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 #include <linux/module.h>
  21 #include <linux/pm_runtime.h>
  22
  23 #include <asm/io.h>
  24
  25 #include <acpi/acpi_bus.h>
  26 #include <acpi/acpi_drivers.h>
  27
  28 #include "internal.h"
  29 #include "sleep.h"
  30
  31 static unsigned int gts, bfs;
  32 module_param(gts, uint, 0644);
  33 module_param(bfs, uint, 0644);
  34 MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
  35 MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
  36
  37 static u8 wake_sleep_flags(void)
  38 {
  39         u8 flags = ACPI_NO_OPTIONAL_METHODS;
  40
  41         if (gts)
  42                 flags |= ACPI_EXECUTE_GTS;
  43         if (bfs)
  44                 flags |= ACPI_EXECUTE_BFS;
  45
  46         return flags;
  47 }
  48
  49 static u8 sleep_states[ACPI_S_STATE_COUNT];
  50
  51 static void acpi_sleep_tts_switch(u32 acpi_state)
  52 {
  53         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  54         struct acpi_object_list arg_list = { 1, &in_arg };
  55         acpi_status status = AE_OK;
  56
  57         in_arg.integer.value = acpi_state;
  58         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  59         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  60                 /*
  61                  * OS can't evaluate the _TTS object correctly. Some warning
  62                  * message will be printed. But it won't break anything.
  63                  */
  64                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  65         }
  66 }
  67
  68 static int tts_notify_reboot(struct notifier_block *this,
  69                         unsigned long code, void *x)
  70 {
  71         acpi_sleep_tts_switch(ACPI_STATE_S5);
  72         return NOTIFY_DONE;
  73 }
  74
  75 static struct notifier_block tts_notifier = {
  76         .notifier_call  = tts_notify_reboot,
  77         .next           = NULL,
  78         .priority       = 0,
  79 };
  80
  81 static int acpi_sleep_prepare(u32 acpi_state)
  82 {
  83 #ifdef CONFIG_ACPI_SLEEP
  84         /* do we have a wakeup address for S2 and S3? */
  85         if (acpi_state == ACPI_STATE_S3) {
  86                 if (!acpi_wakeup_address) {
  87                         return -EFAULT;
  88                 }
  89                 acpi_set_firmware_waking_vector(
  90                                 (acpi_physical_address)acpi_wakeup_address);
  91
  92         }
  93         ACPI_FLUSH_CPU_CACHE();
  94 #endif
  95         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  96                 acpi_state);
  97         acpi_enable_wakeup_devices(acpi_state);
  98         acpi_enter_sleep_state_prep(acpi_state);
  99         return 0;
 100 }
 101
 102 #ifdef CONFIG_ACPI_SLEEP
 103 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
 104
 105 /*
 106  * The ACPI specification wants us to save NVS memory regions during hibernation
 107  * and to restore them during the subsequent resume.  Windows does that also for
 108  * suspend to RAM.  However, it is known that this mechanism does not work on
 109  * all machines, so we allow the user to disable it with the help of the
 110  * 'acpi_sleep=nonvs' kernel command line option.
 111  */
 112 static bool nvs_nosave;
 113
 114 void __init acpi_nvs_nosave(void)
 115 {
 116         nvs_nosave = true;
 117 }
 118
 119 /*
 120  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 121  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 122  * kernel command line option that causes the following variable to be set.
 123  */
 124 static bool old_suspend_ordering;
 125
 126 void __init acpi_old_suspend_ordering(void)
 127 {
 128         old_suspend_ordering = true;
 129 }
 130
 131 /**
 132  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 133  */
 134 static int acpi_pm_freeze(void)
 135 {
 136         acpi_disable_all_gpes();
 137         acpi_os_wait_events_complete(NULL);
 138         acpi_ec_block_transactions();
 139         return 0;
 140 }
 141
 142 /**
 143  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 144  */
 145 static int acpi_pm_pre_suspend(void)
 146 {
 147         acpi_pm_freeze();
 148         return suspend_nvs_save();
 149 }
 150
 151 /**
 152  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 153  *
 154  *      If necessary, set the firmware waking vector and do arch-specific
 155  *      nastiness to get the wakeup code to the waking vector.
 156  */
 157 static int __acpi_pm_prepare(void)
 158 {
 159         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 160         if (error)
 161                 acpi_target_sleep_state = ACPI_STATE_S0;
 162
 163         return error;
 164 }
 165
 166 /**
 167  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 168  *              state and disable the GPEs.
 169  */
 170 static int acpi_pm_prepare(void)
 171 {
 172         int error = __acpi_pm_prepare();
 173         if (!error)
 174                 error = acpi_pm_pre_suspend();
 175
 176         return error;
 177 }
 178
 179 /**
 180  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 181  *
 182  *      This is called after we wake back up (or if entering the sleep state
 183  *      failed).
 184  */
 185 static void acpi_pm_finish(void)
 186 {
 187         u32 acpi_state = acpi_target_sleep_state;
 188
 189         acpi_ec_unblock_transactions();
 190         suspend_nvs_free();
 191
 192         if (acpi_state == ACPI_STATE_S0)
 193                 return;
 194
 195         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 196                 acpi_state);
 197         acpi_disable_wakeup_devices(acpi_state);
 198         acpi_leave_sleep_state(acpi_state);
 199
 200         /* reset firmware waking vector */
 201         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 202
 203         acpi_target_sleep_state = ACPI_STATE_S0;
 204 }
 205
 206 /**
 207  *      acpi_pm_end - Finish up suspend sequence.
 208  */
 209 static void acpi_pm_end(void)
 210 {
 211         /*
 212          * This is necessary in case acpi_pm_finish() is not called during a
 213          * failing transition to a sleep state.
 214          */
 215         acpi_target_sleep_state = ACPI_STATE_S0;
 216         acpi_sleep_tts_switch(acpi_target_sleep_state);
 217 }
 218 #else /* !CONFIG_ACPI_SLEEP */
 219 #define acpi_target_sleep_state ACPI_STATE_S0
 220 #endif /* CONFIG_ACPI_SLEEP */
 221
 222 #ifdef CONFIG_SUSPEND
 223 static u32 acpi_suspend_states[] = {
 224         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 225         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 226         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 227         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 228 };
 229
 230 /**
 231  *      acpi_suspend_begin - Set the target system sleep state to the state
 232  *              associated with given @pm_state, if supported.
 233  */
 234 static int acpi_suspend_begin(suspend_state_t pm_state)
 235 {
 236         u32 acpi_state = acpi_suspend_states[pm_state];
 237         int error = 0;
 238
 239         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 240         if (error)
 241                 return error;
 242
 243         if (sleep_states[acpi_state]) {
 244                 acpi_target_sleep_state = acpi_state;
 245                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 246         } else {
 247                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 248                         pm_state);
 249                 error = -ENOSYS;
 250         }
 251         return error;
 252 }
 253
 254 /**
 255  *      acpi_suspend_enter - Actually enter a sleep state.
 256  *      @pm_state: ignored
 257  *
 258  *      Flush caches and go to sleep. For STR we have to call arch-specific
 259  *      assembly, which in turn call acpi_enter_sleep_state().
 260  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 261  */
 262 static int acpi_suspend_enter(suspend_state_t pm_state)
 263 {
 264         acpi_status status = AE_OK;
 265         u32 acpi_state = acpi_target_sleep_state;
 266         u8 flags = wake_sleep_flags();
 267         int error;
 268
 269         ACPI_FLUSH_CPU_CACHE();
 270
 271         switch (acpi_state) {
 272         case ACPI_STATE_S1:
 273                 barrier();
 274                 status = acpi_enter_sleep_state(acpi_state, flags);
 275                 break;
 276
 277         case ACPI_STATE_S3:
 278                 error = acpi_suspend_lowlevel();
 279                 if (error)
 280                         return error;
 281                 pr_info(PREFIX "Low-level resume complete\n");
 282                 break;
 283         }
 284
 285         /* This violates the spec but is required for bug compatibility. */
 286         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 287
 288         /* Reprogram control registers and execute _BFS */
 289         acpi_leave_sleep_state_prep(acpi_state, flags);
 290
 291         /* ACPI 3.0 specs (P62) says that it's the responsibility
 292          * of the OSPM to clear the status bit [ implying that the
 293          * POWER_BUTTON event should not reach userspace ]
 294          */
 295         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 296                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 297
 298         /*
 299          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 300          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 301          * acpi_leave_sleep_state will reenable specific GPEs later
 302          */
 303         acpi_disable_all_gpes();
 304         /* Allow EC transactions to happen. */
 305         acpi_ec_unblock_transactions_early();
 306
 307         suspend_nvs_restore();
 308
 309         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 310 }
 311
 312 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 313 {
 314         u32 acpi_state;
 315
 316         switch (pm_state) {
 317         case PM_SUSPEND_ON:
 318         case PM_SUSPEND_STANDBY:
 319         case PM_SUSPEND_MEM:
 320                 acpi_state = acpi_suspend_states[pm_state];
 321
 322                 return sleep_states[acpi_state];
 323         default:
 324                 return 0;
 325         }
 326 }
 327
 328 static const struct platform_suspend_ops acpi_suspend_ops = {
 329         .valid = acpi_suspend_state_valid,
 330         .begin = acpi_suspend_begin,
 331         .prepare_late = acpi_pm_prepare,
 332         .enter = acpi_suspend_enter,
 333         .wake = acpi_pm_finish,
 334         .end = acpi_pm_end,
 335 };
 336
 337 /**
 338  *      acpi_suspend_begin_old - Set the target system sleep state to the
 339  *              state associated with given @pm_state, if supported, and
 340  *              execute the _PTS control method.  This function is used if the
 341  *              pre-ACPI 2.0 suspend ordering has been requested.
 342  */
 343 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 344 {
 345         int error = acpi_suspend_begin(pm_state);
 346         if (!error)
 347                 error = __acpi_pm_prepare();
 348
 349         return error;
 350 }
 351
 352 /*
 353  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 354  * been requested.
 355  */
 356 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 357         .valid = acpi_suspend_state_valid,
 358         .begin = acpi_suspend_begin_old,
 359         .prepare_late = acpi_pm_pre_suspend,
 360         .enter = acpi_suspend_enter,
 361         .wake = acpi_pm_finish,
 362         .end = acpi_pm_end,
 363         .recover = acpi_pm_finish,
 364 };
 365
 366 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 367 {
 368         old_suspend_ordering = true;
 369         return 0;
 370 }
 371
 372 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 373 {
 374         acpi_nvs_nosave();
 375         return 0;
 376 }
 377
 378 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 379         {
 380         .callback = init_old_suspend_ordering,
 381         .ident = "Abit KN9 (nForce4 variant)",
 382         .matches = {
 383                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 384                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 385                 },
 386         },
 387         {
 388         .callback = init_old_suspend_ordering,
 389         .ident = "HP xw4600 Workstation",
 390         .matches = {
 391                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 392                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 393                 },
 394         },
 395         {
 396         .callback = init_old_suspend_ordering,
 397         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 398         .matches = {
 399                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 400                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 401                 },
 402         },
 403         {
 404         .callback = init_old_suspend_ordering,
 405         .ident = "Panasonic CF51-2L",
 406         .matches = {
 407                 DMI_MATCH(DMI_BOARD_VENDOR,
 408                                 "Matsushita Electric Industrial Co.,Ltd."),
 409                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 410                 },
 411         },
 412         {
 413         .callback = init_nvs_nosave,
 414         .ident = "Sony Vaio VGN-FW21E",
 415         .matches = {
 416                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 417                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 418                 },
 419         },
 420         {
 421         .callback = init_nvs_nosave,
 422         .ident = "Sony Vaio VPCEB17FX",
 423         .matches = {
 424                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 425                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 426                 },
 427         },
 428         {
 429         .callback = init_nvs_nosave,
 430         .ident = "Sony Vaio VGN-SR11M",
 431         .matches = {
 432                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 433                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 434                 },
 435         },
 436         {
 437         .callback = init_nvs_nosave,
 438         .ident = "Everex StepNote Series",
 439         .matches = {
 440                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 441                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 442                 },
 443         },
 444         {
 445         .callback = init_nvs_nosave,
 446         .ident = "Sony Vaio VPCEB1Z1E",
 447         .matches = {
 448                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 449                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 450                 },
 451         },
 452         {
 453         .callback = init_nvs_nosave,
 454         .ident = "Sony Vaio VGN-NW130D",
 455         .matches = {
 456                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 457                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 458                 },
 459         },
 460         {
 461         .callback = init_nvs_nosave,
 462         .ident = "Sony Vaio VPCCW29FX",
 463         .matches = {
 464                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 465                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 466                 },
 467         },
 468         {
 469         .callback = init_nvs_nosave,
 470         .ident = "Averatec AV1020-ED2",
 471         .matches = {
 472                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 473                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 474                 },
 475         },
 476         {
 477         .callback = init_old_suspend_ordering,
 478         .ident = "Asus A8N-SLI DELUXE",
 479         .matches = {
 480                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 481                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 482                 },
 483         },
 484         {
 485         .callback = init_old_suspend_ordering,
 486         .ident = "Asus A8N-SLI Premium",
 487         .matches = {
 488                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 489                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 490                 },
 491         },
 492         {
 493         .callback = init_nvs_nosave,
 494         .ident = "Sony Vaio VGN-SR26GN_P",
 495         .matches = {
 496                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 497                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 498                 },
 499         },
 500         {
 501         .callback = init_nvs_nosave,
 502         .ident = "Sony Vaio VGN-FW520F",
 503         .matches = {
 504                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 505                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 506                 },
 507         },
 508         {
 509         .callback = init_nvs_nosave,
 510         .ident = "Asus K54C",
 511         .matches = {
 512                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 513                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 514                 },
 515         },
 516         {
 517         .callback = init_nvs_nosave,
 518         .ident = "Asus K54HR",
 519         .matches = {
 520                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 521                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 522                 },
 523         },
 524         {},
 525 };
 526 #endif /* CONFIG_SUSPEND */
 527
 528 #ifdef CONFIG_HIBERNATION
 529 static unsigned long s4_hardware_signature;
 530 static struct acpi_table_facs *facs;
 531 static bool nosigcheck;
 532
 533 void __init acpi_no_s4_hw_signature(void)
 534 {
 535         nosigcheck = true;
 536 }
 537
 538 static int acpi_hibernation_begin(void)
 539 {
 540         int error;
 541
 542         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 543         if (!error) {
 544                 acpi_target_sleep_state = ACPI_STATE_S4;
 545                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 546         }
 547
 548         return error;
 549 }
 550
 551 static int acpi_hibernation_enter(void)
 552 {
 553         u8 flags = wake_sleep_flags();
 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, flags);
 560         /* Reprogram control registers and execute _BFS */
 561         acpi_leave_sleep_state_prep(ACPI_STATE_S4, flags);
 562
 563         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 564 }
 565
 566 static void acpi_hibernation_leave(void)
 567 {
 568         u8 flags = wake_sleep_flags();
 569
 570         /*
 571          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 572          * enable it here.
 573          */
 574         acpi_enable();
 575         /* Reprogram control registers and execute _BFS */
 576         acpi_leave_sleep_state_prep(ACPI_STATE_S4, flags);
 577         /* Check the hardware signature */
 578         if (facs && s4_hardware_signature != facs->hardware_signature) {
 579                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 580                         "cannot resume!\n");
 581                 panic("ACPI S4 hardware signature mismatch");
 582         }
 583         /* Restore the NVS memory area */
 584         suspend_nvs_restore();
 585         /* Allow EC transactions to happen. */
 586         acpi_ec_unblock_transactions_early();
 587 }
 588
 589 static void acpi_pm_thaw(void)
 590 {
 591         acpi_ec_unblock_transactions();
 592         acpi_enable_all_runtime_gpes();
 593 }
 594
 595 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 596         .begin = acpi_hibernation_begin,
 597         .end = acpi_pm_end,
 598         .pre_snapshot = acpi_pm_prepare,
 599         .finish = acpi_pm_finish,
 600         .prepare = acpi_pm_prepare,
 601         .enter = acpi_hibernation_enter,
 602         .leave = acpi_hibernation_leave,
 603         .pre_restore = acpi_pm_freeze,
 604         .restore_cleanup = acpi_pm_thaw,
 605 };
 606
 607 /**
 608  *      acpi_hibernation_begin_old - Set the target system sleep state to
 609  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 610  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 611  *              requested.
 612  */
 613 static int acpi_hibernation_begin_old(void)
 614 {
 615         int error;
 616         /*
 617          * The _TTS object should always be evaluated before the _PTS object.
 618          * When the old_suspended_ordering is true, the _PTS object is
 619          * evaluated in the acpi_sleep_prepare.
 620          */
 621         acpi_sleep_tts_switch(ACPI_STATE_S4);
 622
 623         error = acpi_sleep_prepare(ACPI_STATE_S4);
 624
 625         if (!error) {
 626                 if (!nvs_nosave)
 627                         error = suspend_nvs_alloc();
 628                 if (!error)
 629                         acpi_target_sleep_state = ACPI_STATE_S4;
 630         }
 631         return error;
 632 }
 633
 634 /*
 635  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 636  * been requested.
 637  */
 638 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 639         .begin = acpi_hibernation_begin_old,
 640         .end = acpi_pm_end,
 641         .pre_snapshot = acpi_pm_pre_suspend,
 642         .prepare = acpi_pm_freeze,
 643         .finish = acpi_pm_finish,
 644         .enter = acpi_hibernation_enter,
 645         .leave = acpi_hibernation_leave,
 646         .pre_restore = acpi_pm_freeze,
 647         .restore_cleanup = acpi_pm_thaw,
 648         .recover = acpi_pm_finish,
 649 };
 650 #endif /* CONFIG_HIBERNATION */
 651
 652 int acpi_suspend(u32 acpi_state)
 653 {
 654         suspend_state_t states[] = {
 655                 [1] = PM_SUSPEND_STANDBY,
 656                 [3] = PM_SUSPEND_MEM,
 657                 [5] = PM_SUSPEND_MAX
 658         };
 659
 660         if (acpi_state < 6 && states[acpi_state])
 661                 return pm_suspend(states[acpi_state]);
 662         if (acpi_state == 4)
 663                 return hibernate();
 664         return -EINVAL;
 665 }
 666
 667 #ifdef CONFIG_PM
 668 /**
 669  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 670  *              in the system sleep state given by %acpi_target_sleep_state
 671  *      @dev: device to examine; its driver model wakeup flags control
 672  *              whether it should be able to wake up the system
 673  *      @d_min_p: used to store the upper limit of allowed states range
 674  *      Return value: preferred power state of the device on success, -ENODEV on
 675  *              failure (ie. if there's no 'struct acpi_device' for @dev)
 676  *
 677  *      Find the lowest power (highest number) ACPI device power state that
 678  *      device @dev can be in while the system is in the sleep state represented
 679  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 680  *      able to wake up the system from this sleep state.  If @d_min_p is set,
 681  *      the highest power (lowest number) device power state of @dev allowed
 682  *      in this system sleep state is stored at the location pointed to by it.
 683  *
 684  *      The caller must ensure that @dev is valid before using this function.
 685  *      The caller is also responsible for figuring out if the device is
 686  *      supposed to be able to wake up the system and passing this information
 687  *      via @wake.
 688  */
 689
 690 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
 691 {
 692         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 693         struct acpi_device *adev;
 694         char acpi_method[] = "_SxD";
 695         unsigned long long d_min, d_max;
 696
 697         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 698                 printk(KERN_DEBUG "ACPI handle has no context!\n");
 699                 return -ENODEV;
 700         }
 701
 702         acpi_method[2] = '0' + acpi_target_sleep_state;
 703         /*
 704          * If the sleep state is S0, we will return D3, but if the device has
 705          * _S0W, we will use the value from _S0W
 706          */
 707         d_min = ACPI_STATE_D0;
 708         d_max = ACPI_STATE_D3;
 709
 710         /*
 711          * If present, _SxD methods return the minimum D-state (highest power
 712          * state) we can use for the corresponding S-states.  Otherwise, the
 713          * minimum D-state is D0 (ACPI 3.x).
 714          *
 715          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 716          * provided -- that's our fault recovery, we ignore retval.
 717          */
 718         if (acpi_target_sleep_state > ACPI_STATE_S0)
 719                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 720
 721         /*
 722          * If _PRW says we can wake up the system from the target sleep state,
 723          * the D-state returned by _SxD is sufficient for that (we assume a
 724          * wakeup-aware driver if wake is set).  Still, if _SxW exists
 725          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 726          * can wake the system.  _S0W may be valid, too.
 727          */
 728         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 729             (device_may_wakeup(dev) &&
 730              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
 731                 acpi_status status;
 732
 733                 acpi_method[3] = 'W';
 734                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
 735                                                 &d_max);
 736                 if (ACPI_FAILURE(status)) {
 737                         if (acpi_target_sleep_state != ACPI_STATE_S0 ||
 738                             status != AE_NOT_FOUND)
 739                                 d_max = d_min;
 740                 } else if (d_max < d_min) {
 741                         /* Warn the user of the broken DSDT */
 742                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
 743                                 acpi_method);
 744                         /* Sanitize it */
 745                         d_min = d_max;
 746                 }
 747         }
 748
 749         if (d_min_p)
 750                 *d_min_p = d_min;
 751         return d_max;
 752 }
 753 #endif /* CONFIG_PM */
 754
 755 #ifdef CONFIG_PM_SLEEP
 756 /**
 757  * acpi_pm_device_run_wake - Enable/disable wake-up for given device.
 758  * @phys_dev: Device to enable/disable the platform to wake-up the system for.
 759  * @enable: Whether enable or disable the wake-up functionality.
 760  *
 761  * Find the ACPI device object corresponding to @pci_dev and try to
 762  * enable/disable the GPE associated with it.
 763  */
 764 int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
 765 {
 766         struct acpi_device *dev;
 767         acpi_handle handle;
 768
 769         if (!device_run_wake(phys_dev))
 770                 return -EINVAL;
 771
 772         handle = DEVICE_ACPI_HANDLE(phys_dev);
 773         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
 774                 dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
 775                         __func__);
 776                 return -ENODEV;
 777         }
 778
 779         if (enable) {
 780                 acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
 781                 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
 782         } else {
 783                 acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
 784                 acpi_disable_wakeup_device_power(dev);
 785         }
 786
 787         return 0;
 788 }
 789
 790 /**
 791  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
 792  *                                  capability of given device
 793  *      @dev: device to handle
 794  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
 795  */
 796 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 797 {
 798         acpi_handle handle;
 799         struct acpi_device *adev;
 800         int error;
 801
 802         if (!device_can_wakeup(dev))
 803                 return -EINVAL;
 804
 805         handle = DEVICE_ACPI_HANDLE(dev);
 806         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 807                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
 808                 return -ENODEV;
 809         }
 810
 811         error = enable ?
 812                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
 813                 acpi_disable_wakeup_device_power(adev);
 814         if (!error)
 815                 dev_info(dev, "wake-up capability %s by ACPI\n",
 816                                 enable ? "enabled" : "disabled");
 817
 818         return error;
 819 }
 820 #endif  /* CONFIG_PM_SLEEP */
 821
 822 static void acpi_power_off_prepare(void)
 823 {
 824         /* Prepare to power off the system */
 825         acpi_sleep_prepare(ACPI_STATE_S5);
 826         acpi_disable_all_gpes();
 827 }
 828
 829 static void acpi_power_off(void)
 830 {
 831         u8 flags = wake_sleep_flags();
 832
 833         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 834         printk(KERN_DEBUG "%s called\n", __func__);
 835         local_irq_disable();
 836         acpi_enter_sleep_state(ACPI_STATE_S5, flags);
 837 }
 838
 839 /*
 840  * ACPI 2.0 created the optional _GTS and _BFS,
 841  * but industry adoption has been neither rapid nor broad.
 842  *
 843  * Linux gets into trouble when it executes poorly validated
 844  * paths through the BIOS, so disable _GTS and _BFS by default,
 845  * but do speak up and offer the option to enable them.
 846  */
 847 static void __init acpi_gts_bfs_check(void)
 848 {
 849         acpi_handle dummy;
 850
 851         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_PATHNAME__GTS, &dummy)))
 852         {
 853                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
 854                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
 855                         "please notify linux-acpi@vger.kernel.org\n");
 856         }
 857         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_PATHNAME__BFS, &dummy)))
 858         {
 859                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
 860                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
 861                         "please notify linux-acpi@vger.kernel.org\n");
 862         }
 863 }
 864
 865 int __init acpi_sleep_init(void)
 866 {
 867         acpi_status status;
 868         u8 type_a, type_b;
 869 #ifdef CONFIG_SUSPEND
 870         int i = 0;
 871
 872         dmi_check_system(acpisleep_dmi_table);
 873 #endif
 874
 875         if (acpi_disabled)
 876                 return 0;
 877
 878         sleep_states[ACPI_STATE_S0] = 1;
 879         printk(KERN_INFO PREFIX "(supports S0");
 880
 881 #ifdef CONFIG_SUSPEND
 882         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 883                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 884                 if (ACPI_SUCCESS(status)) {
 885                         sleep_states[i] = 1;
 886                         printk(" S%d", i);
 887                 }
 888         }
 889
 890         suspend_set_ops(old_suspend_ordering ?
 891                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 892 #endif
 893
 894 #ifdef CONFIG_HIBERNATION
 895         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 896         if (ACPI_SUCCESS(status)) {
 897                 hibernation_set_ops(old_suspend_ordering ?
 898                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 899                 sleep_states[ACPI_STATE_S4] = 1;
 900                 printk(" S4");
 901                 if (!nosigcheck) {
 902                         acpi_get_table(ACPI_SIG_FACS, 1,
 903                                 (struct acpi_table_header **)&facs);
 904                         if (facs)
 905                                 s4_hardware_signature =
 906                                         facs->hardware_signature;
 907                 }
 908         }
 909 #endif
 910         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 911         if (ACPI_SUCCESS(status)) {
 912                 sleep_states[ACPI_STATE_S5] = 1;
 913                 printk(" S5");
 914                 pm_power_off_prepare = acpi_power_off_prepare;
 915                 pm_power_off = acpi_power_off;
 916         }
 917         printk(")\n");
 918         /*
 919          * Register the tts_notifier to reboot notifier list so that the _TTS
 920          * object can also be evaluated when the system enters S5.
 921          */
 922         register_reboot_notifier(&tts_notifier);
 923         acpi_gts_bfs_check();
 924         return 0;
 925 }