 509 static inline bool acpi_bus_can_wakeup(acpi_handle handle) { return false; }
 510 #endif
 511
 512 void acpi_scan_lock_acquire(void);
 513 void acpi_scan_lock_release(void);
 514 void acpi_lock_hp_context(void);
 515 void acpi_unlock_hp_context(void);
 516 int acpi_scan_add_handler(struct acpi_scan_handler *handler);
 517 int acpi_bus_register_driver(struct acpi_driver *driver);
 518 void acpi_bus_unregister_driver(struct acpi_driver *driver);
 519 int acpi_bus_scan(acpi_handle handle);
 520 void acpi_bus_trim(struct acpi_device *start);
 521 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
 522 int acpi_match_device_ids(struct acpi_device *device,
 523                           const struct acpi_device_id *ids);
 524 int acpi_create_dir(struct acpi_device *);
 525 void acpi_remove_dir(struct acpi_device *);
 526
 527 static inline bool acpi_device_enumerated(struct acpi_device *adev)
 528 {
 529         return adev && adev->flags.initialized && adev->flags.visited;
 530 }
 531
 532 /**
 533  * module_acpi_driver(acpi_driver) - Helper macro for registering an ACPI driver
 534  * @__acpi_driver: acpi_driver struct
 535  *
 536  * Helper macro for ACPI drivers which do not do anything special in module
 537  * init/exit. This eliminates a lot of boilerplate. Each module may only
 538  * use this macro once, and calling it replaces module_init() and module_exit()
 539  */
 540 #define module_acpi_driver(__acpi_driver) \
 541         module_driver(__acpi_driver, acpi_bus_register_driver, \
 542                       acpi_bus_unregister_driver)
 543
 544 /*
 545  * Bind physical devices with ACPI devices
 546  */
 547 struct acpi_bus_type {
 548         struct list_head list;
 549         const char *name;
 550         bool (*match)(struct device *dev);
 551         struct acpi_device * (*find_companion)(struct device *);
 552         void (*setup)(struct device *);
 553         void (*cleanup)(struct device *);
 554 };
 555 int register_acpi_bus_type(struct acpi_bus_type *);
 556 int unregister_acpi_bus_type(struct acpi_bus_type *);
 557 int acpi_bind_one(struct device *dev, struct acpi_device *adev);
 558 int acpi_unbind_one(struct device *dev);
 559
 560 struct acpi_pci_root {
 561         struct acpi_device * device;
 562         struct pci_bus *bus;
 563         u16 segment;
 564         struct resource secondary;      /* downstream bus range */
 565
 566         u32 osc_support_set;    /* _OSC state of support bits */
 567         u32 osc_control_set;    /* _OSC state of control bits */
 568         phys_addr_t mcfg_addr;
 569 };
 570
 571 /* helper */
 572
 573 struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
 574                                            u64 address, bool check_children);
 575 int acpi_is_root_bridge(acpi_handle);
 576 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle);
 577
 578 int acpi_enable_wakeup_device_power(struct acpi_device *dev, int state);
 579 int acpi_disable_wakeup_device_power(struct acpi_device *dev);
 580
 581 #ifdef CONFIG_PM
 582 acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
 583                                  void (*work_func)(struct work_struct *work));
 584 acpi_status acpi_remove_pm_notifier(struct acpi_device *adev);
 585 int acpi_pm_device_sleep_state(struct device *, int *, int);
 586 int acpi_pm_device_run_wake(struct device *, bool);
 587 #else
 588 static inline acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
 589                                                struct device *dev,
 590                                                void (*work_func)(struct work_struct *work))
 591 {
 592         return AE_SUPPORT;
 593 }
 594 static inline acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
 595 {
 596         return AE_SUPPORT;
 597 }
 598 static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)
 599 {
 600         if (p)
 601                 *p = ACPI_STATE_D0;
 602
 603         return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3_COLD) ?
 604                 m : ACPI_STATE_D0;
 605 }
 606 static inline int acpi_pm_device_run_wake(struct device *dev, bool enable)
 607 {
 608         return -ENODEV;
 609 }
 610 #endif
 611
 612 #ifdef CONFIG_PM_SLEEP
 613 int acpi_pm_device_sleep_wake(struct device *, bool);
 614 #else
 615 static inline int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 616 {
 617         return -ENODEV;
 618 }
 619 #endif
 620
 621 #ifdef CONFIG_ACPI_SLEEP
 622 u32 acpi_target_system_state(void);
 623 #else
 624 static inline u32 acpi_target_system_state(void) { return ACPI_STATE_S0; }
 625 #endif
 626
 627 static inline bool acpi_device_power_manageable(struct acpi_device *adev)
 628 {
 629         return adev->flags.power_manageable;
 630 }
 631
 632 static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
 633 {
 634         return adev->wakeup.flags.valid;
 635 }
 636
 637 static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
 638 {
 639         return adev->power.states[ACPI_STATE_D3_COLD].flags.valid;
 640 }
 641
 642 #else   /* CONFIG_ACPI */
 643
 644 static inline int register_acpi_bus_type(void *bus) { return 0; }
 645 static inline int unregister_acpi_bus_type(void *bus) { return 0; }
 646
 647 #endif                          /* CONFIG_ACPI */
 648
 649 #endif /*__ACPI_BUS_H__*/