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
  22 #include <asm/io.h>
  23
  24 #include <acpi/acpi_bus.h>
  25 #include <acpi/acpi_drivers.h>
  26
  27 #include "internal.h"
  28 #include "sleep.h"
  29
  30 static u8 sleep_states[ACPI_S_STATE_COUNT];
  31
  32 static void acpi_sleep_tts_switch(u32 acpi_state)
  33 {
  34         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  35         struct acpi_object_list arg_list = { 1, &in_arg };
  36         acpi_status status = AE_OK;
  37
  38         in_arg.integer.value = acpi_state;
  39         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  40         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  41                 /*
  42                  * OS can't evaluate the _TTS object correctly. Some warning
  43                  * message will be printed. But it won't break anything.
  44                  */
  45                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  46         }
  47 }
  48
  49 static int tts_notify_reboot(struct notifier_block *this,
  50                         unsigned long code, void *x)
  51 {
  52         acpi_sleep_tts_switch(ACPI_STATE_S5);
  53         return NOTIFY_DONE;
  54 }
  55
  56 static struct notifier_block tts_notifier = {
  57         .notifier_call  = tts_notify_reboot,
  58         .next           = NULL,
  59         .priority       = 0,
  60 };
  61
  62 static int acpi_sleep_prepare(u32 acpi_state)
  63 {
  64 #ifdef CONFIG_ACPI_SLEEP
  65         /* do we have a wakeup address for S2 and S3? */
  66         if (acpi_state == ACPI_STATE_S3) {
  67                 if (!acpi_wakeup_address)
  68                         return -EFAULT;
  69                 acpi_set_firmware_waking_vector(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 u32 acpi_target_system_state(void)
  85 {
  86         return acpi_target_sleep_state;
  87 }
  88
  89 static bool pwr_btn_event_pending;
  90
  91 /*
  92  * The ACPI specification wants us to save NVS memory regions during hibernation
  93  * and to restore them during the subsequent resume.  Windows does that also for
  94  * suspend to RAM.  However, it is known that this mechanism does not work on
  95  * all machines, so we allow the user to disable it with the help of the
  96  * 'acpi_sleep=nonvs' kernel command line option.
  97  */
  98 static bool nvs_nosave;
  99
 100 void __init acpi_nvs_nosave(void)
 101 {
 102         nvs_nosave = true;
 103 }
 104
 105 /*
 106  * The ACPI specification wants us to save NVS memory regions during hibernation
 107  * but says nothing about saving NVS during S3.  Not all versions of Windows
 108  * save NVS on S3 suspend either, and it is clear that not all systems need
 109  * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
 110  * user to disable saving NVS on S3 if their system does not require it, but
 111  * continue to save/restore NVS for S4 as specified.
 112  */
 113 static bool nvs_nosave_s3;
 114
 115 void __init acpi_nvs_nosave_s3(void)
 116 {
 117         nvs_nosave_s3 = true;
 118 }
 119
 120 /*
 121  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 122  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 123  * kernel command line option that causes the following variable to be set.
 124  */
 125 static bool old_suspend_ordering;
 126
 127 void __init acpi_old_suspend_ordering(void)
 128 {
 129         old_suspend_ordering = true;
 130 }
 131
 132 /**
 133  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 134  */
 135 static int acpi_pm_freeze(void)
 136 {
 137         acpi_disable_all_gpes();
 138         acpi_os_wait_events_complete();
 139         acpi_ec_block_transactions();
 140         return 0;
 141 }
 142
 143 /**
 144  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 145  */
 146 static int acpi_pm_pre_suspend(void)
 147 {
 148         acpi_pm_freeze();
 149         return suspend_nvs_save();
 150 }
 151
 152 /**
 153  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 154  *
 155  *      If necessary, set the firmware waking vector and do arch-specific
 156  *      nastiness to get the wakeup code to the waking vector.
 157  */
 158 static int __acpi_pm_prepare(void)
 159 {
 160         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 161         if (error)
 162                 acpi_target_sleep_state = ACPI_STATE_S0;
 163
 164         return error;
 165 }
 166
 167 /**
 168  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 169  *              state and disable the GPEs.
 170  */
 171 static int acpi_pm_prepare(void)
 172 {
 173         int error = __acpi_pm_prepare();
 174         if (!error)
 175                 error = acpi_pm_pre_suspend();
 176
 177         return error;
 178 }
 179
 180 static int find_powerf_dev(struct device *dev, void *data)
 181 {
 182         struct acpi_device *device = to_acpi_device(dev);
 183         const char *hid = acpi_device_hid(device);
 184
 185         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
 186 }
 187
 188 /**
 189  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 190  *
 191  *      This is called after we wake back up (or if entering the sleep state
 192  *      failed).
 193  */
 194 static void acpi_pm_finish(void)
 195 {
 196         struct device *pwr_btn_dev;
 197         u32 acpi_state = acpi_target_sleep_state;
 198
 199         acpi_ec_unblock_transactions();
 200         suspend_nvs_free();
 201
 202         if (acpi_state == ACPI_STATE_S0)
 203                 return;
 204
 205         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 206                 acpi_state);
 207         acpi_disable_wakeup_devices(acpi_state);
 208         acpi_leave_sleep_state(acpi_state);
 209
 210         /* reset firmware waking vector */
 211         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 212
 213         acpi_target_sleep_state = ACPI_STATE_S0;
 214
 215         /* If we were woken with the fixed power button, provide a small
 216          * hint to userspace in the form of a wakeup event on the fixed power
 217          * button device (if it can be found).
 218          *
 219          * We delay the event generation til now, as the PM layer requires
 220          * timekeeping to be running before we generate events. */
 221         if (!pwr_btn_event_pending)
 222                 return;
 223
 224         pwr_btn_event_pending = false;
 225         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
 226                                       find_powerf_dev);
 227         if (pwr_btn_dev) {
 228                 pm_wakeup_event(pwr_btn_dev, 0);
 229                 put_device(pwr_btn_dev);
 230         }
 231 }
 232
 233 /**
 234  *      acpi_pm_end - Finish up suspend sequence.
 235  */
 236 static void acpi_pm_end(void)
 237 {
 238         /*
 239          * This is necessary in case acpi_pm_finish() is not called during a
 240          * failing transition to a sleep state.
 241          */
 242         acpi_target_sleep_state = ACPI_STATE_S0;
 243         acpi_sleep_tts_switch(acpi_target_sleep_state);
 244 }
 245 #else /* !CONFIG_ACPI_SLEEP */
 246 #define acpi_target_sleep_state ACPI_STATE_S0
 247 #endif /* CONFIG_ACPI_SLEEP */
 248
 249 #ifdef CONFIG_SUSPEND
 250 static u32 acpi_suspend_states[] = {
 251         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 252         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 253         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 254         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 255 };
 256
 257 /**
 258  *      acpi_suspend_begin - Set the target system sleep state to the state
 259  *              associated with given @pm_state, if supported.
 260  */
 261 static int acpi_suspend_begin(suspend_state_t pm_state)
 262 {
 263         u32 acpi_state = acpi_suspend_states[pm_state];
 264         int error = 0;
 265
 266         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 267         if (error)
 268                 return error;
 269
 270         if (sleep_states[acpi_state]) {
 271                 acpi_target_sleep_state = acpi_state;
 272                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 273         } else {
 274                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 275                         pm_state);
 276                 error = -ENOSYS;
 277         }
 278         return error;
 279 }
 280
 281 /**
 282  *      acpi_suspend_enter - Actually enter a sleep state.
 283  *      @pm_state: ignored
 284  *
 285  *      Flush caches and go to sleep. For STR we have to call arch-specific
 286  *      assembly, which in turn call acpi_enter_sleep_state().
 287  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 288  */
 289 static int acpi_suspend_enter(suspend_state_t pm_state)
 290 {
 291         acpi_status status = AE_OK;
 292         u32 acpi_state = acpi_target_sleep_state;
 293         int error;
 294
 295         ACPI_FLUSH_CPU_CACHE();
 296
 297         switch (acpi_state) {
 298         case ACPI_STATE_S1:
 299                 barrier();
 300                 status = acpi_enter_sleep_state(acpi_state);
 301                 break;
 302
 303         case ACPI_STATE_S3:
 304                 error = acpi_suspend_lowlevel();
 305                 if (error)
 306                         return error;
 307                 pr_info(PREFIX "Low-level resume complete\n");
 308                 break;
 309         }
 310
 311         /* This violates the spec but is required for bug compatibility. */
 312         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 313
 314         /* Reprogram control registers */
 315         acpi_leave_sleep_state_prep(acpi_state);
 316
 317         /* ACPI 3.0 specs (P62) says that it's the responsibility
 318          * of the OSPM to clear the status bit [ implying that the
 319          * POWER_BUTTON event should not reach userspace ]
 320          *
 321          * However, we do generate a small hint for userspace in the form of
 322          * a wakeup event. We flag this condition for now and generate the
 323          * event later, as we're currently too early in resume to be able to
 324          * generate wakeup events.
 325          */
 326         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 327                 acpi_event_status pwr_btn_status;
 328
 329                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 330
 331                 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
 332                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 333                         /* Flag for later */
 334                         pwr_btn_event_pending = true;
 335                 }
 336         }
 337
 338         /*
 339          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 340          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 341          * acpi_leave_sleep_state will reenable specific GPEs later
 342          */
 343         acpi_disable_all_gpes();
 344         /* Allow EC transactions to happen. */
 345         acpi_ec_unblock_transactions_early();
 346
 347         suspend_nvs_restore();
 348
 349         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 350 }
 351
 352 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 353 {
 354         u32 acpi_state;
 355
 356         switch (pm_state) {
 357         case PM_SUSPEND_ON:
 358         case PM_SUSPEND_STANDBY:
 359         case PM_SUSPEND_MEM:
 360                 acpi_state = acpi_suspend_states[pm_state];
 361
 362                 return sleep_states[acpi_state];
 363         default:
 364                 return 0;
 365         }
 366 }
 367
 368 static const struct platform_suspend_ops acpi_suspend_ops = {
 369         .valid = acpi_suspend_state_valid,
 370         .begin = acpi_suspend_begin,
 371         .prepare_late = acpi_pm_prepare,
 372         .enter = acpi_suspend_enter,
 373         .wake = acpi_pm_finish,
 374         .end = acpi_pm_end,
 375 };
 376
 377 /**
 378  *      acpi_suspend_begin_old - Set the target system sleep state to the
 379  *              state associated with given @pm_state, if supported, and
 380  *              execute the _PTS control method.  This function is used if the
 381  *              pre-ACPI 2.0 suspend ordering has been requested.
 382  */
 383 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 384 {
 385         int error = acpi_suspend_begin(pm_state);
 386         if (!error)
 387                 error = __acpi_pm_prepare();
 388
 389         return error;
 390 }
 391
 392 /*
 393  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 394  * been requested.
 395  */
 396 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 397         .valid = acpi_suspend_state_valid,
 398         .begin = acpi_suspend_begin_old,
 399         .prepare_late = acpi_pm_pre_suspend,
 400         .enter = acpi_suspend_enter,
 401         .wake = acpi_pm_finish,
 402         .end = acpi_pm_end,
 403         .recover = acpi_pm_finish,
 404 };
 405
 406 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 407 {
 408         old_suspend_ordering = true;
 409         return 0;
 410 }
 411
 412 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 413 {
 414         acpi_nvs_nosave();
 415         return 0;
 416 }
 417
 418 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 419         {
 420         .callback = init_old_suspend_ordering,
 421         .ident = "Abit KN9 (nForce4 variant)",
 422         .matches = {
 423                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 424                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 425                 },
 426         },
 427         {
 428         .callback = init_old_suspend_ordering,
 429         .ident = "HP xw4600 Workstation",
 430         .matches = {
 431                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 432                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 433                 },
 434         },
 435         {
 436         .callback = init_old_suspend_ordering,
 437         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 438         .matches = {
 439                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 440                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 441                 },
 442         },
 443         {
 444         .callback = init_old_suspend_ordering,
 445         .ident = "Panasonic CF51-2L",
 446         .matches = {
 447                 DMI_MATCH(DMI_BOARD_VENDOR,
 448                                 "Matsushita Electric Industrial Co.,Ltd."),
 449                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 450                 },
 451         },
 452         {
 453         .callback = init_nvs_nosave,
 454         .ident = "Sony Vaio VGN-FW21E",
 455         .matches = {
 456                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 457                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 458                 },
 459         },
 460         {
 461         .callback = init_nvs_nosave,
 462         .ident = "Sony Vaio VPCEB17FX",
 463         .matches = {
 464                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 465                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 466                 },
 467         },
 468         {
 469         .callback = init_nvs_nosave,
 470         .ident = "Sony Vaio VGN-SR11M",
 471         .matches = {
 472                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 473                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 474                 },
 475         },
 476         {
 477         .callback = init_nvs_nosave,
 478         .ident = "Everex StepNote Series",
 479         .matches = {
 480                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 481                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 482                 },
 483         },
 484         {
 485         .callback = init_nvs_nosave,
 486         .ident = "Sony Vaio VPCEB1Z1E",
 487         .matches = {
 488                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 489                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 490                 },
 491         },
 492         {
 493         .callback = init_nvs_nosave,
 494         .ident = "Sony Vaio VGN-NW130D",
 495         .matches = {
 496                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 497                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 498                 },
 499         },
 500         {
 501         .callback = init_nvs_nosave,
 502         .ident = "Sony Vaio VPCCW29FX",
 503         .matches = {
 504                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 505                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 506                 },
 507         },
 508         {
 509         .callback = init_nvs_nosave,
 510         .ident = "Averatec AV1020-ED2",
 511         .matches = {
 512                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 513                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 514                 },
 515         },
 516         {
 517         .callback = init_old_suspend_ordering,
 518         .ident = "Asus A8N-SLI DELUXE",
 519         .matches = {
 520                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 521                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 522                 },
 523         },
 524         {
 525         .callback = init_old_suspend_ordering,
 526         .ident = "Asus A8N-SLI Premium",
 527         .matches = {
 528                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 529                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 530                 },
 531         },
 532         {
 533         .callback = init_nvs_nosave,
 534         .ident = "Sony Vaio VGN-SR26GN_P",
 535         .matches = {
 536                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 537                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 538                 },
 539         },
 540         {
 541         .callback = init_nvs_nosave,
 542         .ident = "Sony Vaio VPCEB1S1E",
 543         .matches = {
 544                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 545                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
 546                 },
 547         },
 548         {
 549         .callback = init_nvs_nosave,
 550         .ident = "Sony Vaio VGN-FW520F",
 551         .matches = {
 552                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 553                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 554                 },
 555         },
 556         {
 557         .callback = init_nvs_nosave,
 558         .ident = "Asus K54C",
 559         .matches = {
 560                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 561                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 562                 },
 563         },
 564         {
 565         .callback = init_nvs_nosave,
 566         .ident = "Asus K54HR",
 567         .matches = {
 568                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 569                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 570                 },
 571         },
 572         {},
 573 };
 574 #endif /* CONFIG_SUSPEND */
 575
 576 #ifdef CONFIG_HIBERNATION
 577 static unsigned long s4_hardware_signature;
 578 static struct acpi_table_facs *facs;
 579 static bool nosigcheck;
 580
 581 void __init acpi_no_s4_hw_signature(void)
 582 {
 583         nosigcheck = true;
 584 }
 585
 586 static int acpi_hibernation_begin(void)
 587 {
 588         int error;
 589
 590         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 591         if (!error) {
 592                 acpi_target_sleep_state = ACPI_STATE_S4;
 593                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 594         }
 595
 596         return error;
 597 }
 598
 599 static int acpi_hibernation_enter(void)
 600 {
 601         acpi_status status = AE_OK;
 602
 603         ACPI_FLUSH_CPU_CACHE();
 604
 605         /* This shouldn't return.  If it returns, we have a problem */
 606         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 607         /* Reprogram control registers */
 608         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 609
 610         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 611 }
 612
 613 static void acpi_hibernation_leave(void)
 614 {
 615         /*
 616          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 617          * enable it here.
 618          */
 619         acpi_enable();
 620         /* Reprogram control registers */
 621         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 622         /* Check the hardware signature */
 623         if (facs && s4_hardware_signature != facs->hardware_signature) {
 624                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 625                         "cannot resume!\n");
 626                 panic("ACPI S4 hardware signature mismatch");
 627         }
 628         /* Restore the NVS memory area */
 629         suspend_nvs_restore();
 630         /* Allow EC transactions to happen. */
 631         acpi_ec_unblock_transactions_early();
 632 }
 633
 634 static void acpi_pm_thaw(void)
 635 {
 636         acpi_ec_unblock_transactions();
 637         acpi_enable_all_runtime_gpes();
 638 }
 639
 640 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 641         .begin = acpi_hibernation_begin,
 642         .end = acpi_pm_end,
 643         .pre_snapshot = acpi_pm_prepare,
 644         .finish = acpi_pm_finish,
 645         .prepare = acpi_pm_prepare,
 646         .enter = acpi_hibernation_enter,
 647         .leave = acpi_hibernation_leave,
 648         .pre_restore = acpi_pm_freeze,
 649         .restore_cleanup = acpi_pm_thaw,
 650 };
 651
 652 /**
 653  *      acpi_hibernation_begin_old - Set the target system sleep state to
 654  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 655  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 656  *              requested.
 657  */
 658 static int acpi_hibernation_begin_old(void)
 659 {
 660         int error;
 661         /*
 662          * The _TTS object should always be evaluated before the _PTS object.
 663          * When the old_suspended_ordering is true, the _PTS object is
 664          * evaluated in the acpi_sleep_prepare.
 665          */
 666         acpi_sleep_tts_switch(ACPI_STATE_S4);
 667
 668         error = acpi_sleep_prepare(ACPI_STATE_S4);
 669
 670         if (!error) {
 671                 if (!nvs_nosave)
 672                         error = suspend_nvs_alloc();
 673                 if (!error)
 674                         acpi_target_sleep_state = ACPI_STATE_S4;
 675         }
 676         return error;
 677 }
 678
 679 /*
 680  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 681  * been requested.
 682  */
 683 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 684         .begin = acpi_hibernation_begin_old,
 685         .end = acpi_pm_end,
 686         .pre_snapshot = acpi_pm_pre_suspend,
 687         .prepare = acpi_pm_freeze,
 688         .finish = acpi_pm_finish,
 689         .enter = acpi_hibernation_enter,
 690         .leave = acpi_hibernation_leave,
 691         .pre_restore = acpi_pm_freeze,
 692         .restore_cleanup = acpi_pm_thaw,
 693         .recover = acpi_pm_finish,
 694 };
 695 #endif /* CONFIG_HIBERNATION */
 696
 697 int acpi_suspend(u32 acpi_state)
 698 {
 699         suspend_state_t states[] = {
 700                 [1] = PM_SUSPEND_STANDBY,
 701                 [3] = PM_SUSPEND_MEM,
 702                 [5] = PM_SUSPEND_MAX
 703         };
 704
 705         if (acpi_state < 6 && states[acpi_state])
 706                 return pm_suspend(states[acpi_state]);
 707         if (acpi_state == 4)
 708                 return hibernate();
 709         return -EINVAL;
 710 }
 711
 712 static void acpi_power_off_prepare(void)
 713 {
 714         /* Prepare to power off the system */
 715         acpi_sleep_prepare(ACPI_STATE_S5);
 716         acpi_disable_all_gpes();
 717 }
 718
 719 static void acpi_power_off(void)
 720 {
 721         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 722         printk(KERN_DEBUG "%s called\n", __func__);
 723         local_irq_disable();
 724         acpi_enter_sleep_state(ACPI_STATE_S5);
 725 }
 726
 727 int __init acpi_sleep_init(void)
 728 {
 729         acpi_status status;
 730         u8 type_a, type_b;
 731 #ifdef CONFIG_SUSPEND
 732         int i = 0;
 733
 734         dmi_check_system(acpisleep_dmi_table);
 735 #endif
 736
 737         if (acpi_disabled)
 738                 return 0;
 739
 740         sleep_states[ACPI_STATE_S0] = 1;
 741         printk(KERN_INFO PREFIX "(supports S0");
 742
 743 #ifdef CONFIG_SUSPEND
 744         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 745                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 746                 if (ACPI_SUCCESS(status)) {
 747                         sleep_states[i] = 1;
 748                         printk(KERN_CONT " S%d", i);
 749                 }
 750         }
 751
 752         suspend_set_ops(old_suspend_ordering ?
 753                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 754 #endif
 755
 756 #ifdef CONFIG_HIBERNATION
 757         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 758         if (ACPI_SUCCESS(status)) {
 759                 hibernation_set_ops(old_suspend_ordering ?
 760                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 761                 sleep_states[ACPI_STATE_S4] = 1;
 762                 printk(KERN_CONT " S4");
 763                 if (!nosigcheck) {
 764                         acpi_get_table(ACPI_SIG_FACS, 1,
 765                                 (struct acpi_table_header **)&facs);
 766                         if (facs)
 767                                 s4_hardware_signature =
 768                                         facs->hardware_signature;
 769                 }
 770         }
 771 #endif
 772         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 773         if (ACPI_SUCCESS(status)) {
 774                 sleep_states[ACPI_STATE_S5] = 1;
 775                 printk(KERN_CONT " S5");
 776                 pm_power_off_prepare = acpi_power_off_prepare;
 777                 pm_power_off = acpi_power_off;
 778         }
 779         printk(KERN_CONT ")\n");
 780         /*
 781          * Register the tts_notifier to reboot notifier list so that the _TTS
 782          * object can also be evaluated when the system enters S5.
 783          */
 784         register_reboot_notifier(&tts_notifier);
 785         return 0;
 786 }