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