drivers/acpi/sleep.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   5  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   6  * Copyright (c) 2000-2003 Patrick Mochel
   7  * Copyright (c) 2003 Open Source Development Lab
   8  *
   9  * This file is released under the GPLv2.
  10  *
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/irq.h>
  15 #include <linux/dmi.h>
  16 #include <linux/device.h>
  17 #include <linux/suspend.h>
  18 #include <linux/reboot.h>
  19
  20 #include <asm/io.h>
  21
  22 #include <acpi/acpi_bus.h>
  23 #include <acpi/acpi_drivers.h>
  24
  25 #include "internal.h"
  26 #include "sleep.h"
  27
  28 u8 sleep_states[ACPI_S_STATE_COUNT];
  29
  30 static void acpi_sleep_tts_switch(u32 acpi_state)
  31 {
  32         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  33         struct acpi_object_list arg_list = { 1, &in_arg };
  34         acpi_status status = AE_OK;
  35
  36         in_arg.integer.value = acpi_state;
  37         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  38         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  39                 /*
  40                  * OS can't evaluate the _TTS object correctly. Some warning
  41                  * message will be printed. But it won't break anything.
  42                  */
  43                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  44         }
  45 }
  46
  47 static int tts_notify_reboot(struct notifier_block *this,
  48                         unsigned long code, void *x)
  49 {
  50         acpi_sleep_tts_switch(ACPI_STATE_S5);
  51         return NOTIFY_DONE;
  52 }
  53
  54 static struct notifier_block tts_notifier = {
  55         .notifier_call  = tts_notify_reboot,
  56         .next           = NULL,
  57         .priority       = 0,
  58 };
  59
  60 static int acpi_sleep_prepare(u32 acpi_state)
  61 {
  62 #ifdef CONFIG_ACPI_SLEEP
  63         /* do we have a wakeup address for S2 and S3? */
  64         if (acpi_state == ACPI_STATE_S3) {
  65                 if (!acpi_wakeup_address) {
  66                         return -EFAULT;
  67                 }
  68                 acpi_set_firmware_waking_vector(
  69                                 (acpi_physical_address)acpi_wakeup_address);
  70
  71         }
  72         ACPI_FLUSH_CPU_CACHE();
  73         acpi_enable_wakeup_device_prep(acpi_state);
  74 #endif
  75         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  76                 acpi_state);
  77         acpi_enter_sleep_state_prep(acpi_state);
  78         return 0;
  79 }
  80
  81 #ifdef CONFIG_ACPI_SLEEP
  82 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  83
  84 /*
  85  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
  86  * user to request that behavior by using the 'acpi_old_suspend_ordering'
  87  * kernel command line option that causes the following variable to be set.
  88  */
  89 static bool old_suspend_ordering;
  90
  91 void __init acpi_old_suspend_ordering(void)
  92 {
  93         old_suspend_ordering = true;
  94 }
  95
  96 /**
  97  *      acpi_pm_disable_gpes - Disable the GPEs.
  98  */
  99 static int acpi_pm_disable_gpes(void)
 100 {
 101         acpi_disable_all_gpes();
 102         return 0;
 103 }
 104
 105 /**
 106  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 107  *
 108  *      If necessary, set the firmware waking vector and do arch-specific
 109  *      nastiness to get the wakeup code to the waking vector.
 110  */
 111 static int __acpi_pm_prepare(void)
 112 {
 113         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 114
 115         if (error)
 116                 acpi_target_sleep_state = ACPI_STATE_S0;
 117         return error;
 118 }
 119
 120 /**
 121  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 122  *              state and disable the GPEs.
 123  */
 124 static int acpi_pm_prepare(void)
 125 {
 126         int error = __acpi_pm_prepare();
 127
 128         if (!error)
 129                 acpi_disable_all_gpes();
 130         return error;
 131 }
 132
 133 /**
 134  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 135  *
 136  *      This is called after we wake back up (or if entering the sleep state
 137  *      failed).
 138  */
 139 static void acpi_pm_finish(void)
 140 {
 141         u32 acpi_state = acpi_target_sleep_state;
 142
 143         if (acpi_state == ACPI_STATE_S0)
 144                 return;
 145
 146         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 147                 acpi_state);
 148         acpi_disable_wakeup_device(acpi_state);
 149         acpi_leave_sleep_state(acpi_state);
 150
 151         /* reset firmware waking vector */
 152         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 153
 154         acpi_target_sleep_state = ACPI_STATE_S0;
 155 }
 156
 157 /**
 158  *      acpi_pm_end - Finish up suspend sequence.
 159  */
 160 static void acpi_pm_end(void)
 161 {
 162         /*
 163          * This is necessary in case acpi_pm_finish() is not called during a
 164          * failing transition to a sleep state.
 165          */
 166         acpi_target_sleep_state = ACPI_STATE_S0;
 167         acpi_sleep_tts_switch(acpi_target_sleep_state);
 168 }
 169 #else /* !CONFIG_ACPI_SLEEP */
 170 #define acpi_target_sleep_state ACPI_STATE_S0
 171 #endif /* CONFIG_ACPI_SLEEP */
 172
 173 #ifdef CONFIG_SUSPEND
 174 extern void do_suspend_lowlevel(void);
 175
 176 static u32 acpi_suspend_states[] = {
 177         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 178         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 179         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 180         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 181 };
 182
 183 /**
 184  *      acpi_suspend_begin - Set the target system sleep state to the state
 185  *              associated with given @pm_state, if supported.
 186  */
 187 static int acpi_suspend_begin(suspend_state_t pm_state)
 188 {
 189         u32 acpi_state = acpi_suspend_states[pm_state];
 190         int error = 0;
 191
 192         if (sleep_states[acpi_state]) {
 193                 acpi_target_sleep_state = acpi_state;
 194                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 195         } else {
 196                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 197                         pm_state);
 198                 error = -ENOSYS;
 199         }
 200         return error;
 201 }
 202
 203 /**
 204  *      acpi_suspend_enter - Actually enter a sleep state.
 205  *      @pm_state: ignored
 206  *
 207  *      Flush caches and go to sleep. For STR we have to call arch-specific
 208  *      assembly, which in turn call acpi_enter_sleep_state().
 209  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 210  */
 211 static int acpi_suspend_enter(suspend_state_t pm_state)
 212 {
 213         acpi_status status = AE_OK;
 214         unsigned long flags = 0;
 215         u32 acpi_state = acpi_target_sleep_state;
 216
 217         ACPI_FLUSH_CPU_CACHE();
 218
 219         /* Do arch specific saving of state. */
 220         if (acpi_state == ACPI_STATE_S3) {
 221                 int error = acpi_save_state_mem();
 222
 223                 if (error)
 224                         return error;
 225         }
 226
 227         local_irq_save(flags);
 228         acpi_enable_wakeup_device(acpi_state);
 229         switch (acpi_state) {
 230         case ACPI_STATE_S1:
 231                 barrier();
 232                 status = acpi_enter_sleep_state(acpi_state);
 233                 break;
 234
 235         case ACPI_STATE_S3:
 236                 do_suspend_lowlevel();
 237                 break;
 238         }
 239
 240         /* This violates the spec but is required for bug compatibility. */
 241         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 242
 243         /* Reprogram control registers and execute _BFS */
 244         acpi_leave_sleep_state_prep(acpi_state);
 245
 246         /* ACPI 3.0 specs (P62) says that it's the responsibility
 247          * of the OSPM to clear the status bit [ implying that the
 248          * POWER_BUTTON event should not reach userspace ]
 249          */
 250         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 251                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 252
 253         /*
 254          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 255          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 256          * acpi_leave_sleep_state will reenable specific GPEs later
 257          */
 258         acpi_disable_all_gpes();
 259
 260         local_irq_restore(flags);
 261         printk(KERN_DEBUG "Back to C!\n");
 262
 263         /* restore processor state */
 264         if (acpi_state == ACPI_STATE_S3)
 265                 acpi_restore_state_mem();
 266
 267         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 268 }
 269
 270 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 271 {
 272         u32 acpi_state;
 273
 274         switch (pm_state) {
 275         case PM_SUSPEND_ON:
 276         case PM_SUSPEND_STANDBY:
 277         case PM_SUSPEND_MEM:
 278                 acpi_state = acpi_suspend_states[pm_state];
 279
 280                 return sleep_states[acpi_state];
 281         default:
 282                 return 0;
 283         }
 284 }
 285
 286 static struct platform_suspend_ops acpi_suspend_ops = {
 287         .valid = acpi_suspend_state_valid,
 288         .begin = acpi_suspend_begin,
 289         .prepare_late = acpi_pm_prepare,
 290         .enter = acpi_suspend_enter,
 291         .wake = acpi_pm_finish,
 292         .end = acpi_pm_end,
 293 };
 294
 295 /**
 296  *      acpi_suspend_begin_old - Set the target system sleep state to the
 297  *              state associated with given @pm_state, if supported, and
 298  *              execute the _PTS control method.  This function is used if the
 299  *              pre-ACPI 2.0 suspend ordering has been requested.
 300  */
 301 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 302 {
 303         int error = acpi_suspend_begin(pm_state);
 304
 305         if (!error)
 306                 error = __acpi_pm_prepare();
 307         return error;
 308 }
 309
 310 /*
 311  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 312  * been requested.
 313  */
 314 static struct platform_suspend_ops acpi_suspend_ops_old = {
 315         .valid = acpi_suspend_state_valid,
 316         .begin = acpi_suspend_begin_old,
 317         .prepare_late = acpi_pm_disable_gpes,
 318         .enter = acpi_suspend_enter,
 319         .wake = acpi_pm_finish,
 320         .end = acpi_pm_end,
 321         .recover = acpi_pm_finish,
 322 };
 323
 324 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 325 {
 326         old_suspend_ordering = true;
 327         return 0;
 328 }
 329
 330 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 331         {
 332         .callback = init_old_suspend_ordering,
 333         .ident = "Abit KN9 (nForce4 variant)",
 334         .matches = {
 335                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 336                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 337                 },
 338         },
 339         {
 340         .callback = init_old_suspend_ordering,
 341         .ident = "HP xw4600 Workstation",
 342         .matches = {
 343                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 344                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 345                 },
 346         },
 347         {
 348         .callback = init_old_suspend_ordering,
 349         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 350         .matches = {
 351                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 352                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 353                 },
 354         },
 355         {
 356         .callback = init_old_suspend_ordering,
 357         .ident = "Panasonic CF51-2L",
 358         .matches = {
 359                 DMI_MATCH(DMI_BOARD_VENDOR,
 360                                 "Matsushita Electric Industrial Co.,Ltd."),
 361                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 362                 },
 363         },
 364         {},
 365 };
 366 #endif /* CONFIG_SUSPEND */
 367
 368 #ifdef CONFIG_HIBERNATION
 369 /*
 370  * The ACPI specification wants us to save NVS memory regions during hibernation
 371  * and to restore them during the subsequent resume.  However, it is not certain
 372  * if this mechanism is going to work on all machines, so we allow the user to
 373  * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
 374  * option.
 375  */
 376 static bool s4_no_nvs;
 377
 378 void __init acpi_s4_no_nvs(void)
 379 {
 380         s4_no_nvs = true;
 381 }
 382
 383 static unsigned long s4_hardware_signature;
 384 static struct acpi_table_facs *facs;
 385 static bool nosigcheck;
 386
 387 void __init acpi_no_s4_hw_signature(void)
 388 {
 389         nosigcheck = true;
 390 }
 391
 392 static int acpi_hibernation_begin(void)
 393 {
 394         int error;
 395
 396         error = s4_no_nvs ? 0 : hibernate_nvs_alloc();
 397         if (!error) {
 398                 acpi_target_sleep_state = ACPI_STATE_S4;
 399                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 400         }
 401
 402         return error;
 403 }
 404
 405 static int acpi_hibernation_pre_snapshot(void)
 406 {
 407         int error = acpi_pm_prepare();
 408
 409         if (!error)
 410                 hibernate_nvs_save();
 411
 412         return error;
 413 }
 414
 415 static int acpi_hibernation_enter(void)
 416 {
 417         acpi_status status = AE_OK;
 418         unsigned long flags = 0;
 419
 420         ACPI_FLUSH_CPU_CACHE();
 421
 422         local_irq_save(flags);
 423         acpi_enable_wakeup_device(ACPI_STATE_S4);
 424         /* This shouldn't return.  If it returns, we have a problem */
 425         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 426         /* Reprogram control registers and execute _BFS */
 427         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 428         local_irq_restore(flags);
 429
 430         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 431 }
 432
 433 static void acpi_hibernation_finish(void)
 434 {
 435         hibernate_nvs_free();
 436         acpi_pm_finish();
 437 }
 438
 439 static void acpi_hibernation_leave(void)
 440 {
 441         /*
 442          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 443          * enable it here.
 444          */
 445         acpi_enable();
 446         /* Reprogram control registers and execute _BFS */
 447         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 448         /* Check the hardware signature */
 449         if (facs && s4_hardware_signature != facs->hardware_signature) {
 450                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 451                         "cannot resume!\n");
 452                 panic("ACPI S4 hardware signature mismatch");
 453         }
 454         /* Restore the NVS memory area */
 455         hibernate_nvs_restore();
 456 }
 457
 458 static int acpi_pm_pre_restore(void)
 459 {
 460         acpi_disable_all_gpes();
 461         acpi_os_wait_events_complete(NULL);
 462         acpi_ec_suspend_transactions();
 463         return 0;
 464 }
 465
 466 static void acpi_pm_restore_cleanup(void)
 467 {
 468         acpi_ec_resume_transactions();
 469         acpi_enable_all_runtime_gpes();
 470 }
 471
 472 static struct platform_hibernation_ops acpi_hibernation_ops = {
 473         .begin = acpi_hibernation_begin,
 474         .end = acpi_pm_end,
 475         .pre_snapshot = acpi_hibernation_pre_snapshot,
 476         .finish = acpi_hibernation_finish,
 477         .prepare = acpi_pm_prepare,
 478         .enter = acpi_hibernation_enter,
 479         .leave = acpi_hibernation_leave,
 480         .pre_restore = acpi_pm_pre_restore,
 481         .restore_cleanup = acpi_pm_restore_cleanup,
 482 };
 483
 484 /**
 485  *      acpi_hibernation_begin_old - Set the target system sleep state to
 486  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 487  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 488  *              requested.
 489  */
 490 static int acpi_hibernation_begin_old(void)
 491 {
 492         int error;
 493         /*
 494          * The _TTS object should always be evaluated before the _PTS object.
 495          * When the old_suspended_ordering is true, the _PTS object is
 496          * evaluated in the acpi_sleep_prepare.
 497          */
 498         acpi_sleep_tts_switch(ACPI_STATE_S4);
 499
 500         error = acpi_sleep_prepare(ACPI_STATE_S4);
 501
 502         if (!error) {
 503                 if (!s4_no_nvs)
 504                         error = hibernate_nvs_alloc();
 505                 if (!error)
 506                         acpi_target_sleep_state = ACPI_STATE_S4;
 507         }
 508         return error;
 509 }
 510
 511 static int acpi_hibernation_pre_snapshot_old(void)
 512 {
 513         int error = acpi_pm_disable_gpes();
 514
 515         if (!error)
 516                 hibernate_nvs_save();
 517
 518         return error;
 519 }
 520
 521 /*
 522  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 523  * been requested.
 524  */
 525 static struct platform_hibernation_ops acpi_hibernation_ops_old = {
 526         .begin = acpi_hibernation_begin_old,
 527         .end = acpi_pm_end,
 528         .pre_snapshot = acpi_hibernation_pre_snapshot_old,
 529         .finish = acpi_hibernation_finish,
 530         .prepare = acpi_pm_disable_gpes,
 531         .enter = acpi_hibernation_enter,
 532         .leave = acpi_hibernation_leave,
 533         .pre_restore = acpi_pm_pre_restore,
 534         .restore_cleanup = acpi_pm_restore_cleanup,
 535         .recover = acpi_pm_finish,
 536 };
 537 #endif /* CONFIG_HIBERNATION */
 538
 539 int acpi_suspend(u32 acpi_state)
 540 {
 541         suspend_state_t states[] = {
 542                 [1] = PM_SUSPEND_STANDBY,
 543                 [3] = PM_SUSPEND_MEM,
 544                 [5] = PM_SUSPEND_MAX
 545         };
 546
 547         if (acpi_state < 6 && states[acpi_state])
 548                 return pm_suspend(states[acpi_state]);
 549         if (acpi_state == 4)
 550                 return hibernate();
 551         return -EINVAL;
 552 }
 553
 554 #ifdef CONFIG_PM_SLEEP
 555 /**
 556  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 557  *              in the system sleep state given by %acpi_target_sleep_state
 558  *      @dev: device to examine; its driver model wakeup flags control
 559  *              whether it should be able to wake up the system
 560  *      @d_min_p: used to store the upper limit of allowed states range
 561  *      Return value: preferred power state of the device on success, -ENODEV on
 562  *              failure (ie. if there's no 'struct acpi_device' for @dev)
 563  *
 564  *      Find the lowest power (highest number) ACPI device power state that
 565  *      device @dev can be in while the system is in the sleep state represented
 566  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 567  *      able to wake up the system from this sleep state.  If @d_min_p is set,
 568  *      the highest power (lowest number) device power state of @dev allowed
 569  *      in this system sleep state is stored at the location pointed to by it.
 570  *
 571  *      The caller must ensure that @dev is valid before using this function.
 572  *      The caller is also responsible for figuring out if the device is
 573  *      supposed to be able to wake up the system and passing this information
 574  *      via @wake.
 575  */
 576
 577 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
 578 {
 579         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 580         struct acpi_device *adev;
 581         char acpi_method[] = "_SxD";
 582         unsigned long long d_min, d_max;
 583
 584         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 585                 printk(KERN_DEBUG "ACPI handle has no context!\n");
 586                 return -ENODEV;
 587         }
 588
 589         acpi_method[2] = '0' + acpi_target_sleep_state;
 590         /*
 591          * If the sleep state is S0, we will return D3, but if the device has
 592          * _S0W, we will use the value from _S0W
 593          */
 594         d_min = ACPI_STATE_D0;
 595         d_max = ACPI_STATE_D3;
 596
 597         /*
 598          * If present, _SxD methods return the minimum D-state (highest power
 599          * state) we can use for the corresponding S-states.  Otherwise, the
 600          * minimum D-state is D0 (ACPI 3.x).
 601          *
 602          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 603          * provided -- that's our fault recovery, we ignore retval.
 604          */
 605         if (acpi_target_sleep_state > ACPI_STATE_S0)
 606                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 607
 608         /*
 609          * If _PRW says we can wake up the system from the target sleep state,
 610          * the D-state returned by _SxD is sufficient for that (we assume a
 611          * wakeup-aware driver if wake is set).  Still, if _SxW exists
 612          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 613          * can wake the system.  _S0W may be valid, too.
 614          */
 615         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 616             (device_may_wakeup(dev) && adev->wakeup.state.enabled &&
 617              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
 618                 acpi_status status;
 619
 620                 acpi_method[3] = 'W';
 621                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
 622                                                 &d_max);
 623                 if (ACPI_FAILURE(status)) {
 624                         d_max = d_min;
 625                 } else if (d_max < d_min) {
 626                         /* Warn the user of the broken DSDT */
 627                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
 628                                 acpi_method);
 629                         /* Sanitize it */
 630                         d_min = d_max;
 631                 }
 632         }
 633
 634         if (d_min_p)
 635                 *d_min_p = d_min;
 636         return d_max;
 637 }
 638
 639 /**
 640  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
 641  *                                  capability of given device
 642  *      @dev: device to handle
 643  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
 644  */
 645 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 646 {
 647         acpi_handle handle;
 648         struct acpi_device *adev;
 649         int error;
 650
 651         if (!device_can_wakeup(dev))
 652                 return -EINVAL;
 653
 654         handle = DEVICE_ACPI_HANDLE(dev);
 655         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 656                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
 657                 return -ENODEV;
 658         }
 659
 660         if (enable) {
 661                 error = acpi_enable_wakeup_device_power(adev,
 662                                                 acpi_target_sleep_state);
 663                 if (!error)
 664                         acpi_enable_gpe(adev->wakeup.gpe_device,
 665                                         adev->wakeup.gpe_number,
 666                                         ACPI_GPE_TYPE_WAKE);
 667         } else {
 668                 acpi_disable_gpe(adev->wakeup.gpe_device, adev->wakeup.gpe_number,
 669                                 ACPI_GPE_TYPE_WAKE);
 670                 error = acpi_disable_wakeup_device_power(adev);
 671         }
 672         if (!error)
 673                 dev_info(dev, "wake-up capability %s by ACPI\n",
 674                                 enable ? "enabled" : "disabled");
 675
 676         return error;
 677 }
 678 #endif
 679
 680 static void acpi_power_off_prepare(void)
 681 {
 682         /* Prepare to power off the system */
 683         acpi_sleep_prepare(ACPI_STATE_S5);
 684         acpi_disable_all_gpes();
 685 }
 686
 687 static void acpi_power_off(void)
 688 {
 689         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 690         printk(KERN_DEBUG "%s called\n", __func__);
 691         local_irq_disable();
 692         acpi_enable_wakeup_device(ACPI_STATE_S5);
 693         acpi_enter_sleep_state(ACPI_STATE_S5);
 694 }
 695
 696 /*
 697  * ACPI 2.0 created the optional _GTS and _BFS,
 698  * but industry adoption has been neither rapid nor broad.
 699  *
 700  * Linux gets into trouble when it executes poorly validated
 701  * paths through the BIOS, so disable _GTS and _BFS by default,
 702  * but do speak up and offer the option to enable them.
 703  */
 704 void __init acpi_gts_bfs_check(void)
 705 {
 706         acpi_handle dummy;
 707
 708         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
 709         {
 710                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
 711                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
 712                         "please notify linux-acpi@vger.kernel.org\n");
 713         }
 714         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
 715         {
 716                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
 717                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
 718                         "please notify linux-acpi@vger.kernel.org\n");
 719         }
 720 }
 721
 722 int __init acpi_sleep_init(void)
 723 {
 724         acpi_status status;
 725         u8 type_a, type_b;
 726 #ifdef CONFIG_SUSPEND
 727         int i = 0;
 728
 729         dmi_check_system(acpisleep_dmi_table);
 730 #endif
 731
 732         if (acpi_disabled)
 733                 return 0;
 734
 735         sleep_states[ACPI_STATE_S0] = 1;
 736         printk(KERN_INFO PREFIX "(supports S0");
 737
 738 #ifdef CONFIG_SUSPEND
 739         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 740                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 741                 if (ACPI_SUCCESS(status)) {
 742                         sleep_states[i] = 1;
 743                         printk(" S%d", i);
 744                 }
 745         }
 746
 747         suspend_set_ops(old_suspend_ordering ?
 748                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 749 #endif
 750
 751 #ifdef CONFIG_HIBERNATION
 752         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 753         if (ACPI_SUCCESS(status)) {
 754                 hibernation_set_ops(old_suspend_ordering ?
 755                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 756                 sleep_states[ACPI_STATE_S4] = 1;
 757                 printk(" S4");
 758                 if (!nosigcheck) {
 759                         acpi_get_table(ACPI_SIG_FACS, 1,
 760                                 (struct acpi_table_header **)&facs);
 761                         if (facs)
 762                                 s4_hardware_signature =
 763                                         facs->hardware_signature;
 764                 }
 765         }
 766 #endif
 767         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 768         if (ACPI_SUCCESS(status)) {
 769                 sleep_states[ACPI_STATE_S5] = 1;
 770                 printk(" S5");
 771                 pm_power_off_prepare = acpi_power_off_prepare;
 772                 pm_power_off = acpi_power_off;
 773         }
 774         printk(")\n");
 775         /*
 776          * Register the tts_notifier to reboot notifier list so that the _TTS
 777          * object can also be evaluated when the system enters S5.
 778          */
 779         register_reboot_notifier(&tts_notifier);
 780         acpi_gts_bfs_check();
 781         return 0;
 782 }