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         acpi_enable_wakeup_device_prep(acpi_state);
  74 #endif
  75         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  76                 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  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
  86  * user to request that behavior by using the 'acpi_old_suspend_ordering'
  87  * kernel command line option that causes the following variable to be set.
  88  */
  89 static bool old_suspend_ordering;
  90
  91 void __init acpi_old_suspend_ordering(void)
  92 {
  93         old_suspend_ordering = true;
  94 }
  95
  96 /**
  97  *      acpi_pm_disable_gpes - Disable the GPEs.
  98  */
  99 static int acpi_pm_disable_gpes(void)
 100 {
 101         acpi_disable_all_gpes();
 102         return 0;
 103 }
 104
 105 /**
 106  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 107  *
 108  *      If necessary, set the firmware waking vector and do arch-specific
 109  *      nastiness to get the wakeup code to the waking vector.
 110  */
 111 static int __acpi_pm_prepare(void)
 112 {
 113         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 114
 115         if (error)
 116                 acpi_target_sleep_state = ACPI_STATE_S0;
 117         return error;
 118 }
 119
 120 /**
 121  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 122  *              state and disable the GPEs.
 123  */
 124 static int acpi_pm_prepare(void)
 125 {
 126         int error = __acpi_pm_prepare();
 127
 128         if (!error)
 129                 acpi_disable_all_gpes();
 130         return error;
 131 }
 132
 133 /**
 134  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 135  *
 136  *      This is called after we wake back up (or if entering the sleep state
 137  *      failed).
 138  */
 139 static void acpi_pm_finish(void)
 140 {
 141         u32 acpi_state = acpi_target_sleep_state;
 142
 143         if (acpi_state == ACPI_STATE_S0)
 144                 return;
 145
 146         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 147                 acpi_state);
 148         acpi_disable_wakeup_device(acpi_state);
 149         acpi_leave_sleep_state(acpi_state);
 150
 151         /* reset firmware waking vector */
 152         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 153
 154         acpi_target_sleep_state = ACPI_STATE_S0;
 155 }
 156
 157 /**
 158  *      acpi_pm_end - Finish up suspend sequence.
 159  */
 160 static void acpi_pm_end(void)
 161 {
 162         /*
 163          * This is necessary in case acpi_pm_finish() is not called during a
 164          * failing transition to a sleep state.
 165          */
 166         acpi_target_sleep_state = ACPI_STATE_S0;
 167         acpi_sleep_tts_switch(acpi_target_sleep_state);
 168 }
 169 #else /* !CONFIG_ACPI_SLEEP */
 170 #define acpi_target_sleep_state ACPI_STATE_S0
 171 #endif /* CONFIG_ACPI_SLEEP */
 172
 173 #ifdef CONFIG_SUSPEND
 174 extern void do_suspend_lowlevel(void);
 175
 176 static u32 acpi_suspend_states[] = {
 177         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 178         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 179         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 180         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 181 };
 182
 183 /**
 184  *      acpi_suspend_begin - Set the target system sleep state to the state
 185  *              associated with given @pm_state, if supported.
 186  */
 187 static int acpi_suspend_begin(suspend_state_t pm_state)
 188 {
 189         u32 acpi_state = acpi_suspend_states[pm_state];
 190         int error = 0;
 191
 192         if (sleep_states[acpi_state]) {
 193                 acpi_target_sleep_state = acpi_state;
 194                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 195         } else {
 196                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 197                         pm_state);
 198                 error = -ENOSYS;
 199         }
 200         return error;
 201 }
 202
 203 /**
 204  *      acpi_suspend_enter - Actually enter a sleep state.
 205  *      @pm_state: ignored
 206  *
 207  *      Flush caches and go to sleep. For STR we have to call arch-specific
 208  *      assembly, which in turn call acpi_enter_sleep_state().
 209  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 210  */
 211 static int acpi_suspend_enter(suspend_state_t pm_state)
 212 {
 213         acpi_status status = AE_OK;
 214         unsigned long flags = 0;
 215         u32 acpi_state = acpi_target_sleep_state;
 216
 217         ACPI_FLUSH_CPU_CACHE();
 218
 219         /* Do arch specific saving of state. */
 220         if (acpi_state == ACPI_STATE_S3) {
 221                 int error = acpi_save_state_mem();
 222
 223                 if (error)
 224                         return error;
 225         }
 226
 227         local_irq_save(flags);
 228         acpi_enable_wakeup_device(acpi_state);
 229         switch (acpi_state) {
 230         case ACPI_STATE_S1:
 231                 barrier();
 232                 status = acpi_enter_sleep_state(acpi_state);
 233                 break;
 234
 235         case ACPI_STATE_S3:
 236                 do_suspend_lowlevel();
 237                 break;
 238         }
 239
 240         /* This violates the spec but is required for bug compatibility. */
 241         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 242
 243         /* Reprogram control registers and execute _BFS */
 244         acpi_leave_sleep_state_prep(acpi_state);
 245
 246         /* ACPI 3.0 specs (P62) says that it's the responsibility
 247          * of the OSPM to clear the status bit [ implying that the
 248          * POWER_BUTTON event should not reach userspace ]
 249          */
 250         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 251                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 252
 253         /*
 254          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 255          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 256          * acpi_leave_sleep_state will reenable specific GPEs later
 257          */
 258         acpi_disable_all_gpes();
 259
 260         local_irq_restore(flags);
 261         printk(KERN_DEBUG "Back to C!\n");
 262
 263         /* restore processor state */
 264         if (acpi_state == ACPI_STATE_S3)
 265                 acpi_restore_state_mem();
 266
 267         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 268 }
 269
 270 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 271 {
 272         u32 acpi_state;
 273
 274         switch (pm_state) {
 275         case PM_SUSPEND_ON:
 276         case PM_SUSPEND_STANDBY:
 277         case PM_SUSPEND_MEM:
 278                 acpi_state = acpi_suspend_states[pm_state];
 279
 280                 return sleep_states[acpi_state];
 281         default:
 282                 return 0;
 283         }
 284 }
 285
 286 static struct platform_suspend_ops acpi_suspend_ops = {
 287         .valid = acpi_suspend_state_valid,
 288         .begin = acpi_suspend_begin,
 289         .prepare_late = acpi_pm_prepare,
 290         .enter = acpi_suspend_enter,
 291         .wake = acpi_pm_finish,
 292         .end = acpi_pm_end,
 293 };
 294
 295 /**
 296  *      acpi_suspend_begin_old - Set the target system sleep state to the
 297  *              state associated with given @pm_state, if supported, and
 298  *              execute the _PTS control method.  This function is used if the
 299  *              pre-ACPI 2.0 suspend ordering has been requested.
 300  */
 301 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 302 {
 303         int error = acpi_suspend_begin(pm_state);
 304
 305         if (!error)
 306                 error = __acpi_pm_prepare();
 307         return error;
 308 }
 309
 310 /*
 311  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 312  * been requested.
 313  */
 314 static struct platform_suspend_ops acpi_suspend_ops_old = {
 315         .valid = acpi_suspend_state_valid,
 316         .begin = acpi_suspend_begin_old,
 317         .prepare_late = acpi_pm_disable_gpes,
 318         .enter = acpi_suspend_enter,
 319         .wake = acpi_pm_finish,
 320         .end = acpi_pm_end,
 321         .recover = acpi_pm_finish,
 322 };
 323
 324 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 325 {
 326         old_suspend_ordering = true;
 327         return 0;
 328 }
 329
 330 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 331         {
 332         .callback = init_old_suspend_ordering,
 333         .ident = "Abit KN9 (nForce4 variant)",
 334         .matches = {
 335                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 336                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 337                 },
 338         },
 339         {
 340         .callback = init_old_suspend_ordering,
 341         .ident = "HP xw4600 Workstation",
 342         .matches = {
 343                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 344                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 345                 },
 346         },
 347         {
 348         .callback = init_old_suspend_ordering,
 349         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 350         .matches = {
 351                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 352                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 353                 },
 354         },
 355         {
 356         .callback = init_old_suspend_ordering,
 357         .ident = "Panasonic CF51-2L",
 358         .matches = {
 359                 DMI_MATCH(DMI_BOARD_VENDOR,
 360                                 "Matsushita Electric Industrial Co.,Ltd."),
 361                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 362                 },
 363         },
 364         {},
 365 };
 366 #endif /* CONFIG_SUSPEND */
 367
 368 #ifdef CONFIG_HIBERNATION
 369 /*
 370  * The ACPI specification wants us to save NVS memory regions during hibernation
 371  * and to restore them during the subsequent resume.  However, it is not certain
 372  * if this mechanism is going to work on all machines, so we allow the user to
 373  * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
 374  * option.
 375  */
 376 static bool s4_no_nvs;
 377
 378 void __init acpi_s4_no_nvs(void)
 379 {
 380         s4_no_nvs = true;
 381 }
 382
 383 static unsigned long s4_hardware_signature;
 384 static struct acpi_table_facs *facs;
 385 static bool nosigcheck;
 386
 387 void __init acpi_no_s4_hw_signature(void)
 388 {
 389         nosigcheck = true;
 390 }
 391
 392 static int acpi_hibernation_begin(void)
 393 {
 394         int error;
 395
 396         error = s4_no_nvs ? 0 : hibernate_nvs_alloc();
 397         if (!error) {
 398                 acpi_target_sleep_state = ACPI_STATE_S4;
 399                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 400         }
 401
 402         return error;
 403 }
 404
 405 static int acpi_hibernation_pre_snapshot(void)
 406 {
 407         int error = acpi_pm_prepare();
 408
 409         if (!error)
 410                 hibernate_nvs_save();
 411
 412         return error;
 413 }
 414
 415 static int acpi_hibernation_enter(void)
 416 {
 417         acpi_status status = AE_OK;
 418         unsigned long flags = 0;
 419
 420         ACPI_FLUSH_CPU_CACHE();
 421
 422         local_irq_save(flags);
 423         acpi_enable_wakeup_device(ACPI_STATE_S4);
 424         /* This shouldn't return.  If it returns, we have a problem */
 425         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 426         /* Reprogram control registers and execute _BFS */
 427         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 428         local_irq_restore(flags);
 429
 430         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 431 }
 432
 433 static void acpi_hibernation_finish(void)
 434 {
 435         hibernate_nvs_free();
 436         acpi_pm_finish();
 437 }
 438
 439 static void acpi_hibernation_leave(void)
 440 {
 441         /*
 442          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 443          * enable it here.
 444          */
 445         acpi_enable();
 446         /* Reprogram control registers and execute _BFS */
 447         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 448         /* Check the hardware signature */
 449         if (facs && s4_hardware_signature != facs->hardware_signature) {
 450                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 451                         "cannot resume!\n");
 452                 panic("ACPI S4 hardware signature mismatch");
 453         }
 454         /* Restore the NVS memory area */
 455         hibernate_nvs_restore();
 456 }
 457
 458 static void acpi_pm_enable_gpes(void)
 459 {
 460         acpi_enable_all_runtime_gpes();
 461 }
 462
 463 static struct platform_hibernation_ops acpi_hibernation_ops = {
 464         .begin = acpi_hibernation_begin,
 465         .end = acpi_pm_end,
 466         .pre_snapshot = acpi_hibernation_pre_snapshot,
 467         .finish = acpi_hibernation_finish,
 468         .prepare = acpi_pm_prepare,
 469         .enter = acpi_hibernation_enter,
 470         .leave = acpi_hibernation_leave,
 471         .pre_restore = acpi_pm_disable_gpes,
 472         .restore_cleanup = acpi_pm_enable_gpes,
 473 };
 474
 475 /**
 476  *      acpi_hibernation_begin_old - Set the target system sleep state to
 477  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 478  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 479  *              requested.
 480  */
 481 static int acpi_hibernation_begin_old(void)
 482 {
 483         int error;
 484         /*
 485          * The _TTS object should always be evaluated before the _PTS object.
 486          * When the old_suspended_ordering is true, the _PTS object is
 487          * evaluated in the acpi_sleep_prepare.
 488          */
 489         acpi_sleep_tts_switch(ACPI_STATE_S4);
 490
 491         error = acpi_sleep_prepare(ACPI_STATE_S4);
 492
 493         if (!error) {
 494                 if (!s4_no_nvs)
 495                         error = hibernate_nvs_alloc();
 496                 if (!error)
 497                         acpi_target_sleep_state = ACPI_STATE_S4;
 498         }
 499         return error;
 500 }
 501
 502 static int acpi_hibernation_pre_snapshot_old(void)
 503 {
 504         int error = acpi_pm_disable_gpes();
 505
 506         if (!error)
 507                 hibernate_nvs_save();
 508
 509         return error;
 510 }
 511
 512 /*
 513  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 514  * been requested.
 515  */
 516 static struct platform_hibernation_ops acpi_hibernation_ops_old = {
 517         .begin = acpi_hibernation_begin_old,
 518         .end = acpi_pm_end,
 519         .pre_snapshot = acpi_hibernation_pre_snapshot_old,
 520         .finish = acpi_hibernation_finish,
 521         .prepare = acpi_pm_disable_gpes,
 522         .enter = acpi_hibernation_enter,
 523         .leave = acpi_hibernation_leave,
 524         .pre_restore = acpi_pm_disable_gpes,
 525         .restore_cleanup = acpi_pm_enable_gpes,
 526         .recover = acpi_pm_finish,
 527 };
 528 #endif /* CONFIG_HIBERNATION */
 529
 530 int acpi_suspend(u32 acpi_state)
 531 {
 532         suspend_state_t states[] = {
 533                 [1] = PM_SUSPEND_STANDBY,
 534                 [3] = PM_SUSPEND_MEM,
 535                 [5] = PM_SUSPEND_MAX
 536         };
 537
 538         if (acpi_state < 6 && states[acpi_state])
 539                 return pm_suspend(states[acpi_state]);
 540         if (acpi_state == 4)
 541                 return hibernate();
 542         return -EINVAL;
 543 }
 544
 545 #ifdef CONFIG_PM_SLEEP
 546 /**
 547  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 548  *              in the system sleep state given by %acpi_target_sleep_state
 549  *      @dev: device to examine; its driver model wakeup flags control
 550  *              whether it should be able to wake up the system
 551  *      @d_min_p: used to store the upper limit of allowed states range
 552  *      Return value: preferred power state of the device on success, -ENODEV on
 553  *              failure (ie. if there's no 'struct acpi_device' for @dev)
 554  *
 555  *      Find the lowest power (highest number) ACPI device power state that
 556  *      device @dev can be in while the system is in the sleep state represented
 557  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 558  *      able to wake up the system from this sleep state.  If @d_min_p is set,
 559  *      the highest power (lowest number) device power state of @dev allowed
 560  *      in this system sleep state is stored at the location pointed to by it.
 561  *
 562  *      The caller must ensure that @dev is valid before using this function.
 563  *      The caller is also responsible for figuring out if the device is
 564  *      supposed to be able to wake up the system and passing this information
 565  *      via @wake.
 566  */
 567
 568 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
 569 {
 570         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 571         struct acpi_device *adev;
 572         char acpi_method[] = "_SxD";
 573         unsigned long long d_min, d_max;
 574
 575         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 576                 printk(KERN_DEBUG "ACPI handle has no context!\n");
 577                 return -ENODEV;
 578         }
 579
 580         acpi_method[2] = '0' + acpi_target_sleep_state;
 581         /*
 582          * If the sleep state is S0, we will return D3, but if the device has
 583          * _S0W, we will use the value from _S0W
 584          */
 585         d_min = ACPI_STATE_D0;
 586         d_max = ACPI_STATE_D3;
 587
 588         /*
 589          * If present, _SxD methods return the minimum D-state (highest power
 590          * state) we can use for the corresponding S-states.  Otherwise, the
 591          * minimum D-state is D0 (ACPI 3.x).
 592          *
 593          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 594          * provided -- that's our fault recovery, we ignore retval.
 595          */
 596         if (acpi_target_sleep_state > ACPI_STATE_S0)
 597                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 598
 599         /*
 600          * If _PRW says we can wake up the system from the target sleep state,
 601          * the D-state returned by _SxD is sufficient for that (we assume a
 602          * wakeup-aware driver if wake is set).  Still, if _SxW exists
 603          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 604          * can wake the system.  _S0W may be valid, too.
 605          */
 606         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 607             (device_may_wakeup(dev) && adev->wakeup.state.enabled &&
 608              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
 609                 acpi_status status;
 610
 611                 acpi_method[3] = 'W';
 612                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
 613                                                 &d_max);
 614                 if (ACPI_FAILURE(status)) {
 615                         d_max = d_min;
 616                 } else if (d_max < d_min) {
 617                         /* Warn the user of the broken DSDT */
 618                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
 619                                 acpi_method);
 620                         /* Sanitize it */
 621                         d_min = d_max;
 622                 }
 623         }
 624
 625         if (d_min_p)
 626                 *d_min_p = d_min;
 627         return d_max;
 628 }
 629
 630 /**
 631  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
 632  *                                  capability of given device
 633  *      @dev: device to handle
 634  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
 635  */
 636 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 637 {
 638         acpi_handle handle;
 639         struct acpi_device *adev;
 640         int error;
 641
 642         if (!device_can_wakeup(dev))
 643                 return -EINVAL;
 644
 645         handle = DEVICE_ACPI_HANDLE(dev);
 646         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 647                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
 648                 return -ENODEV;
 649         }
 650
 651         error = enable ?
 652                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
 653                 acpi_disable_wakeup_device_power(adev);
 654         if (!error)
 655                 dev_info(dev, "wake-up capability %s by ACPI\n",
 656                                 enable ? "enabled" : "disabled");
 657
 658         return error;
 659 }
 660 #endif
 661
 662 static void acpi_power_off_prepare(void)
 663 {
 664         /* Prepare to power off the system */
 665         acpi_sleep_prepare(ACPI_STATE_S5);
 666         acpi_disable_all_gpes();
 667 }
 668
 669 static void acpi_power_off(void)
 670 {
 671         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 672         printk(KERN_DEBUG "%s called\n", __func__);
 673         local_irq_disable();
 674         acpi_enable_wakeup_device(ACPI_STATE_S5);
 675         acpi_enter_sleep_state(ACPI_STATE_S5);
 676 }
 677
 678 /*
 679  * ACPI 2.0 created the optional _GTS and _BFS,
 680  * but industry adoption has been neither rapid nor broad.
 681  *
 682  * Linux gets into trouble when it executes poorly validated
 683  * paths through the BIOS, so disable _GTS and _BFS by default,
 684  * but do speak up and offer the option to enable them.
 685  */
 686 void __init acpi_gts_bfs_check(void)
 687 {
 688         acpi_handle dummy;
 689
 690         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
 691         {
 692                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
 693                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
 694                         "please notify linux-acpi@vger.kernel.org\n");
 695         }
 696         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
 697         {
 698                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
 699                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
 700                         "please notify linux-acpi@vger.kernel.org\n");
 701         }
 702 }
 703
 704 int __init acpi_sleep_init(void)
 705 {
 706         acpi_status status;
 707         u8 type_a, type_b;
 708 #ifdef CONFIG_SUSPEND
 709         int i = 0;
 710
 711         dmi_check_system(acpisleep_dmi_table);
 712 #endif
 713
 714         if (acpi_disabled)
 715                 return 0;
 716
 717         sleep_states[ACPI_STATE_S0] = 1;
 718         printk(KERN_INFO PREFIX "(supports S0");
 719
 720 #ifdef CONFIG_SUSPEND
 721         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 722                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 723                 if (ACPI_SUCCESS(status)) {
 724                         sleep_states[i] = 1;
 725                         printk(" S%d", i);
 726                 }
 727         }
 728
 729         suspend_set_ops(old_suspend_ordering ?
 730                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 731 #endif
 732
 733 #ifdef CONFIG_HIBERNATION
 734         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 735         if (ACPI_SUCCESS(status)) {
 736                 hibernation_set_ops(old_suspend_ordering ?
 737                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 738                 sleep_states[ACPI_STATE_S4] = 1;
 739                 printk(" S4");
 740                 if (!nosigcheck) {
 741                         acpi_get_table(ACPI_SIG_FACS, 1,
 742                                 (struct acpi_table_header **)&facs);
 743                         if (facs)
 744                                 s4_hardware_signature =
 745                                         facs->hardware_signature;
 746                 }
 747         }
 748 #endif
 749         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 750         if (ACPI_SUCCESS(status)) {
 751                 sleep_states[ACPI_STATE_S5] = 1;
 752                 printk(" S5");
 753                 pm_power_off_prepare = acpi_power_off_prepare;
 754                 pm_power_off = acpi_power_off;
 755         }
 756         printk(")\n");
 757         /*
 758          * Register the tts_notifier to reboot notifier list so that the _TTS
 759          * object can also be evaluated when the system enters S5.
 760          */
 761         register_reboot_notifier(&tts_notifier);
 762         acpi_gts_bfs_check();
 763         return 0;
 764 }