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, int rev, u64 funcs);
  65 union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid,
  66                         int rev, int func, union acpi_object *argv4);
  67
  68 static inline union acpi_object *
  69 acpi_evaluate_dsm_typed(acpi_handle handle, const u8 *uuid, int rev, int 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 #ifdef CONFIG_ACPI
  91
  92 #include <linux/proc_fs.h>
  93
  94 #define ACPI_BUS_FILE_ROOT      "acpi"
  95 extern struct proc_dir_entry *acpi_root_dir;
  96
  97 enum acpi_bus_device_type {
  98         ACPI_BUS_TYPE_DEVICE = 0,
  99         ACPI_BUS_TYPE_POWER,
 100         ACPI_BUS_TYPE_PROCESSOR,
 101         ACPI_BUS_TYPE_THERMAL,
 102         ACPI_BUS_TYPE_POWER_BUTTON,
 103         ACPI_BUS_TYPE_SLEEP_BUTTON,
 104         ACPI_BUS_DEVICE_TYPE_COUNT
 105 };
 106
 107 struct acpi_driver;
 108 struct acpi_device;
 109
 110 /*
 111  * ACPI Scan Handler
 112  * -----------------
 113  */
 114
 115 struct acpi_hotplug_profile {
 116         struct kobject kobj;
 117         int (*scan_dependent)(struct acpi_device *adev);
 118         void (*notify_online)(struct acpi_device *adev);
 119         bool enabled:1;
 120         bool demand_offline:1;
 121 };
 122
 123 static inline struct acpi_hotplug_profile *to_acpi_hotplug_profile(
 124                                                 struct kobject *kobj)
 125 {
 126         return container_of(kobj, struct acpi_hotplug_profile, kobj);
 127 }
 128
 129 struct acpi_scan_handler {
 130         const struct acpi_device_id *ids;
 131         struct list_head list_node;
 132         bool (*match)(char *idstr, const struct acpi_device_id **matchid);
 133         int (*attach)(struct acpi_device *dev, const struct acpi_device_id *id);
 134         void (*detach)(struct acpi_device *dev);
 135         void (*bind)(struct device *phys_dev);
 136         void (*unbind)(struct device *phys_dev);
 137         struct acpi_hotplug_profile hotplug;
 138 };
 139
 140 /*
 141  * ACPI Hotplug Context
 142  * --------------------
 143  */
 144
 145 struct acpi_hotplug_context {
 146         struct acpi_device *self;
 147         int (*notify)(struct acpi_device *, u32);
 148         void (*uevent)(struct acpi_device *, u32);
 149         void (*fixup)(struct acpi_device *);
 150 };
 151
 152 /*
 153  * ACPI Driver
 154  * -----------
 155  */
 156
 157 typedef int (*acpi_op_add) (struct acpi_device * device);
 158 typedef int (*acpi_op_remove) (struct acpi_device * device);
 159 typedef void (*acpi_op_notify) (struct acpi_device * device, u32 event);
 160
 161 struct acpi_device_ops {
 162         acpi_op_add add;
 163         acpi_op_remove remove;
 164         acpi_op_notify notify;
 165 };
 166
 167 #define ACPI_DRIVER_ALL_NOTIFY_EVENTS   0x1     /* system AND device events */
 168
 169 struct acpi_driver {
 170         char name[80];
 171         char class[80];
 172         const struct acpi_device_id *ids; /* Supported Hardware IDs */
 173         unsigned int flags;
 174         struct acpi_device_ops ops;
 175         struct device_driver drv;
 176         struct module *owner;
 177 };
 178
 179 /*
 180  * ACPI Device
 181  * -----------
 182  */
 183
 184 /* Status (_STA) */
 185
 186 struct acpi_device_status {
 187         u32 present:1;
 188         u32 enabled:1;
 189         u32 show_in_ui:1;
 190         u32 functional:1;
 191         u32 battery_present:1;
 192         u32 reserved:27;
 193 };
 194
 195 /* Flags */
 196
 197 struct acpi_device_flags {
 198         u32 dynamic_status:1;
 199         u32 removable:1;
 200         u32 ejectable:1;
 201         u32 power_manageable:1;
 202         u32 match_driver:1;
 203         u32 initialized:1;
 204         u32 visited:1;
 205         u32 hotplug_notify:1;
 206         u32 is_dock_station:1;
 207         u32 of_compatible_ok:1;
 208         u32 coherent_dma:1;
 209         u32 cca_seen:1;
 210         u32 reserved:20;
 211 };
 212
 213 /* File System */
 214
 215 struct acpi_device_dir {
 216         struct proc_dir_entry *entry;
 217 };
 218
 219 #define acpi_device_dir(d)      ((d)->dir.entry)
 220
 221 /* Plug and Play */
 222
 223 typedef char acpi_bus_id[8];
 224 typedef unsigned long acpi_bus_address;
 225 typedef char acpi_device_name[40];
 226 typedef char acpi_device_class[20];
 227
 228 struct acpi_hardware_id {
 229         struct list_head list;
 230         char *id;
 231 };
 232
 233 struct acpi_pnp_type {
 234         u32 hardware_id:1;
 235         u32 bus_address:1;
 236         u32 platform_id:1;
 237         u32 reserved:29;
 238 };
 239
 240 struct acpi_device_pnp {
 241         acpi_bus_id bus_id;             /* Object name */
 242         struct acpi_pnp_type type;      /* ID type */
 243         acpi_bus_address bus_address;   /* _ADR */
 244         char *unique_id;                /* _UID */
 245         struct list_head ids;           /* _HID and _CIDs */
 246         acpi_device_name device_name;   /* Driver-determined */
 247         acpi_device_class device_class; /*        "          */
 248         union acpi_object *str_obj;     /* unicode string for _STR method */
 249 };
 250
 251 #define acpi_device_bid(d)      ((d)->pnp.bus_id)
 252 #define acpi_device_adr(d)      ((d)->pnp.bus_address)
 253 const char *acpi_device_hid(struct acpi_device *device);
 254 #define acpi_device_uid(d)      ((d)->pnp.unique_id)
 255 #define acpi_device_name(d)     ((d)->pnp.device_name)
 256 #define acpi_device_class(d)    ((d)->pnp.device_class)
 257
 258 /* Power Management */
 259
 260 struct acpi_device_power_flags {
 261         u32 explicit_get:1;     /* _PSC present? */
 262         u32 power_resources:1;  /* Power resources */
 263         u32 inrush_current:1;   /* Serialize Dx->D0 */
 264         u32 power_removed:1;    /* Optimize Dx->D0 */
 265         u32 ignore_parent:1;    /* Power is independent of parent power state */
 266         u32 dsw_present:1;      /* _DSW present? */
 267         u32 reserved:26;
 268 };
 269
 270 struct acpi_device_power_state {
 271         struct {
 272                 u8 valid:1;
 273                 u8 explicit_set:1;      /* _PSx present? */
 274                 u8 reserved:6;
 275         } flags;
 276         int power;              /* % Power (compared to D0) */
 277         int latency;            /* Dx->D0 time (microseconds) */
 278         struct list_head resources;     /* Power resources referenced */
 279 };
 280
 281 struct acpi_device_power {
 282         int state;              /* Current state */
 283         struct acpi_device_power_flags flags;
 284         struct acpi_device_power_state states[ACPI_D_STATE_COUNT];      /* Power states (D0-D3Cold) */
 285 };
 286
 287 /* Performance Management */
 288
 289 struct acpi_device_perf_flags {
 290         u8 reserved:8;
 291 };
 292
 293 struct acpi_device_perf_state {
 294         struct {
 295                 u8 valid:1;
 296                 u8 reserved:7;
 297         } flags;
 298         u8 power;               /* % Power (compared to P0) */
 299         u8 performance;         /* % Performance (    "   ) */
 300         int latency;            /* Px->P0 time (microseconds) */
 301 };
 302
 303 struct acpi_device_perf {
 304         int state;
 305         struct acpi_device_perf_flags flags;
 306         int state_count;
 307         struct acpi_device_perf_state *states;
 308 };
 309
 310 /* Wakeup Management */
 311 struct acpi_device_wakeup_flags {
 312         u8 valid:1;             /* Can successfully enable wakeup? */
 313         u8 run_wake:1;          /* Run-Wake GPE devices */
 314         u8 notifier_present:1;  /* Wake-up notify handler has been installed */
 315         u8 enabled:1;           /* Enabled for wakeup */
 316 };
 317
 318 struct acpi_device_wakeup_context {
 319         struct work_struct work;
 320         struct device *dev;
 321 };
 322
 323 struct acpi_device_wakeup {
 324         acpi_handle gpe_device;
 325         u64 gpe_number;
 326         u64 sleep_state;
 327         struct list_head resources;
 328         struct acpi_device_wakeup_flags flags;
 329         struct acpi_device_wakeup_context context;
 330         struct wakeup_source *ws;
 331         int prepare_count;
 332 };
 333
 334 struct acpi_device_physical_node {
 335         unsigned int node_id;
 336         struct list_head node;
 337         struct device *dev;
 338         bool put_online:1;
 339 };
 340
 341 /* ACPI Device Specific Data (_DSD) */
 342 struct acpi_device_data {
 343         const union acpi_object *pointer;
 344         const union acpi_object *properties;
 345         const union acpi_object *of_compatible;
 346 };
 347
 348 struct acpi_gpio_mapping;
 349
 350 /* Device */
 351 struct acpi_device {
 352         int device_type;
 353         acpi_handle handle;             /* no handle for fixed hardware */
 354         struct fwnode_handle fwnode;
 355         struct acpi_device *parent;
 356         struct list_head children;
 357         struct list_head node;
 358         struct list_head wakeup_list;
 359         struct list_head del_list;
 360         struct acpi_device_status status;
 361         struct acpi_device_flags flags;
 362         struct acpi_device_pnp pnp;
 363         struct acpi_device_power power;
 364         struct acpi_device_wakeup wakeup;
 365         struct acpi_device_perf performance;
 366         struct acpi_device_dir dir;
 367         struct acpi_device_data data;
 368         struct acpi_scan_handler *handler;
 369         struct acpi_hotplug_context *hp;
 370         struct acpi_driver *driver;
 371         const struct acpi_gpio_mapping *driver_gpios;
 372         void *driver_data;
 373         struct device dev;
 374         unsigned int physical_node_count;
 375         unsigned int dep_unmet;
 376         struct list_head physical_node_list;
 377         struct mutex physical_node_lock;
 378         void (*remove)(struct acpi_device *);
 379 };
 380
 381 static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent)
 382 {
 383         bool ret = false;
 384
 385         if (!adev)
 386                 return ret;
 387
 388         /**
 389          * Currently, we only support _CCA=1 (i.e. coherent_dma=1)
 390          * This should be equivalent to specifyig dma-coherent for
 391          * a device in OF.
 392          *
 393          * For the case when _CCA=0 (i.e. coherent_dma=0 && cca_seen=1),
 394          * There are two cases:
 395          * case 1. Do not support and disable DMA.
 396          * case 2. Support but rely on arch-specific cache maintenance for
 397          *         non-coherence DMA operations.
 398          * Currently, we implement case 1 above.
 399          *
 400          * For the case when _CCA is missing (i.e. cca_seen=0) and
 401          * platform specifies ACPI_CCA_REQUIRED, we do not support DMA,
 402          * and fallback to arch-specific default handling.
 403          *
 404          * See acpi_init_coherency() for more info.
 405          */
 406         if (adev->flags.coherent_dma) {
 407                 ret = true;
 408                 if (coherent)
 409                         *coherent = adev->flags.coherent_dma;
 410         }
 411         return ret;
 412 }
 413
 414 static inline bool is_acpi_node(struct fwnode_handle *fwnode)
 415 {
 416         return fwnode && fwnode->type == FWNODE_ACPI;
 417 }
 418
 419 static inline struct acpi_device *to_acpi_node(struct fwnode_handle *fwnode)
 420 {
 421         return is_acpi_node(fwnode) ?
 422                 container_of(fwnode, struct acpi_device, fwnode) : NULL;
 423 }
 424
 425 static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
 426 {
 427         return &adev->fwnode;
 428 }
 429
 430 static inline void *acpi_driver_data(struct acpi_device *d)
 431 {
 432         return d->driver_data;
 433 }
 434
 435 #define to_acpi_device(d)       container_of(d, struct acpi_device, dev)
 436 #define to_acpi_driver(d)       container_of(d, struct acpi_driver, drv)
 437
 438 static inline void acpi_set_device_status(struct acpi_device *adev, u32 sta)
 439 {
 440         *((u32 *)&adev->status) = sta;
 441 }
 442
 443 static inline void acpi_set_hp_context(struct acpi_device *adev,
 444                                        struct acpi_hotplug_context *hp)
 445 {
 446         hp->self = adev;
 447         adev->hp = hp;
 448 }
 449
 450 void acpi_initialize_hp_context(struct acpi_device *adev,
 451                                 struct acpi_hotplug_context *hp,
 452                                 int (*notify)(struct acpi_device *, u32),
 453                                 void (*uevent)(struct acpi_device *, u32));
 454
 455 /* acpi_device.dev.bus == &acpi_bus_type */
 456 extern struct bus_type acpi_bus_type;
 457
 458 /*
 459  * Events
 460  * ------
 461  */
 462
 463 struct acpi_bus_event {
 464         struct list_head node;
 465         acpi_device_class device_class;
 466         acpi_bus_id bus_id;
 467         u32 type;
 468         u32 data;
 469 };
 470
 471 extern struct kobject *acpi_kobj;
 472 extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
 473 void acpi_bus_private_data_handler(acpi_handle, void *);
 474 int acpi_bus_get_private_data(acpi_handle, void **);
 475 int acpi_bus_attach_private_data(acpi_handle, void *);
 476 void acpi_bus_detach_private_data(acpi_handle);
 477 extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
 478 extern int register_acpi_notifier(struct notifier_block *);
 479 extern int unregister_acpi_notifier(struct notifier_block *);
 480
 481 /*
 482  * External Functions
 483  */
 484
 485 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device);
 486 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle);
 487 void acpi_bus_put_acpi_device(struct acpi_device *adev);
 488 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 489                                        unsigned long long *sta);
 490 int acpi_bus_get_status(struct acpi_device *device);
 491
 492 int acpi_bus_set_power(acpi_handle handle, int state);
 493 const char *acpi_power_state_string(int state);
 494 int acpi_device_get_power(struct acpi_device *device, int *state);
 495 int acpi_device_set_power(struct acpi_device *device, int state);
 496 int acpi_bus_init_power(struct acpi_device *device);
 497 int acpi_device_fix_up_power(struct acpi_device *device);
 498 int acpi_bus_update_power(acpi_handle handle, int *state_p);
 499 int acpi_device_update_power(struct acpi_device *device, int *state_p);
 500 bool acpi_bus_power_manageable(acpi_handle handle);
 501
 502 #ifdef CONFIG_PM
 503 bool acpi_bus_can_wakeup(acpi_handle handle);
 504 #else
 505 static inline bool acpi_bus_can_wakeup(acpi_handle handle) { return false; }
 506 #endif
 507
 508 void acpi_scan_lock_acquire(void);
 509 void acpi_scan_lock_release(void);
 510 void acpi_lock_hp_context(void);
 511 void acpi_unlock_hp_context(void);
 512 int acpi_scan_add_handler(struct acpi_scan_handler *handler);
 513 int acpi_bus_register_driver(struct acpi_driver *driver);
 514 void acpi_bus_unregister_driver(struct acpi_driver *driver);
 515 int acpi_bus_scan(acpi_handle handle);
 516 void acpi_bus_trim(struct acpi_device *start);
 517 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
 518 int acpi_match_device_ids(struct acpi_device *device,
 519                           const struct acpi_device_id *ids);
 520 int acpi_create_dir(struct acpi_device *);
 521 void acpi_remove_dir(struct acpi_device *);
 522
 523 static inline bool acpi_device_enumerated(struct acpi_device *adev)
 524 {
 525         return adev && adev->flags.initialized && adev->flags.visited;
 526 }
 527
 528 /**
 529  * module_acpi_driver(acpi_driver) - Helper macro for registering an ACPI driver
 530  * @__acpi_driver: acpi_driver struct
 531  *
 532  * Helper macro for ACPI drivers which do not do anything special in module
 533  * init/exit. This eliminates a lot of boilerplate. Each module may only
 534  * use this macro once, and calling it replaces module_init() and module_exit()
 535  */
 536 #define module_acpi_driver(__acpi_driver) \
 537         module_driver(__acpi_driver, acpi_bus_register_driver, \
 538                       acpi_bus_unregister_driver)
 539
 540 /*
 541  * Bind physical devices with ACPI devices
 542  */
 543 struct acpi_bus_type {
 544         struct list_head list;
 545         const char *name;
 546         bool (*match)(struct device *dev);
 547         struct acpi_device * (*find_companion)(struct device *);
 548         void (*setup)(struct device *);
 549         void (*cleanup)(struct device *);
 550 };
 551 int register_acpi_bus_type(struct acpi_bus_type *);
 552 int unregister_acpi_bus_type(struct acpi_bus_type *);
 553 int acpi_bind_one(struct device *dev, struct acpi_device *adev);
 554 int acpi_unbind_one(struct device *dev);
 555
 556 struct acpi_pci_root {
 557         struct acpi_device * device;
 558         struct pci_bus *bus;
 559         u16 segment;
 560         struct resource secondary;      /* downstream bus range */
 561
 562         u32 osc_support_set;    /* _OSC state of support bits */
 563         u32 osc_control_set;    /* _OSC state of control bits */
 564         phys_addr_t mcfg_addr;
 565 };
 566
 567 /* helper */
 568
 569 struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
 570                                            u64 address, bool check_children);
 571 int acpi_is_root_bridge(acpi_handle);
 572 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle);
 573
 574 int acpi_enable_wakeup_device_power(struct acpi_device *dev, int state);
 575 int acpi_disable_wakeup_device_power(struct acpi_device *dev);
 576
 577 #ifdef CONFIG_PM
 578 acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
 579                                  void (*work_func)(struct work_struct *work));
 580 acpi_status acpi_remove_pm_notifier(struct acpi_device *adev);
 581 int acpi_pm_device_sleep_state(struct device *, int *, int);
 582 int acpi_pm_device_run_wake(struct device *, bool);
 583 #else
 584 static inline acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
 585                                                struct device *dev,
 586                                                void (*work_func)(struct work_struct *work))
 587 {
 588         return AE_SUPPORT;
 589 }
 590 static inline acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
 591 {
 592         return AE_SUPPORT;
 593 }
 594 static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)
 595 {
 596         if (p)
 597                 *p = ACPI_STATE_D0;
 598
 599         return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3_COLD) ?
 600                 m : ACPI_STATE_D0;
 601 }
 602 static inline int acpi_pm_device_run_wake(struct device *dev, bool enable)
 603 {
 604         return -ENODEV;
 605 }
 606 #endif
 607
 608 #ifdef CONFIG_PM_SLEEP
 609 int acpi_pm_device_sleep_wake(struct device *, bool);
 610 #else
 611 static inline int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 612 {
 613         return -ENODEV;
 614 }
 615 #endif
 616
 617 #ifdef CONFIG_ACPI_SLEEP
 618 u32 acpi_target_system_state(void);
 619 #else
 620 static inline u32 acpi_target_system_state(void) { return ACPI_STATE_S0; }
 621 #endif
 622
 623 static inline bool acpi_device_power_manageable(struct acpi_device *adev)
 624 {
 625         return adev->flags.power_manageable;
 626 }
 627
 628 static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
 629 {
 630         return adev->wakeup.flags.valid;
 631 }
 632
 633 static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
 634 {
 635         return adev->power.states[ACPI_STATE_D3_COLD].flags.valid;
 636 }
 637
 638 #else   /* CONFIG_ACPI */
 639
 640 static inline int register_acpi_bus_type(void *bus) { return 0; }
 641 static inline int unregister_acpi_bus_type(void *bus) { return 0; }
 642
 643 #endif                          /* CONFIG_ACPI */
 644
 645 #endif /*__ACPI_BUS_H__*/