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 #include <linux/acpi.h>
  20
  21 #include <asm/io.h>
  22
  23 #include <acpi/acpi_bus.h>
  24 #include <acpi/acpi_drivers.h>
  25
  26 #include "internal.h"
  27 #include "sleep.h"
  28
  29 static u8 sleep_states[ACPI_S_STATE_COUNT];
  30
  31 static void acpi_sleep_tts_switch(u32 acpi_state)
  32 {
  33         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  34         struct acpi_object_list arg_list = { 1, &in_arg };
  35         acpi_status status = AE_OK;
  36
  37         in_arg.integer.value = acpi_state;
  38         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  39         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  40                 /*
  41                  * OS can't evaluate the _TTS object correctly. Some warning
  42                  * message will be printed. But it won't break anything.
  43                  */
  44                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  45         }
  46 }
  47
  48 static int tts_notify_reboot(struct notifier_block *this,
  49                         unsigned long code, void *x)
  50 {
  51         acpi_sleep_tts_switch(ACPI_STATE_S5);
  52         return NOTIFY_DONE;
  53 }
  54
  55 static struct notifier_block tts_notifier = {
  56         .notifier_call  = tts_notify_reboot,
  57         .next           = NULL,
  58         .priority       = 0,
  59 };
  60
  61 static int acpi_sleep_prepare(u32 acpi_state)
  62 {
  63 #ifdef CONFIG_ACPI_SLEEP
  64         /* do we have a wakeup address for S2 and S3? */
  65         if (acpi_state == ACPI_STATE_S3) {
  66                 if (!acpi_wakeup_address) {
  67                         return -EFAULT;
  68                 }
  69                 acpi_set_firmware_waking_vector(
  70                                 (acpi_physical_address)acpi_wakeup_address);
  71
  72         }
  73         ACPI_FLUSH_CPU_CACHE();
  74 #endif
  75         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  76                 acpi_state);
  77         acpi_enable_wakeup_devices(acpi_state);
  78         acpi_enter_sleep_state_prep(acpi_state);
  79         return 0;
  80 }
  81
  82 #ifdef CONFIG_ACPI_SLEEP
  83 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  84
  85 /*
  86  * The ACPI specification wants us to save NVS memory regions during hibernation
  87  * and to restore them during the subsequent resume.  Windows does that also for
  88  * suspend to RAM.  However, it is known that this mechanism does not work on
  89  * all machines, so we allow the user to disable it with the help of the
  90  * 'acpi_sleep=nonvs' kernel command line option.
  91  */
  92 static bool nvs_nosave;
  93
  94 void __init acpi_nvs_nosave(void)
  95 {
  96         nvs_nosave = true;
  97 }
  98
  99 /*
 100  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 101  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 102  * kernel command line option that causes the following variable to be set.
 103  */
 104 static bool old_suspend_ordering;
 105
 106 void __init acpi_old_suspend_ordering(void)
 107 {
 108         old_suspend_ordering = true;
 109 }
 110
 111 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 112 {
 113         acpi_old_suspend_ordering();
 114         return 0;
 115 }
 116
 117 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 118 {
 119         acpi_nvs_nosave();
 120         return 0;
 121 }
 122
 123 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 124         {
 125         .callback = init_old_suspend_ordering,
 126         .ident = "Abit KN9 (nForce4 variant)",
 127         .matches = {
 128                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 129                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 130                 },
 131         },
 132         {
 133         .callback = init_old_suspend_ordering,
 134         .ident = "HP xw4600 Workstation",
 135         .matches = {
 136                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 137                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 138                 },
 139         },
 140         {
 141         .callback = init_old_suspend_ordering,
 142         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 143         .matches = {
 144                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 145                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 146                 },
 147         },
 148         {
 149         .callback = init_old_suspend_ordering,
 150         .ident = "Panasonic CF51-2L",
 151         .matches = {
 152                 DMI_MATCH(DMI_BOARD_VENDOR,
 153                                 "Matsushita Electric Industrial Co.,Ltd."),
 154                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 155                 },
 156         },
 157         {
 158         .callback = init_nvs_nosave,
 159         .ident = "Sony Vaio VGN-FW41E_H",
 160         .matches = {
 161                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 162                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
 163                 },
 164         },
 165         {
 166         .callback = init_nvs_nosave,
 167         .ident = "Sony Vaio VGN-FW21E",
 168         .matches = {
 169                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 170                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 171                 },
 172         },
 173         {
 174         .callback = init_nvs_nosave,
 175         .ident = "Sony Vaio VPCEB17FX",
 176         .matches = {
 177                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 178                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 179                 },
 180         },
 181         {
 182         .callback = init_nvs_nosave,
 183         .ident = "Sony Vaio VGN-SR11M",
 184         .matches = {
 185                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 186                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 187                 },
 188         },
 189         {
 190         .callback = init_nvs_nosave,
 191         .ident = "Everex StepNote Series",
 192         .matches = {
 193                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 194                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 195                 },
 196         },
 197         {
 198         .callback = init_nvs_nosave,
 199         .ident = "Sony Vaio VPCEB1Z1E",
 200         .matches = {
 201                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 202                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 203                 },
 204         },
 205         {
 206         .callback = init_nvs_nosave,
 207         .ident = "Sony Vaio VGN-NW130D",
 208         .matches = {
 209                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 210                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 211                 },
 212         },
 213         {
 214         .callback = init_nvs_nosave,
 215         .ident = "Sony Vaio VPCCW29FX",
 216         .matches = {
 217                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 218                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 219                 },
 220         },
 221         {
 222         .callback = init_nvs_nosave,
 223         .ident = "Averatec AV1020-ED2",
 224         .matches = {
 225                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 226                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 227                 },
 228         },
 229         {
 230         .callback = init_old_suspend_ordering,
 231         .ident = "Asus A8N-SLI DELUXE",
 232         .matches = {
 233                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 234                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 235                 },
 236         },
 237         {
 238         .callback = init_old_suspend_ordering,
 239         .ident = "Asus A8N-SLI Premium",
 240         .matches = {
 241                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 242                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 243                 },
 244         },
 245         {
 246         .callback = init_nvs_nosave,
 247         .ident = "Sony Vaio VGN-SR26GN_P",
 248         .matches = {
 249                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 250                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 251                 },
 252         },
 253         {
 254         .callback = init_nvs_nosave,
 255         .ident = "Sony Vaio VPCEB1S1E",
 256         .matches = {
 257                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 258                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
 259                 },
 260         },
 261         {
 262         .callback = init_nvs_nosave,
 263         .ident = "Sony Vaio VGN-FW520F",
 264         .matches = {
 265                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 266                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 267                 },
 268         },
 269         {
 270         .callback = init_nvs_nosave,
 271         .ident = "Asus K54C",
 272         .matches = {
 273                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 274                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 275                 },
 276         },
 277         {
 278         .callback = init_nvs_nosave,
 279         .ident = "Asus K54HR",
 280         .matches = {
 281                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 282                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 283                 },
 284         },
 285         {},
 286 };
 287
 288 static void acpi_sleep_dmi_check(void)
 289 {
 290         dmi_check_system(acpisleep_dmi_table);
 291 }
 292
 293 /**
 294  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 295  */
 296 static int acpi_pm_freeze(void)
 297 {
 298         acpi_disable_all_gpes();
 299         acpi_os_wait_events_complete(NULL);
 300         acpi_ec_block_transactions();
 301         return 0;
 302 }
 303
 304 /**
 305  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 306  */
 307 static int acpi_pm_pre_suspend(void)
 308 {
 309         acpi_pm_freeze();
 310         return suspend_nvs_save();
 311 }
 312
 313 /**
 314  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 315  *
 316  *      If necessary, set the firmware waking vector and do arch-specific
 317  *      nastiness to get the wakeup code to the waking vector.
 318  */
 319 static int __acpi_pm_prepare(void)
 320 {
 321         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 322         if (error)
 323                 acpi_target_sleep_state = ACPI_STATE_S0;
 324
 325         return error;
 326 }
 327
 328 /**
 329  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 330  *              state and disable the GPEs.
 331  */
 332 static int acpi_pm_prepare(void)
 333 {
 334         int error = __acpi_pm_prepare();
 335         if (!error)
 336                 error = acpi_pm_pre_suspend();
 337
 338         return error;
 339 }
 340
 341 /**
 342  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 343  *
 344  *      This is called after we wake back up (or if entering the sleep state
 345  *      failed).
 346  */
 347 static void acpi_pm_finish(void)
 348 {
 349         u32 acpi_state = acpi_target_sleep_state;
 350
 351         acpi_ec_unblock_transactions();
 352         suspend_nvs_free();
 353
 354         if (acpi_state == ACPI_STATE_S0)
 355                 return;
 356
 357         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 358                 acpi_state);
 359         acpi_disable_wakeup_devices(acpi_state);
 360         acpi_leave_sleep_state(acpi_state);
 361
 362         /* reset firmware waking vector */
 363         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 364
 365         acpi_target_sleep_state = ACPI_STATE_S0;
 366 }
 367
 368 /**
 369  *      acpi_pm_end - Finish up suspend sequence.
 370  */
 371 static void acpi_pm_end(void)
 372 {
 373         /*
 374          * This is necessary in case acpi_pm_finish() is not called during a
 375          * failing transition to a sleep state.
 376          */
 377         acpi_target_sleep_state = ACPI_STATE_S0;
 378         acpi_sleep_tts_switch(acpi_target_sleep_state);
 379 }
 380 #else /* !CONFIG_ACPI_SLEEP */
 381 #define acpi_target_sleep_state ACPI_STATE_S0
 382 static inline void acpi_sleep_dmi_check(void) {}
 383 #endif /* CONFIG_ACPI_SLEEP */
 384
 385 #ifdef CONFIG_SUSPEND
 386 static u32 acpi_suspend_states[] = {
 387         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 388         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 389         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 390         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 391 };
 392
 393 /**
 394  *      acpi_suspend_begin - Set the target system sleep state to the state
 395  *              associated with given @pm_state, if supported.
 396  */
 397 static int acpi_suspend_begin(suspend_state_t pm_state)
 398 {
 399         u32 acpi_state = acpi_suspend_states[pm_state];
 400         int error = 0;
 401
 402         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 403         if (error)
 404                 return error;
 405
 406         if (sleep_states[acpi_state]) {
 407                 acpi_target_sleep_state = acpi_state;
 408                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 409         } else {
 410                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 411                         pm_state);
 412                 error = -ENOSYS;
 413         }
 414         return error;
 415 }
 416
 417 /**
 418  *      acpi_suspend_enter - Actually enter a sleep state.
 419  *      @pm_state: ignored
 420  *
 421  *      Flush caches and go to sleep. For STR we have to call arch-specific
 422  *      assembly, which in turn call acpi_enter_sleep_state().
 423  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 424  */
 425 static int acpi_suspend_enter(suspend_state_t pm_state)
 426 {
 427         acpi_status status = AE_OK;
 428         u32 acpi_state = acpi_target_sleep_state;
 429         int error;
 430
 431         ACPI_FLUSH_CPU_CACHE();
 432
 433         switch (acpi_state) {
 434         case ACPI_STATE_S1:
 435                 barrier();
 436                 status = acpi_enter_sleep_state(acpi_state);
 437                 break;
 438
 439         case ACPI_STATE_S3:
 440                 error = acpi_suspend_lowlevel();
 441                 if (error)
 442                         return error;
 443                 pr_info(PREFIX "Low-level resume complete\n");
 444                 break;
 445         }
 446
 447         /* This violates the spec but is required for bug compatibility. */
 448         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 449
 450         /* Reprogram control registers and execute _BFS */
 451         acpi_leave_sleep_state_prep(acpi_state);
 452
 453         /* ACPI 3.0 specs (P62) says that it's the responsibility
 454          * of the OSPM to clear the status bit [ implying that the
 455          * POWER_BUTTON event should not reach userspace ]
 456          */
 457         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 458                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 459
 460         /*
 461          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 462          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 463          * acpi_leave_sleep_state will reenable specific GPEs later
 464          */
 465         acpi_disable_all_gpes();
 466         /* Allow EC transactions to happen. */
 467         acpi_ec_unblock_transactions_early();
 468
 469         suspend_nvs_restore();
 470
 471         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 472 }
 473
 474 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 475 {
 476         u32 acpi_state;
 477
 478         switch (pm_state) {
 479         case PM_SUSPEND_ON:
 480         case PM_SUSPEND_STANDBY:
 481         case PM_SUSPEND_MEM:
 482                 acpi_state = acpi_suspend_states[pm_state];
 483
 484                 return sleep_states[acpi_state];
 485         default:
 486                 return 0;
 487         }
 488 }
 489
 490 static const struct platform_suspend_ops acpi_suspend_ops = {
 491         .valid = acpi_suspend_state_valid,
 492         .begin = acpi_suspend_begin,
 493         .prepare_late = acpi_pm_prepare,
 494         .enter = acpi_suspend_enter,
 495         .wake = acpi_pm_finish,
 496         .end = acpi_pm_end,
 497 };
 498
 499 /**
 500  *      acpi_suspend_begin_old - Set the target system sleep state to the
 501  *              state associated with given @pm_state, if supported, and
 502  *              execute the _PTS control method.  This function is used if the
 503  *              pre-ACPI 2.0 suspend ordering has been requested.
 504  */
 505 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 506 {
 507         int error = acpi_suspend_begin(pm_state);
 508         if (!error)
 509                 error = __acpi_pm_prepare();
 510
 511         return error;
 512 }
 513
 514 /*
 515  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 516  * been requested.
 517  */
 518 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 519         .valid = acpi_suspend_state_valid,
 520         .begin = acpi_suspend_begin_old,
 521         .prepare_late = acpi_pm_pre_suspend,
 522         .enter = acpi_suspend_enter,
 523         .wake = acpi_pm_finish,
 524         .end = acpi_pm_end,
 525         .recover = acpi_pm_finish,
 526 };
 527 #endif /* CONFIG_SUSPEND */
 528
 529 #ifdef CONFIG_HIBERNATION
 530 static unsigned long s4_hardware_signature;
 531 static struct acpi_table_facs *facs;
 532 static bool nosigcheck;
 533
 534 void __init acpi_no_s4_hw_signature(void)
 535 {
 536         nosigcheck = true;
 537 }
 538
 539 static int acpi_hibernation_begin(void)
 540 {
 541         int error;
 542
 543         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 544         if (!error) {
 545                 acpi_target_sleep_state = ACPI_STATE_S4;
 546                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 547         }
 548
 549         return error;
 550 }
 551
 552 static int acpi_hibernation_enter(void)
 553 {
 554         acpi_status status = AE_OK;
 555
 556         ACPI_FLUSH_CPU_CACHE();
 557
 558         /* This shouldn't return.  If it returns, we have a problem */
 559         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 560         /* Reprogram control registers and execute _BFS */
 561         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 562
 563         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 564 }
 565
 566 static void acpi_hibernation_leave(void)
 567 {
 568         /*
 569          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 570          * enable it here.
 571          */
 572         acpi_enable();
 573         /* Reprogram control registers and execute _BFS */
 574         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 575         /* Check the hardware signature */
 576         if (facs && s4_hardware_signature != facs->hardware_signature) {
 577                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 578                         "cannot resume!\n");
 579                 panic("ACPI S4 hardware signature mismatch");
 580         }
 581         /* Restore the NVS memory area */
 582         suspend_nvs_restore();
 583         /* Allow EC transactions to happen. */
 584         acpi_ec_unblock_transactions_early();
 585 }
 586
 587 static void acpi_pm_thaw(void)
 588 {
 589         acpi_ec_unblock_transactions();
 590         acpi_enable_all_runtime_gpes();
 591 }
 592
 593 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 594         .begin = acpi_hibernation_begin,
 595         .end = acpi_pm_end,
 596         .pre_snapshot = acpi_pm_prepare,
 597         .finish = acpi_pm_finish,
 598         .prepare = acpi_pm_prepare,
 599         .enter = acpi_hibernation_enter,
 600         .leave = acpi_hibernation_leave,
 601         .pre_restore = acpi_pm_freeze,
 602         .restore_cleanup = acpi_pm_thaw,
 603 };
 604
 605 /**
 606  *      acpi_hibernation_begin_old - Set the target system sleep state to
 607  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 608  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 609  *              requested.
 610  */
 611 static int acpi_hibernation_begin_old(void)
 612 {
 613         int error;
 614         /*
 615          * The _TTS object should always be evaluated before the _PTS object.
 616          * When the old_suspended_ordering is true, the _PTS object is
 617          * evaluated in the acpi_sleep_prepare.
 618          */
 619         acpi_sleep_tts_switch(ACPI_STATE_S4);
 620
 621         error = acpi_sleep_prepare(ACPI_STATE_S4);
 622
 623         if (!error) {
 624                 if (!nvs_nosave)
 625                         error = suspend_nvs_alloc();
 626                 if (!error)
 627                         acpi_target_sleep_state = ACPI_STATE_S4;
 628         }
 629         return error;
 630 }
 631
 632 /*
 633  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 634  * been requested.
 635  */
 636 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 637         .begin = acpi_hibernation_begin_old,
 638         .end = acpi_pm_end,
 639         .pre_snapshot = acpi_pm_pre_suspend,
 640         .prepare = acpi_pm_freeze,
 641         .finish = acpi_pm_finish,
 642         .enter = acpi_hibernation_enter,
 643         .leave = acpi_hibernation_leave,
 644         .pre_restore = acpi_pm_freeze,
 645         .restore_cleanup = acpi_pm_thaw,
 646         .recover = acpi_pm_finish,
 647 };
 648 #endif /* CONFIG_HIBERNATION */
 649
 650 int acpi_suspend(u32 acpi_state)
 651 {
 652         suspend_state_t states[] = {
 653                 [1] = PM_SUSPEND_STANDBY,
 654                 [3] = PM_SUSPEND_MEM,
 655                 [5] = PM_SUSPEND_MAX
 656         };
 657
 658         if (acpi_state < 6 && states[acpi_state])
 659                 return pm_suspend(states[acpi_state]);
 660         if (acpi_state == 4)
 661                 return hibernate();
 662         return -EINVAL;
 663 }
 664
 665 #ifdef CONFIG_PM
 666 /**
 667  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 668  *              in the system sleep state given by %acpi_target_sleep_state
 669  *      @dev: device to examine; its driver model wakeup flags control
 670  *              whether it should be able to wake up the system
 671  *      @d_min_p: used to store the upper limit of allowed states range
 672  *      Return value: preferred power state of the device on success, -ENODEV on
 673  *              failure (ie. if there's no 'struct acpi_device' for @dev)
 674  *
 675  *      Find the lowest power (highest number) ACPI device power state that
 676  *      device @dev can be in while the system is in the sleep state represented
 677  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 678  *      able to wake up the system from this sleep state.  If @d_min_p is set,
 679  *      the highest power (lowest number) device power state of @dev allowed
 680  *      in this system sleep state is stored at the location pointed to by it.
 681  *
 682  *      The caller must ensure that @dev is valid before using this function.
 683  *      The caller is also responsible for figuring out if the device is
 684  *      supposed to be able to wake up the system and passing this information
 685  *      via @wake.
 686  */
 687
 688 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
 689 {
 690         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 691         struct acpi_device *adev;
 692         char acpi_method[] = "_SxD";
 693         unsigned long long d_min, d_max;
 694
 695         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 696                 printk(KERN_DEBUG "ACPI handle has no context!\n");
 697                 return -ENODEV;
 698         }
 699
 700         acpi_method[2] = '0' + acpi_target_sleep_state;
 701         /*
 702          * If the sleep state is S0, we will return D3, but if the device has
 703          * _S0W, we will use the value from _S0W
 704          */
 705         d_min = ACPI_STATE_D0;
 706         d_max = ACPI_STATE_D3;
 707
 708         /*
 709          * If present, _SxD methods return the minimum D-state (highest power
 710          * state) we can use for the corresponding S-states.  Otherwise, the
 711          * minimum D-state is D0 (ACPI 3.x).
 712          *
 713          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 714          * provided -- that's our fault recovery, we ignore retval.
 715          */
 716         if (acpi_target_sleep_state > ACPI_STATE_S0)
 717                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 718
 719         /*
 720          * If _PRW says we can wake up the system from the target sleep state,
 721          * the D-state returned by _SxD is sufficient for that (we assume a
 722          * wakeup-aware driver if wake is set).  Still, if _SxW exists
 723          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 724          * can wake the system.  _S0W may be valid, too.
 725          */
 726         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 727             (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
 728              adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
 729                 acpi_status status;
 730
 731                 acpi_method[3] = 'W';
 732                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
 733                                                 &d_max);
 734                 if (ACPI_FAILURE(status)) {
 735                         if (acpi_target_sleep_state != ACPI_STATE_S0 ||
 736                             status != AE_NOT_FOUND)
 737                                 d_max = d_min;
 738                 } else if (d_max < d_min) {
 739                         /* Warn the user of the broken DSDT */
 740                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
 741                                 acpi_method);
 742                         /* Sanitize it */
 743                         d_min = d_max;
 744                 }
 745         }
 746
 747         if (d_min_p)
 748                 *d_min_p = d_min;
 749         return d_max;
 750 }
 751 #endif /* CONFIG_PM */
 752
 753 #ifdef CONFIG_PM_SLEEP
 754 /**
 755  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
 756  *                                  capability of given device
 757  *      @dev: device to handle
 758  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
 759  */
 760 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 761 {
 762         acpi_handle handle;
 763         struct acpi_device *adev;
 764         int error;
 765
 766         if (!device_can_wakeup(dev))
 767                 return -EINVAL;
 768
 769         handle = DEVICE_ACPI_HANDLE(dev);
 770         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 771                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
 772                 return -ENODEV;
 773         }
 774
 775         error = enable ?
 776                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
 777                 acpi_disable_wakeup_device_power(adev);
 778         if (!error)
 779                 dev_info(dev, "wake-up capability %s by ACPI\n",
 780                                 enable ? "enabled" : "disabled");
 781
 782         return error;
 783 }
 784 #endif  /* CONFIG_PM_SLEEP */
 785
 786 static void acpi_power_off_prepare(void)
 787 {
 788         /* Prepare to power off the system */
 789         acpi_sleep_prepare(ACPI_STATE_S5);
 790         acpi_disable_all_gpes();
 791 }
 792
 793 static void acpi_power_off(void)
 794 {
 795         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 796         printk(KERN_DEBUG "%s called\n", __func__);
 797         local_irq_disable();
 798         acpi_enter_sleep_state(ACPI_STATE_S5);
 799 }
 800
 801 /*
 802  * ACPI 2.0 created the optional _GTS and _BFS,
 803  * but industry adoption has been neither rapid nor broad.
 804  *
 805  * Linux gets into trouble when it executes poorly validated
 806  * paths through the BIOS, so disable _GTS and _BFS by default,
 807  * but do speak up and offer the option to enable them.
 808  */
 809 static void __init acpi_gts_bfs_check(void)
 810 {
 811         acpi_handle dummy;
 812
 813         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
 814         {
 815                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
 816                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
 817                         "please notify linux-acpi@vger.kernel.org\n");
 818         }
 819         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
 820         {
 821                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
 822                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
 823                         "please notify linux-acpi@vger.kernel.org\n");
 824         }
 825 }
 826
 827 int __init acpi_sleep_init(void)
 828 {
 829         acpi_status status;
 830         u8 type_a, type_b;
 831 #ifdef CONFIG_SUSPEND
 832         int i = 0;
 833 #endif
 834
 835         if (acpi_disabled)
 836                 return 0;
 837
 838         acpi_sleep_dmi_check();
 839
 840         sleep_states[ACPI_STATE_S0] = 1;
 841         printk(KERN_INFO PREFIX "(supports S0");
 842
 843 #ifdef CONFIG_SUSPEND
 844         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 845                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 846                 if (ACPI_SUCCESS(status)) {
 847                         sleep_states[i] = 1;
 848                         printk(" S%d", i);
 849                 }
 850         }
 851
 852         suspend_set_ops(old_suspend_ordering ?
 853                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 854 #endif
 855
 856 #ifdef CONFIG_HIBERNATION
 857         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 858         if (ACPI_SUCCESS(status)) {
 859                 hibernation_set_ops(old_suspend_ordering ?
 860                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 861                 sleep_states[ACPI_STATE_S4] = 1;
 862                 printk(" S4");
 863                 if (!nosigcheck) {
 864                         acpi_get_table(ACPI_SIG_FACS, 1,
 865                                 (struct acpi_table_header **)&facs);
 866                         if (facs)
 867                                 s4_hardware_signature =
 868                                         facs->hardware_signature;
 869                 }
 870         }
 871 #endif
 872         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 873         if (ACPI_SUCCESS(status)) {
 874                 sleep_states[ACPI_STATE_S5] = 1;
 875                 printk(" S5");
 876                 pm_power_off_prepare = acpi_power_off_prepare;
 877                 pm_power_off = acpi_power_off;
 878         }
 879         printk(")\n");
 880         /*
 881          * Register the tts_notifier to reboot notifier list so that the _TTS
 882          * object can also be evaluated when the system enters S5.
 883          */
 884         register_reboot_notifier(&tts_notifier);
 885         acpi_gts_bfs_check();
 886         return 0;
 887 }