drivers/acpi/sleep.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   5  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   6  * Copyright (c) 2000-2003 Patrick Mochel
   7  * Copyright (c) 2003 Open Source Development Lab
   8  *
   9  * This file is released under the GPLv2.
  10  *
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/irq.h>
  15 #include <linux/dmi.h>
  16 #include <linux/device.h>
  17 #include <linux/suspend.h>
  18 #include <linux/reboot.h>
  19
  20 #include <asm/io.h>
  21
  22 #include <acpi/acpi_bus.h>
  23 #include <acpi/acpi_drivers.h>
  24
  25 #include "internal.h"
  26 #include "sleep.h"
  27
  28 static u8 sleep_states[ACPI_S_STATE_COUNT];
  29
  30 static void acpi_sleep_tts_switch(u32 acpi_state)
  31 {
  32         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  33         struct acpi_object_list arg_list = { 1, &in_arg };
  34         acpi_status status = AE_OK;
  35
  36         in_arg.integer.value = acpi_state;
  37         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  38         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  39                 /*
  40                  * OS can't evaluate the _TTS object correctly. Some warning
  41                  * message will be printed. But it won't break anything.
  42                  */
  43                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  44         }
  45 }
  46
  47 static int tts_notify_reboot(struct notifier_block *this,
  48                         unsigned long code, void *x)
  49 {
  50         acpi_sleep_tts_switch(ACPI_STATE_S5);
  51         return NOTIFY_DONE;
  52 }
  53
  54 static struct notifier_block tts_notifier = {
  55         .notifier_call  = tts_notify_reboot,
  56         .next           = NULL,
  57         .priority       = 0,
  58 };
  59
  60 static int acpi_sleep_prepare(u32 acpi_state)
  61 {
  62 #ifdef CONFIG_ACPI_SLEEP
  63         /* do we have a wakeup address for S2 and S3? */
  64         if (acpi_state == ACPI_STATE_S3) {
  65                 if (!acpi_wakeup_address) {
  66                         return -EFAULT;
  67                 }
  68                 acpi_set_firmware_waking_vector(
  69                                 (acpi_physical_address)acpi_wakeup_address);
  70
  71         }
  72         ACPI_FLUSH_CPU_CACHE();
  73 #endif
  74         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  75                 acpi_state);
  76         acpi_enable_wakeup_devices(acpi_state);
  77         acpi_enter_sleep_state_prep(acpi_state);
  78         return 0;
  79 }
  80
  81 #ifdef CONFIG_ACPI_SLEEP
  82 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  83
  84 /*
  85  * The ACPI specification wants us to save NVS memory regions during hibernation
  86  * and to restore them during the subsequent resume.  Windows does that also for
  87  * suspend to RAM.  However, it is known that this mechanism does not work on
  88  * all machines, so we allow the user to disable it with the help of the
  89  * 'acpi_sleep=nonvs' kernel command line option.
  90  */
  91 static bool nvs_nosave;
  92
  93 void __init acpi_nvs_nosave(void)
  94 {
  95         nvs_nosave = true;
  96 }
  97
  98 /*
  99  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 100  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 101  * kernel command line option that causes the following variable to be set.
 102  */
 103 static bool old_suspend_ordering;
 104
 105 void __init acpi_old_suspend_ordering(void)
 106 {
 107         old_suspend_ordering = true;
 108 }
 109
 110 /**
 111  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 112  */
 113 static int acpi_pm_freeze(void)
 114 {
 115         acpi_disable_all_gpes();
 116         acpi_os_wait_events_complete(NULL);
 117         acpi_ec_block_transactions();
 118         return 0;
 119 }
 120
 121 /**
 122  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 123  */
 124 static int acpi_pm_pre_suspend(void)
 125 {
 126         acpi_pm_freeze();
 127         return suspend_nvs_save();
 128 }
 129
 130 /**
 131  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 132  *
 133  *      If necessary, set the firmware waking vector and do arch-specific
 134  *      nastiness to get the wakeup code to the waking vector.
 135  */
 136 static int __acpi_pm_prepare(void)
 137 {
 138         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 139         if (error)
 140                 acpi_target_sleep_state = ACPI_STATE_S0;
 141
 142         return error;
 143 }
 144
 145 /**
 146  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 147  *              state and disable the GPEs.
 148  */
 149 static int acpi_pm_prepare(void)
 150 {
 151         int error = __acpi_pm_prepare();
 152         if (!error)
 153                 error = acpi_pm_pre_suspend();
 154
 155         return error;
 156 }
 157
 158 /**
 159  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 160  *
 161  *      This is called after we wake back up (or if entering the sleep state
 162  *      failed).
 163  */
 164 static void acpi_pm_finish(void)
 165 {
 166         u32 acpi_state = acpi_target_sleep_state;
 167
 168         acpi_ec_unblock_transactions();
 169         suspend_nvs_free();
 170
 171         if (acpi_state == ACPI_STATE_S0)
 172                 return;
 173
 174         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 175                 acpi_state);
 176         acpi_disable_wakeup_devices(acpi_state);
 177         acpi_leave_sleep_state(acpi_state);
 178
 179         /* reset firmware waking vector */
 180         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 181
 182         acpi_target_sleep_state = ACPI_STATE_S0;
 183 }
 184
 185 /**
 186  *      acpi_pm_end - Finish up suspend sequence.
 187  */
 188 static void acpi_pm_end(void)
 189 {
 190         /*
 191          * This is necessary in case acpi_pm_finish() is not called during a
 192          * failing transition to a sleep state.
 193          */
 194         acpi_target_sleep_state = ACPI_STATE_S0;
 195         acpi_sleep_tts_switch(acpi_target_sleep_state);
 196 }
 197 #else /* !CONFIG_ACPI_SLEEP */
 198 #define acpi_target_sleep_state ACPI_STATE_S0
 199 #endif /* CONFIG_ACPI_SLEEP */
 200
 201 #ifdef CONFIG_SUSPEND
 202 static u32 acpi_suspend_states[] = {
 203         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 204         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 205         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 206         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 207 };
 208
 209 /**
 210  *      acpi_suspend_begin - Set the target system sleep state to the state
 211  *              associated with given @pm_state, if supported.
 212  */
 213 static int acpi_suspend_begin(suspend_state_t pm_state)
 214 {
 215         u32 acpi_state = acpi_suspend_states[pm_state];
 216         int error = 0;
 217
 218         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 219         if (error)
 220                 return error;
 221
 222         if (sleep_states[acpi_state]) {
 223                 acpi_target_sleep_state = acpi_state;
 224                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 225         } else {
 226                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 227                         pm_state);
 228                 error = -ENOSYS;
 229         }
 230         return error;
 231 }
 232
 233 /**
 234  *      acpi_suspend_enter - Actually enter a sleep state.
 235  *      @pm_state: ignored
 236  *
 237  *      Flush caches and go to sleep. For STR we have to call arch-specific
 238  *      assembly, which in turn call acpi_enter_sleep_state().
 239  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 240  */
 241 static int acpi_suspend_enter(suspend_state_t pm_state)
 242 {
 243         acpi_status status = AE_OK;
 244         u32 acpi_state = acpi_target_sleep_state;
 245         int error;
 246
 247         ACPI_FLUSH_CPU_CACHE();
 248
 249         switch (acpi_state) {
 250         case ACPI_STATE_S1:
 251                 barrier();
 252                 status = acpi_enter_sleep_state(acpi_state);
 253                 break;
 254
 255         case ACPI_STATE_S3:
 256                 error = acpi_suspend_lowlevel();
 257                 if (error)
 258                         return error;
 259                 pr_info(PREFIX "Low-level resume complete\n");
 260                 break;
 261         }
 262
 263         /* This violates the spec but is required for bug compatibility. */
 264         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 265
 266         /* Reprogram control registers and execute _BFS */
 267         acpi_leave_sleep_state_prep(acpi_state);
 268
 269         /* ACPI 3.0 specs (P62) says that it's the responsibility
 270          * of the OSPM to clear the status bit [ implying that the
 271          * POWER_BUTTON event should not reach userspace ]
 272          */
 273         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 274                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 275
 276         /*
 277          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 278          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 279          * acpi_leave_sleep_state will reenable specific GPEs later
 280          */
 281         acpi_disable_all_gpes();
 282         /* Allow EC transactions to happen. */
 283         acpi_ec_unblock_transactions_early();
 284
 285         suspend_nvs_restore();
 286
 287         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 288 }
 289
 290 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 291 {
 292         u32 acpi_state;
 293
 294         switch (pm_state) {
 295         case PM_SUSPEND_ON:
 296         case PM_SUSPEND_STANDBY:
 297         case PM_SUSPEND_MEM:
 298                 acpi_state = acpi_suspend_states[pm_state];
 299
 300                 return sleep_states[acpi_state];
 301         default:
 302                 return 0;
 303         }
 304 }
 305
 306 static const struct platform_suspend_ops acpi_suspend_ops = {
 307         .valid = acpi_suspend_state_valid,
 308         .begin = acpi_suspend_begin,
 309         .prepare_late = acpi_pm_prepare,
 310         .enter = acpi_suspend_enter,
 311         .wake = acpi_pm_finish,
 312         .end = acpi_pm_end,
 313 };
 314
 315 /**
 316  *      acpi_suspend_begin_old - Set the target system sleep state to the
 317  *              state associated with given @pm_state, if supported, and
 318  *              execute the _PTS control method.  This function is used if the
 319  *              pre-ACPI 2.0 suspend ordering has been requested.
 320  */
 321 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 322 {
 323         int error = acpi_suspend_begin(pm_state);
 324         if (!error)
 325                 error = __acpi_pm_prepare();
 326
 327         return error;
 328 }
 329
 330 /*
 331  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 332  * been requested.
 333  */
 334 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 335         .valid = acpi_suspend_state_valid,
 336         .begin = acpi_suspend_begin_old,
 337         .prepare_late = acpi_pm_pre_suspend,
 338         .enter = acpi_suspend_enter,
 339         .wake = acpi_pm_finish,
 340         .end = acpi_pm_end,
 341         .recover = acpi_pm_finish,
 342 };
 343
 344 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 345 {
 346         old_suspend_ordering = true;
 347         return 0;
 348 }
 349
 350 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 351 {
 352         acpi_nvs_nosave();
 353         return 0;
 354 }
 355
 356 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 357         {
 358         .callback = init_old_suspend_ordering,
 359         .ident = "Abit KN9 (nForce4 variant)",
 360         .matches = {
 361                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 362                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 363                 },
 364         },
 365         {
 366         .callback = init_old_suspend_ordering,
 367         .ident = "HP xw4600 Workstation",
 368         .matches = {
 369                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 370                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 371                 },
 372         },
 373         {
 374         .callback = init_old_suspend_ordering,
 375         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 376         .matches = {
 377                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 378                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 379                 },
 380         },
 381         {
 382         .callback = init_old_suspend_ordering,
 383         .ident = "Panasonic CF51-2L",
 384         .matches = {
 385                 DMI_MATCH(DMI_BOARD_VENDOR,
 386                                 "Matsushita Electric Industrial Co.,Ltd."),
 387                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 388                 },
 389         },
 390         {
 391         .callback = init_nvs_nosave,
 392         .ident = "Sony Vaio VGN-SR11M",
 393         .matches = {
 394                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 395                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 396                 },
 397         },
 398         {
 399         .callback = init_nvs_nosave,
 400         .ident = "Everex StepNote Series",
 401         .matches = {
 402                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 403                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 404                 },
 405         },
 406         {
 407         .callback = init_nvs_nosave,
 408         .ident = "Sony Vaio VPCEB1Z1E",
 409         .matches = {
 410                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 411                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 412                 },
 413         },
 414         {
 415         .callback = init_nvs_nosave,
 416         .ident = "Sony Vaio VGN-NW130D",
 417         .matches = {
 418                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 419                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 420                 },
 421         },
 422         {
 423         .callback = init_nvs_nosave,
 424         .ident = "Averatec AV1020-ED2",
 425         .matches = {
 426                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 427                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 428                 },
 429         },
 430         {},
 431 };
 432 #endif /* CONFIG_SUSPEND */
 433
 434 #ifdef CONFIG_HIBERNATION
 435 static unsigned long s4_hardware_signature;
 436 static struct acpi_table_facs *facs;
 437 static bool nosigcheck;
 438
 439 void __init acpi_no_s4_hw_signature(void)
 440 {
 441         nosigcheck = true;
 442 }
 443
 444 static int acpi_hibernation_begin(void)
 445 {
 446         int error;
 447
 448         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 449         if (!error) {
 450                 acpi_target_sleep_state = ACPI_STATE_S4;
 451                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 452         }
 453
 454         return error;
 455 }
 456
 457 static int acpi_hibernation_enter(void)
 458 {
 459         acpi_status status = AE_OK;
 460
 461         ACPI_FLUSH_CPU_CACHE();
 462
 463         /* This shouldn't return.  If it returns, we have a problem */
 464         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 465         /* Reprogram control registers and execute _BFS */
 466         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 467
 468         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 469 }
 470
 471 static void acpi_hibernation_leave(void)
 472 {
 473         /*
 474          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 475          * enable it here.
 476          */
 477         acpi_enable();
 478         /* Reprogram control registers and execute _BFS */
 479         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 480         /* Check the hardware signature */
 481         if (facs && s4_hardware_signature != facs->hardware_signature) {
 482                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 483                         "cannot resume!\n");
 484                 panic("ACPI S4 hardware signature mismatch");
 485         }
 486         /* Restore the NVS memory area */
 487         suspend_nvs_restore();
 488         /* Allow EC transactions to happen. */
 489         acpi_ec_unblock_transactions_early();
 490 }
 491
 492 static void acpi_pm_thaw(void)
 493 {
 494         acpi_ec_unblock_transactions();
 495         acpi_enable_all_runtime_gpes();
 496 }
 497
 498 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 499         .begin = acpi_hibernation_begin,
 500         .end = acpi_pm_end,
 501         .pre_snapshot = acpi_pm_prepare,
 502         .finish = acpi_pm_finish,
 503         .prepare = acpi_pm_prepare,
 504         .enter = acpi_hibernation_enter,
 505         .leave = acpi_hibernation_leave,
 506         .pre_restore = acpi_pm_freeze,
 507         .restore_cleanup = acpi_pm_thaw,
 508 };
 509
 510 /**
 511  *      acpi_hibernation_begin_old - Set the target system sleep state to
 512  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 513  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 514  *              requested.
 515  */
 516 static int acpi_hibernation_begin_old(void)
 517 {
 518         int error;
 519         /*
 520          * The _TTS object should always be evaluated before the _PTS object.
 521          * When the old_suspended_ordering is true, the _PTS object is
 522          * evaluated in the acpi_sleep_prepare.
 523          */
 524         acpi_sleep_tts_switch(ACPI_STATE_S4);
 525
 526         error = acpi_sleep_prepare(ACPI_STATE_S4);
 527
 528         if (!error) {
 529                 if (!nvs_nosave)
 530                         error = suspend_nvs_alloc();
 531                 if (!error)
 532                         acpi_target_sleep_state = ACPI_STATE_S4;
 533         }
 534         return error;
 535 }
 536
 537 /*
 538  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 539  * been requested.
 540  */
 541 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 542         .begin = acpi_hibernation_begin_old,
 543         .end = acpi_pm_end,
 544         .pre_snapshot = acpi_pm_pre_suspend,
 545         .prepare = acpi_pm_freeze,
 546         .finish = acpi_pm_finish,
 547         .enter = acpi_hibernation_enter,
 548         .leave = acpi_hibernation_leave,
 549         .pre_restore = acpi_pm_freeze,
 550         .restore_cleanup = acpi_pm_thaw,
 551         .recover = acpi_pm_finish,
 552 };
 553 #endif /* CONFIG_HIBERNATION */
 554
 555 int acpi_suspend(u32 acpi_state)
 556 {
 557         suspend_state_t states[] = {
 558                 [1] = PM_SUSPEND_STANDBY,
 559                 [3] = PM_SUSPEND_MEM,
 560                 [5] = PM_SUSPEND_MAX
 561         };
 562
 563         if (acpi_state < 6 && states[acpi_state])
 564                 return pm_suspend(states[acpi_state]);
 565         if (acpi_state == 4)
 566                 return hibernate();
 567         return -EINVAL;
 568 }
 569
 570 #ifdef CONFIG_PM_OPS
 571 /**
 572  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 573  *              in the system sleep state given by %acpi_target_sleep_state
 574  *      @dev: device to examine; its driver model wakeup flags control
 575  *              whether it should be able to wake up the system
 576  *      @d_min_p: used to store the upper limit of allowed states range
 577  *      Return value: preferred power state of the device on success, -ENODEV on
 578  *              failure (ie. if there's no 'struct acpi_device' for @dev)
 579  *
 580  *      Find the lowest power (highest number) ACPI device power state that
 581  *      device @dev can be in while the system is in the sleep state represented
 582  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 583  *      able to wake up the system from this sleep state.  If @d_min_p is set,
 584  *      the highest power (lowest number) device power state of @dev allowed
 585  *      in this system sleep state is stored at the location pointed to by it.
 586  *
 587  *      The caller must ensure that @dev is valid before using this function.
 588  *      The caller is also responsible for figuring out if the device is
 589  *      supposed to be able to wake up the system and passing this information
 590  *      via @wake.
 591  */
 592
 593 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
 594 {
 595         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 596         struct acpi_device *adev;
 597         char acpi_method[] = "_SxD";
 598         unsigned long long d_min, d_max;
 599
 600         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 601                 printk(KERN_DEBUG "ACPI handle has no context!\n");
 602                 return -ENODEV;
 603         }
 604
 605         acpi_method[2] = '0' + acpi_target_sleep_state;
 606         /*
 607          * If the sleep state is S0, we will return D3, but if the device has
 608          * _S0W, we will use the value from _S0W
 609          */
 610         d_min = ACPI_STATE_D0;
 611         d_max = ACPI_STATE_D3;
 612
 613         /*
 614          * If present, _SxD methods return the minimum D-state (highest power
 615          * state) we can use for the corresponding S-states.  Otherwise, the
 616          * minimum D-state is D0 (ACPI 3.x).
 617          *
 618          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 619          * provided -- that's our fault recovery, we ignore retval.
 620          */
 621         if (acpi_target_sleep_state > ACPI_STATE_S0)
 622                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 623
 624         /*
 625          * If _PRW says we can wake up the system from the target sleep state,
 626          * the D-state returned by _SxD is sufficient for that (we assume a
 627          * wakeup-aware driver if wake is set).  Still, if _SxW exists
 628          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 629          * can wake the system.  _S0W may be valid, too.
 630          */
 631         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 632             (device_may_wakeup(dev) &&
 633              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
 634                 acpi_status status;
 635
 636                 acpi_method[3] = 'W';
 637                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
 638                                                 &d_max);
 639                 if (ACPI_FAILURE(status)) {
 640                         if (acpi_target_sleep_state != ACPI_STATE_S0 ||
 641                             status != AE_NOT_FOUND)
 642                                 d_max = d_min;
 643                 } else if (d_max < d_min) {
 644                         /* Warn the user of the broken DSDT */
 645                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
 646                                 acpi_method);
 647                         /* Sanitize it */
 648                         d_min = d_max;
 649                 }
 650         }
 651
 652         if (d_min_p)
 653                 *d_min_p = d_min;
 654         return d_max;
 655 }
 656 #endif /* CONFIG_PM_OPS */
 657
 658 #ifdef CONFIG_PM_SLEEP
 659 /**
 660  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
 661  *                                  capability of given device
 662  *      @dev: device to handle
 663  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
 664  */
 665 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 666 {
 667         acpi_handle handle;
 668         struct acpi_device *adev;
 669         int error;
 670
 671         if (!device_can_wakeup(dev))
 672                 return -EINVAL;
 673
 674         handle = DEVICE_ACPI_HANDLE(dev);
 675         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 676                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
 677                 return -ENODEV;
 678         }
 679
 680         error = enable ?
 681                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
 682                 acpi_disable_wakeup_device_power(adev);
 683         if (!error)
 684                 dev_info(dev, "wake-up capability %s by ACPI\n",
 685                                 enable ? "enabled" : "disabled");
 686
 687         return error;
 688 }
 689 #endif  /* CONFIG_PM_SLEEP */
 690
 691 static void acpi_power_off_prepare(void)
 692 {
 693         /* Prepare to power off the system */
 694         acpi_sleep_prepare(ACPI_STATE_S5);
 695         acpi_disable_all_gpes();
 696 }
 697
 698 static void acpi_power_off(void)
 699 {
 700         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 701         printk(KERN_DEBUG "%s called\n", __func__);
 702         local_irq_disable();
 703         acpi_enter_sleep_state(ACPI_STATE_S5);
 704 }
 705
 706 /*
 707  * ACPI 2.0 created the optional _GTS and _BFS,
 708  * but industry adoption has been neither rapid nor broad.
 709  *
 710  * Linux gets into trouble when it executes poorly validated
 711  * paths through the BIOS, so disable _GTS and _BFS by default,
 712  * but do speak up and offer the option to enable them.
 713  */
 714 static void __init acpi_gts_bfs_check(void)
 715 {
 716         acpi_handle dummy;
 717
 718         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
 719         {
 720                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
 721                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
 722                         "please notify linux-acpi@vger.kernel.org\n");
 723         }
 724         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
 725         {
 726                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
 727                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
 728                         "please notify linux-acpi@vger.kernel.org\n");
 729         }
 730 }
 731
 732 int __init acpi_sleep_init(void)
 733 {
 734         acpi_status status;
 735         u8 type_a, type_b;
 736 #ifdef CONFIG_SUSPEND
 737         int i = 0;
 738
 739         dmi_check_system(acpisleep_dmi_table);
 740 #endif
 741
 742         if (acpi_disabled)
 743                 return 0;
 744
 745         sleep_states[ACPI_STATE_S0] = 1;
 746         printk(KERN_INFO PREFIX "(supports S0");
 747
 748 #ifdef CONFIG_SUSPEND
 749         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 750                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 751                 if (ACPI_SUCCESS(status)) {
 752                         sleep_states[i] = 1;
 753                         printk(" S%d", i);
 754                 }
 755         }
 756
 757         suspend_set_ops(old_suspend_ordering ?
 758                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 759 #endif
 760
 761 #ifdef CONFIG_HIBERNATION
 762         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 763         if (ACPI_SUCCESS(status)) {
 764                 hibernation_set_ops(old_suspend_ordering ?
 765                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 766                 sleep_states[ACPI_STATE_S4] = 1;
 767                 printk(" S4");
 768                 if (!nosigcheck) {
 769                         acpi_get_table(ACPI_SIG_FACS, 1,
 770                                 (struct acpi_table_header **)&facs);
 771                         if (facs)
 772                                 s4_hardware_signature =
 773                                         facs->hardware_signature;
 774                 }
 775         }
 776 #endif
 777         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 778         if (ACPI_SUCCESS(status)) {
 779                 sleep_states[ACPI_STATE_S5] = 1;
 780                 printk(" S5");
 781                 pm_power_off_prepare = acpi_power_off_prepare;
 782                 pm_power_off = acpi_power_off;
 783         }
 784         printk(")\n");
 785         /*
 786          * Register the tts_notifier to reboot notifier list so that the _TTS
 787          * object can also be evaluated when the system enters S5.
 788          */
 789         register_reboot_notifier(&tts_notifier);
 790         acpi_gts_bfs_check();
 791         return 0;
 792 }