drivers/acpi/sleep.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   5  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   6  * Copyright (c) 2000-2003 Patrick Mochel
   7  * Copyright (c) 2003 Open Source Development Lab
   8  *
   9  * This file is released under the GPLv2.
  10  *
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/irq.h>
  15 #include <linux/dmi.h>
  16 #include <linux/device.h>
  17 #include <linux/suspend.h>
  18 #include <linux/reboot.h>
  19
  20 #include <asm/io.h>
  21
  22 #include <acpi/acpi_bus.h>
  23 #include <acpi/acpi_drivers.h>
  24
  25 #include "internal.h"
  26 #include "sleep.h"
  27
  28 u8 sleep_states[ACPI_S_STATE_COUNT];
  29
  30 static void acpi_sleep_tts_switch(u32 acpi_state)
  31 {
  32         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  33         struct acpi_object_list arg_list = { 1, &in_arg };
  34         acpi_status status = AE_OK;
  35
  36         in_arg.integer.value = acpi_state;
  37         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  38         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  39                 /*
  40                  * OS can't evaluate the _TTS object correctly. Some warning
  41                  * message will be printed. But it won't break anything.
  42                  */
  43                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  44         }
  45 }
  46
  47 static int tts_notify_reboot(struct notifier_block *this,
  48                         unsigned long code, void *x)
  49 {
  50         acpi_sleep_tts_switch(ACPI_STATE_S5);
  51         return NOTIFY_DONE;
  52 }
  53
  54 static struct notifier_block tts_notifier = {
  55         .notifier_call  = tts_notify_reboot,
  56         .next           = NULL,
  57         .priority       = 0,
  58 };
  59
  60 static int acpi_sleep_prepare(u32 acpi_state)
  61 {
  62 #ifdef CONFIG_ACPI_SLEEP
  63         /* do we have a wakeup address for S2 and S3? */
  64         if (acpi_state == ACPI_STATE_S3) {
  65                 if (!acpi_wakeup_address) {
  66                         return -EFAULT;
  67                 }
  68                 acpi_set_firmware_waking_vector(
  69                                 (acpi_physical_address)acpi_wakeup_address);
  70
  71         }
  72         ACPI_FLUSH_CPU_CACHE();
  73 #endif
  74         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  75                 acpi_state);
  76         acpi_enable_wakeup_device_prep(acpi_state);
  77         acpi_enable_wakeup_device(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  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
  87  * user to request that behavior by using the 'acpi_old_suspend_ordering'
  88  * kernel command line option that causes the following variable to be set.
  89  */
  90 static bool old_suspend_ordering;
  91
  92 void __init acpi_old_suspend_ordering(void)
  93 {
  94         old_suspend_ordering = true;
  95 }
  96
  97 /**
  98  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
  99  */
 100 static int acpi_pm_freeze(void)
 101 {
 102         acpi_disable_all_gpes();
 103         acpi_os_wait_events_complete(NULL);
 104         acpi_ec_block_transactions();
 105         return 0;
 106 }
 107
 108 /**
 109  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 110  *
 111  *      If necessary, set the firmware waking vector and do arch-specific
 112  *      nastiness to get the wakeup code to the waking vector.
 113  */
 114 static int __acpi_pm_prepare(void)
 115 {
 116         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 117
 118         suspend_nvs_save();
 119
 120         if (error)
 121                 acpi_target_sleep_state = ACPI_STATE_S0;
 122         return error;
 123 }
 124
 125 /**
 126  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 127  *              state and disable the GPEs.
 128  */
 129 static int acpi_pm_prepare(void)
 130 {
 131         int error = __acpi_pm_prepare();
 132
 133         if (!error)
 134                 acpi_pm_freeze();
 135
 136         return error;
 137 }
 138
 139 /**
 140  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 141  *
 142  *      This is called after we wake back up (or if entering the sleep state
 143  *      failed).
 144  */
 145 static void acpi_pm_finish(void)
 146 {
 147         u32 acpi_state = acpi_target_sleep_state;
 148
 149         acpi_ec_unblock_transactions();
 150
 151         if (acpi_state == ACPI_STATE_S0)
 152                 return;
 153
 154         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 155                 acpi_state);
 156         acpi_disable_wakeup_device(acpi_state);
 157         acpi_leave_sleep_state(acpi_state);
 158
 159         /* reset firmware waking vector */
 160         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 161
 162         acpi_target_sleep_state = ACPI_STATE_S0;
 163 }
 164
 165 /**
 166  *      acpi_pm_end - Finish up suspend sequence.
 167  */
 168 static void acpi_pm_end(void)
 169 {
 170         suspend_nvs_free();
 171         /*
 172          * This is necessary in case acpi_pm_finish() is not called during a
 173          * failing transition to a sleep state.
 174          */
 175         acpi_target_sleep_state = ACPI_STATE_S0;
 176         acpi_sleep_tts_switch(acpi_target_sleep_state);
 177 }
 178 #else /* !CONFIG_ACPI_SLEEP */
 179 #define acpi_target_sleep_state ACPI_STATE_S0
 180 #endif /* CONFIG_ACPI_SLEEP */
 181
 182 #ifdef CONFIG_SUSPEND
 183 extern void do_suspend_lowlevel(void);
 184
 185 static u32 acpi_suspend_states[] = {
 186         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 187         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 188         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 189         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 190 };
 191
 192 /**
 193  *      acpi_suspend_begin - Set the target system sleep state to the state
 194  *              associated with given @pm_state, if supported.
 195  */
 196 static int acpi_suspend_begin(suspend_state_t pm_state)
 197 {
 198         u32 acpi_state = acpi_suspend_states[pm_state];
 199         int error = 0;
 200
 201         error = suspend_nvs_alloc();
 202
 203         if (error)
 204                 return error;
 205
 206         if (sleep_states[acpi_state]) {
 207                 acpi_target_sleep_state = acpi_state;
 208                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 209         } else {
 210                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 211                         pm_state);
 212                 error = -ENOSYS;
 213         }
 214         return error;
 215 }
 216
 217 /**
 218  *      acpi_suspend_enter - Actually enter a sleep state.
 219  *      @pm_state: ignored
 220  *
 221  *      Flush caches and go to sleep. For STR we have to call arch-specific
 222  *      assembly, which in turn call acpi_enter_sleep_state().
 223  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 224  */
 225 static int acpi_suspend_enter(suspend_state_t pm_state)
 226 {
 227         acpi_status status = AE_OK;
 228         unsigned long flags = 0;
 229         u32 acpi_state = acpi_target_sleep_state;
 230
 231         ACPI_FLUSH_CPU_CACHE();
 232
 233         /* Do arch specific saving of state. */
 234         if (acpi_state == ACPI_STATE_S3) {
 235                 int error = acpi_save_state_mem();
 236
 237                 if (error)
 238                         return error;
 239         }
 240
 241         local_irq_save(flags);
 242         switch (acpi_state) {
 243         case ACPI_STATE_S1:
 244                 barrier();
 245                 status = acpi_enter_sleep_state(acpi_state);
 246                 break;
 247
 248         case ACPI_STATE_S3:
 249                 do_suspend_lowlevel();
 250                 break;
 251         }
 252
 253         /* This violates the spec but is required for bug compatibility. */
 254         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 255
 256         /* Reprogram control registers and execute _BFS */
 257         acpi_leave_sleep_state_prep(acpi_state);
 258
 259         /* ACPI 3.0 specs (P62) says that it's the responsibility
 260          * of the OSPM to clear the status bit [ implying that the
 261          * POWER_BUTTON event should not reach userspace ]
 262          */
 263         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 264                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 265
 266         /*
 267          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 268          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 269          * acpi_leave_sleep_state will reenable specific GPEs later
 270          */
 271         acpi_disable_all_gpes();
 272         /* Allow EC transactions to happen. */
 273         acpi_ec_unblock_transactions_early();
 274
 275         local_irq_restore(flags);
 276         printk(KERN_DEBUG "Back to C!\n");
 277
 278         /* restore processor state */
 279         if (acpi_state == ACPI_STATE_S3)
 280                 acpi_restore_state_mem();
 281
 282         suspend_nvs_restore();
 283
 284         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 285 }
 286
 287 static void acpi_suspend_finish(void)
 288 {
 289         acpi_pm_finish();
 290 }
 291
 292 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 293 {
 294         u32 acpi_state;
 295
 296         switch (pm_state) {
 297         case PM_SUSPEND_ON:
 298         case PM_SUSPEND_STANDBY:
 299         case PM_SUSPEND_MEM:
 300                 acpi_state = acpi_suspend_states[pm_state];
 301
 302                 return sleep_states[acpi_state];
 303         default:
 304                 return 0;
 305         }
 306 }
 307
 308 static struct platform_suspend_ops acpi_suspend_ops = {
 309         .valid = acpi_suspend_state_valid,
 310         .begin = acpi_suspend_begin,
 311         .prepare_late = acpi_pm_prepare,
 312         .enter = acpi_suspend_enter,
 313         .wake = acpi_suspend_finish,
 314         .end = acpi_pm_end,
 315 };
 316
 317 /**
 318  *      acpi_suspend_begin_old - Set the target system sleep state to the
 319  *              state associated with given @pm_state, if supported, and
 320  *              execute the _PTS control method.  This function is used if the
 321  *              pre-ACPI 2.0 suspend ordering has been requested.
 322  */
 323 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 324 {
 325         int error = acpi_suspend_begin(pm_state);
 326
 327         if (!error)
 328                 error = __acpi_pm_prepare();
 329         return error;
 330 }
 331
 332 /*
 333  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 334  * been requested.
 335  */
 336 static struct platform_suspend_ops acpi_suspend_ops_old = {
 337         .valid = acpi_suspend_state_valid,
 338         .begin = acpi_suspend_begin_old,
 339         .prepare_late = acpi_pm_freeze,
 340         .enter = acpi_suspend_enter,
 341         .wake = acpi_suspend_finish,
 342         .end = acpi_pm_end,
 343         .recover = acpi_pm_finish,
 344 };
 345
 346 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 347 {
 348         old_suspend_ordering = true;
 349         return 0;
 350 }
 351
 352 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 353         {
 354         .callback = init_old_suspend_ordering,
 355         .ident = "Abit KN9 (nForce4 variant)",
 356         .matches = {
 357                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 358                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 359                 },
 360         },
 361         {
 362         .callback = init_old_suspend_ordering,
 363         .ident = "HP xw4600 Workstation",
 364         .matches = {
 365                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 366                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 367                 },
 368         },
 369         {
 370         .callback = init_old_suspend_ordering,
 371         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 372         .matches = {
 373                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 374                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 375                 },
 376         },
 377         {
 378         .callback = init_old_suspend_ordering,
 379         .ident = "Panasonic CF51-2L",
 380         .matches = {
 381                 DMI_MATCH(DMI_BOARD_VENDOR,
 382                                 "Matsushita Electric Industrial Co.,Ltd."),
 383                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 384                 },
 385         },
 386         {},
 387 };
 388 #endif /* CONFIG_SUSPEND */
 389
 390 #ifdef CONFIG_HIBERNATION
 391 /*
 392  * The ACPI specification wants us to save NVS memory regions during hibernation
 393  * and to restore them during the subsequent resume.  However, it is not certain
 394  * if this mechanism is going to work on all machines, so we allow the user to
 395  * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
 396  * option.
 397  */
 398 static bool s4_no_nvs;
 399
 400 void __init acpi_s4_no_nvs(void)
 401 {
 402         s4_no_nvs = true;
 403 }
 404
 405 static unsigned long s4_hardware_signature;
 406 static struct acpi_table_facs *facs;
 407 static bool nosigcheck;
 408
 409 void __init acpi_no_s4_hw_signature(void)
 410 {
 411         nosigcheck = true;
 412 }
 413
 414 static int acpi_hibernation_begin(void)
 415 {
 416         int error;
 417
 418         error = s4_no_nvs ? 0 : suspend_nvs_alloc();
 419         if (!error) {
 420                 acpi_target_sleep_state = ACPI_STATE_S4;
 421                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 422         }
 423
 424         return error;
 425 }
 426
 427 static int acpi_hibernation_pre_snapshot(void)
 428 {
 429         int error = acpi_pm_prepare();
 430
 431         if (!error)
 432                 suspend_nvs_save();
 433
 434         return error;
 435 }
 436
 437 static int acpi_hibernation_enter(void)
 438 {
 439         acpi_status status = AE_OK;
 440         unsigned long flags = 0;
 441
 442         ACPI_FLUSH_CPU_CACHE();
 443
 444         local_irq_save(flags);
 445         /* This shouldn't return.  If it returns, we have a problem */
 446         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 447         /* Reprogram control registers and execute _BFS */
 448         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 449         local_irq_restore(flags);
 450
 451         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 452 }
 453
 454 static void acpi_hibernation_leave(void)
 455 {
 456         /*
 457          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 458          * enable it here.
 459          */
 460         acpi_enable();
 461         /* Reprogram control registers and execute _BFS */
 462         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 463         /* Check the hardware signature */
 464         if (facs && s4_hardware_signature != facs->hardware_signature) {
 465                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 466                         "cannot resume!\n");
 467                 panic("ACPI S4 hardware signature mismatch");
 468         }
 469         /* Restore the NVS memory area */
 470         suspend_nvs_restore();
 471         /* Allow EC transactions to happen. */
 472         acpi_ec_unblock_transactions_early();
 473 }
 474
 475 static void acpi_pm_thaw(void)
 476 {
 477         acpi_ec_unblock_transactions();
 478         acpi_enable_all_runtime_gpes();
 479 }
 480
 481 static struct platform_hibernation_ops acpi_hibernation_ops = {
 482         .begin = acpi_hibernation_begin,
 483         .end = acpi_pm_end,
 484         .pre_snapshot = acpi_hibernation_pre_snapshot,
 485         .finish = acpi_pm_finish,
 486         .prepare = acpi_pm_prepare,
 487         .enter = acpi_hibernation_enter,
 488         .leave = acpi_hibernation_leave,
 489         .pre_restore = acpi_pm_freeze,
 490         .restore_cleanup = acpi_pm_thaw,
 491 };
 492
 493 /**
 494  *      acpi_hibernation_begin_old - Set the target system sleep state to
 495  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 496  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 497  *              requested.
 498  */
 499 static int acpi_hibernation_begin_old(void)
 500 {
 501         int error;
 502         /*
 503          * The _TTS object should always be evaluated before the _PTS object.
 504          * When the old_suspended_ordering is true, the _PTS object is
 505          * evaluated in the acpi_sleep_prepare.
 506          */
 507         acpi_sleep_tts_switch(ACPI_STATE_S4);
 508
 509         error = acpi_sleep_prepare(ACPI_STATE_S4);
 510
 511         if (!error) {
 512                 if (!s4_no_nvs)
 513                         error = suspend_nvs_alloc();
 514                 if (!error)
 515                         acpi_target_sleep_state = ACPI_STATE_S4;
 516         }
 517         return error;
 518 }
 519
 520 static int acpi_hibernation_pre_snapshot_old(void)
 521 {
 522         acpi_pm_freeze();
 523         suspend_nvs_save();
 524         return 0;
 525 }
 526
 527 /*
 528  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 529  * been requested.
 530  */
 531 static struct platform_hibernation_ops acpi_hibernation_ops_old = {
 532         .begin = acpi_hibernation_begin_old,
 533         .end = acpi_pm_end,
 534         .pre_snapshot = acpi_hibernation_pre_snapshot_old,
 535         .prepare = acpi_pm_freeze,
 536         .finish = acpi_pm_finish,
 537         .enter = acpi_hibernation_enter,
 538         .leave = acpi_hibernation_leave,
 539         .pre_restore = acpi_pm_freeze,
 540         .restore_cleanup = acpi_pm_thaw,
 541         .recover = acpi_pm_finish,
 542 };
 543 #endif /* CONFIG_HIBERNATION */
 544
 545 int acpi_suspend(u32 acpi_state)
 546 {
 547         suspend_state_t states[] = {
 548                 [1] = PM_SUSPEND_STANDBY,
 549                 [3] = PM_SUSPEND_MEM,
 550                 [5] = PM_SUSPEND_MAX
 551         };
 552
 553         if (acpi_state < 6 && states[acpi_state])
 554                 return pm_suspend(states[acpi_state]);
 555         if (acpi_state == 4)
 556                 return hibernate();
 557         return -EINVAL;
 558 }
 559
 560 #ifdef CONFIG_PM_SLEEP
 561 /**
 562  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 563  *              in the system sleep state given by %acpi_target_sleep_state
 564  *      @dev: device to examine; its driver model wakeup flags control
 565  *              whether it should be able to wake up the system
 566  *      @d_min_p: used to store the upper limit of allowed states range
 567  *      Return value: preferred power state of the device on success, -ENODEV on
 568  *              failure (ie. if there's no 'struct acpi_device' for @dev)
 569  *
 570  *      Find the lowest power (highest number) ACPI device power state that
 571  *      device @dev can be in while the system is in the sleep state represented
 572  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 573  *      able to wake up the system from this sleep state.  If @d_min_p is set,
 574  *      the highest power (lowest number) device power state of @dev allowed
 575  *      in this system sleep state is stored at the location pointed to by it.
 576  *
 577  *      The caller must ensure that @dev is valid before using this function.
 578  *      The caller is also responsible for figuring out if the device is
 579  *      supposed to be able to wake up the system and passing this information
 580  *      via @wake.
 581  */
 582
 583 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
 584 {
 585         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 586         struct acpi_device *adev;
 587         char acpi_method[] = "_SxD";
 588         unsigned long long d_min, d_max;
 589
 590         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 591                 printk(KERN_DEBUG "ACPI handle has no context!\n");
 592                 return -ENODEV;
 593         }
 594
 595         acpi_method[2] = '0' + acpi_target_sleep_state;
 596         /*
 597          * If the sleep state is S0, we will return D3, but if the device has
 598          * _S0W, we will use the value from _S0W
 599          */
 600         d_min = ACPI_STATE_D0;
 601         d_max = ACPI_STATE_D3;
 602
 603         /*
 604          * If present, _SxD methods return the minimum D-state (highest power
 605          * state) we can use for the corresponding S-states.  Otherwise, the
 606          * minimum D-state is D0 (ACPI 3.x).
 607          *
 608          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 609          * provided -- that's our fault recovery, we ignore retval.
 610          */
 611         if (acpi_target_sleep_state > ACPI_STATE_S0)
 612                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 613
 614         /*
 615          * If _PRW says we can wake up the system from the target sleep state,
 616          * the D-state returned by _SxD is sufficient for that (we assume a
 617          * wakeup-aware driver if wake is set).  Still, if _SxW exists
 618          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 619          * can wake the system.  _S0W may be valid, too.
 620          */
 621         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 622             (device_may_wakeup(dev) && adev->wakeup.state.enabled &&
 623              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
 624                 acpi_status status;
 625
 626                 acpi_method[3] = 'W';
 627                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
 628                                                 &d_max);
 629                 if (ACPI_FAILURE(status)) {
 630                         d_max = d_min;
 631                 } else if (d_max < d_min) {
 632                         /* Warn the user of the broken DSDT */
 633                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
 634                                 acpi_method);
 635                         /* Sanitize it */
 636                         d_min = d_max;
 637                 }
 638         }
 639
 640         if (d_min_p)
 641                 *d_min_p = d_min;
 642         return d_max;
 643 }
 644
 645 /**
 646  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
 647  *                                  capability of given device
 648  *      @dev: device to handle
 649  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
 650  */
 651 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 652 {
 653         acpi_handle handle;
 654         struct acpi_device *adev;
 655         int error;
 656
 657         if (!device_can_wakeup(dev))
 658                 return -EINVAL;
 659
 660         handle = DEVICE_ACPI_HANDLE(dev);
 661         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 662                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
 663                 return -ENODEV;
 664         }
 665
 666         if (enable) {
 667                 error = acpi_enable_wakeup_device_power(adev,
 668                                                 acpi_target_sleep_state);
 669                 if (!error)
 670                         acpi_enable_gpe(adev->wakeup.gpe_device,
 671                                         adev->wakeup.gpe_number,
 672                                         ACPI_GPE_TYPE_WAKE);
 673         } else {
 674                 acpi_disable_gpe(adev->wakeup.gpe_device, adev->wakeup.gpe_number,
 675                                 ACPI_GPE_TYPE_WAKE);
 676                 error = acpi_disable_wakeup_device_power(adev);
 677         }
 678         if (!error)
 679                 dev_info(dev, "wake-up capability %s by ACPI\n",
 680                                 enable ? "enabled" : "disabled");
 681
 682         return error;
 683 }
 684 #endif
 685
 686 static void acpi_power_off_prepare(void)
 687 {
 688         /* Prepare to power off the system */
 689         acpi_sleep_prepare(ACPI_STATE_S5);
 690         acpi_disable_all_gpes();
 691 }
 692
 693 static void acpi_power_off(void)
 694 {
 695         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 696         printk(KERN_DEBUG "%s called\n", __func__);
 697         local_irq_disable();
 698         acpi_enter_sleep_state(ACPI_STATE_S5);
 699 }
 700
 701 /*
 702  * ACPI 2.0 created the optional _GTS and _BFS,
 703  * but industry adoption has been neither rapid nor broad.
 704  *
 705  * Linux gets into trouble when it executes poorly validated
 706  * paths through the BIOS, so disable _GTS and _BFS by default,
 707  * but do speak up and offer the option to enable them.
 708  */
 709 void __init acpi_gts_bfs_check(void)
 710 {
 711         acpi_handle dummy;
 712
 713         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
 714         {
 715                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
 716                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
 717                         "please notify linux-acpi@vger.kernel.org\n");
 718         }
 719         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
 720         {
 721                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
 722                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
 723                         "please notify linux-acpi@vger.kernel.org\n");
 724         }
 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(" 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(" 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(" S5");
 776                 pm_power_off_prepare = acpi_power_off_prepare;
 777                 pm_power_off = acpi_power_off;
 778         }
 779         printk(")\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         acpi_gts_bfs_check();
 786         return 0;
 787 }