linux/drivers/acpi/sleep.c
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   1/*
   2 * sleep.c - ACPI sleep support.
   3 *
   4 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   5 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   6 * Copyright (c) 2000-2003 Patrick Mochel
   7 * Copyright (c) 2003 Open Source Development Lab
   8 *
   9 * This file is released under the GPLv2.
  10 *
  11 */
  12
  13#include <linux/delay.h>
  14#include <linux/irq.h>
  15#include <linux/dmi.h>
  16#include <linux/device.h>
  17#include <linux/suspend.h>
  18#include <linux/reboot.h>
  19#include <linux/acpi.h>
  20#include <linux/module.h>
  21#include <linux/pm_runtime.h>
  22
  23#include <asm/io.h>
  24
  25#include <acpi/acpi_bus.h>
  26#include <acpi/acpi_drivers.h>
  27
  28#include "internal.h"
  29#include "sleep.h"
  30
  31static u8 sleep_states[ACPI_S_STATE_COUNT];
  32
  33static void acpi_sleep_tts_switch(u32 acpi_state)
  34{
  35        union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  36        struct acpi_object_list arg_list = { 1, &in_arg };
  37        acpi_status status = AE_OK;
  38
  39        in_arg.integer.value = acpi_state;
  40        status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  41        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  42                /*
  43                 * OS can't evaluate the _TTS object correctly. Some warning
  44                 * message will be printed. But it won't break anything.
  45                 */
  46                printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  47        }
  48}
  49
  50static int tts_notify_reboot(struct notifier_block *this,
  51                        unsigned long code, void *x)
  52{
  53        acpi_sleep_tts_switch(ACPI_STATE_S5);
  54        return NOTIFY_DONE;
  55}
  56
  57static struct notifier_block tts_notifier = {
  58        .notifier_call  = tts_notify_reboot,
  59        .next           = NULL,
  60        .priority       = 0,
  61};
  62
  63static int acpi_sleep_prepare(u32 acpi_state)
  64{
  65#ifdef CONFIG_ACPI_SLEEP
  66        /* do we have a wakeup address for S2 and S3? */
  67        if (acpi_state == ACPI_STATE_S3) {
  68                if (!acpi_wakeup_address)
  69                        return -EFAULT;
  70                acpi_set_firmware_waking_vector(acpi_wakeup_address);
  71
  72        }
  73        ACPI_FLUSH_CPU_CACHE();
  74#endif
  75        printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  76                acpi_state);
  77        acpi_enable_wakeup_devices(acpi_state);
  78        acpi_enter_sleep_state_prep(acpi_state);
  79        return 0;
  80}
  81
  82#ifdef CONFIG_ACPI_SLEEP
  83static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  84static bool pwr_btn_event_pending;
  85
  86/*
  87 * The ACPI specification wants us to save NVS memory regions during hibernation
  88 * and to restore them during the subsequent resume.  Windows does that also for
  89 * suspend to RAM.  However, it is known that this mechanism does not work on
  90 * all machines, so we allow the user to disable it with the help of the
  91 * 'acpi_sleep=nonvs' kernel command line option.
  92 */
  93static bool nvs_nosave;
  94
  95void __init acpi_nvs_nosave(void)
  96{
  97        nvs_nosave = true;
  98}
  99
 100/*
 101 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 102 * user to request that behavior by using the 'acpi_old_suspend_ordering'
 103 * kernel command line option that causes the following variable to be set.
 104 */
 105static bool old_suspend_ordering;
 106
 107void __init acpi_old_suspend_ordering(void)
 108{
 109        old_suspend_ordering = true;
 110}
 111
 112/**
 113 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 114 */
 115static int acpi_pm_freeze(void)
 116{
 117        acpi_disable_all_gpes();
 118        acpi_os_wait_events_complete();
 119        acpi_ec_block_transactions();
 120        return 0;
 121}
 122
 123/**
 124 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 125 */
 126static int acpi_pm_pre_suspend(void)
 127{
 128        acpi_pm_freeze();
 129        return suspend_nvs_save();
 130}
 131
 132/**
 133 *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 134 *
 135 *      If necessary, set the firmware waking vector and do arch-specific
 136 *      nastiness to get the wakeup code to the waking vector.
 137 */
 138static int __acpi_pm_prepare(void)
 139{
 140        int error = acpi_sleep_prepare(acpi_target_sleep_state);
 141        if (error)
 142                acpi_target_sleep_state = ACPI_STATE_S0;
 143
 144        return error;
 145}
 146
 147/**
 148 *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 149 *              state and disable the GPEs.
 150 */
 151static int acpi_pm_prepare(void)
 152{
 153        int error = __acpi_pm_prepare();
 154        if (!error)
 155                error = acpi_pm_pre_suspend();
 156
 157        return error;
 158}
 159
 160static int find_powerf_dev(struct device *dev, void *data)
 161{
 162        struct acpi_device *device = to_acpi_device(dev);
 163        const char *hid = acpi_device_hid(device);
 164
 165        return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
 166}
 167
 168/**
 169 *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 170 *
 171 *      This is called after we wake back up (or if entering the sleep state
 172 *      failed).
 173 */
 174static void acpi_pm_finish(void)
 175{
 176        struct device *pwr_btn_dev;
 177        u32 acpi_state = acpi_target_sleep_state;
 178
 179        acpi_ec_unblock_transactions();
 180        suspend_nvs_free();
 181
 182        if (acpi_state == ACPI_STATE_S0)
 183                return;
 184
 185        printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 186                acpi_state);
 187        acpi_disable_wakeup_devices(acpi_state);
 188        acpi_leave_sleep_state(acpi_state);
 189
 190        /* reset firmware waking vector */
 191        acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 192
 193        acpi_target_sleep_state = ACPI_STATE_S0;
 194
 195        /* If we were woken with the fixed power button, provide a small
 196         * hint to userspace in the form of a wakeup event on the fixed power
 197         * button device (if it can be found).
 198         *
 199         * We delay the event generation til now, as the PM layer requires
 200         * timekeeping to be running before we generate events. */
 201        if (!pwr_btn_event_pending)
 202                return;
 203
 204        pwr_btn_event_pending = false;
 205        pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
 206                                      find_powerf_dev);
 207        if (pwr_btn_dev) {
 208                pm_wakeup_event(pwr_btn_dev, 0);
 209                put_device(pwr_btn_dev);
 210        }
 211}
 212
 213/**
 214 *      acpi_pm_end - Finish up suspend sequence.
 215 */
 216static void acpi_pm_end(void)
 217{
 218        /*
 219         * This is necessary in case acpi_pm_finish() is not called during a
 220         * failing transition to a sleep state.
 221         */
 222        acpi_target_sleep_state = ACPI_STATE_S0;
 223        acpi_sleep_tts_switch(acpi_target_sleep_state);
 224}
 225#else /* !CONFIG_ACPI_SLEEP */
 226#define acpi_target_sleep_state ACPI_STATE_S0
 227#endif /* CONFIG_ACPI_SLEEP */
 228
 229#ifdef CONFIG_SUSPEND
 230static u32 acpi_suspend_states[] = {
 231        [PM_SUSPEND_ON] = ACPI_STATE_S0,
 232        [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 233        [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 234        [PM_SUSPEND_MAX] = ACPI_STATE_S5
 235};
 236
 237/**
 238 *      acpi_suspend_begin - Set the target system sleep state to the state
 239 *              associated with given @pm_state, if supported.
 240 */
 241static int acpi_suspend_begin(suspend_state_t pm_state)
 242{
 243        u32 acpi_state = acpi_suspend_states[pm_state];
 244        int error = 0;
 245
 246        error = nvs_nosave ? 0 : suspend_nvs_alloc();
 247        if (error)
 248                return error;
 249
 250        if (sleep_states[acpi_state]) {
 251                acpi_target_sleep_state = acpi_state;
 252                acpi_sleep_tts_switch(acpi_target_sleep_state);
 253        } else {
 254                printk(KERN_ERR "ACPI does not support this state: %d\n",
 255                        pm_state);
 256                error = -ENOSYS;
 257        }
 258        return error;
 259}
 260
 261/**
 262 *      acpi_suspend_enter - Actually enter a sleep state.
 263 *      @pm_state: ignored
 264 *
 265 *      Flush caches and go to sleep. For STR we have to call arch-specific
 266 *      assembly, which in turn call acpi_enter_sleep_state().
 267 *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 268 */
 269static int acpi_suspend_enter(suspend_state_t pm_state)
 270{
 271        acpi_status status = AE_OK;
 272        u32 acpi_state = acpi_target_sleep_state;
 273        int error;
 274
 275        ACPI_FLUSH_CPU_CACHE();
 276
 277        switch (acpi_state) {
 278        case ACPI_STATE_S1:
 279                barrier();
 280                status = acpi_enter_sleep_state(acpi_state);
 281                break;
 282
 283        case ACPI_STATE_S3:
 284                error = acpi_suspend_lowlevel();
 285                if (error)
 286                        return error;
 287                pr_info(PREFIX "Low-level resume complete\n");
 288                break;
 289        }
 290
 291        /* This violates the spec but is required for bug compatibility. */
 292        acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 293
 294        /* Reprogram control registers */
 295        acpi_leave_sleep_state_prep(acpi_state);
 296
 297        /* ACPI 3.0 specs (P62) says that it's the responsibility
 298         * of the OSPM to clear the status bit [ implying that the
 299         * POWER_BUTTON event should not reach userspace ]
 300         *
 301         * However, we do generate a small hint for userspace in the form of
 302         * a wakeup event. We flag this condition for now and generate the
 303         * event later, as we're currently too early in resume to be able to
 304         * generate wakeup events.
 305         */
 306        if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 307                acpi_event_status pwr_btn_status;
 308
 309                acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 310
 311                if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
 312                        acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 313                        /* Flag for later */
 314                        pwr_btn_event_pending = true;
 315                }
 316        }
 317
 318        /*
 319         * Disable and clear GPE status before interrupt is enabled. Some GPEs
 320         * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 321         * acpi_leave_sleep_state will reenable specific GPEs later
 322         */
 323        acpi_disable_all_gpes();
 324        /* Allow EC transactions to happen. */
 325        acpi_ec_unblock_transactions_early();
 326
 327        suspend_nvs_restore();
 328
 329        return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 330}
 331
 332static int acpi_suspend_state_valid(suspend_state_t pm_state)
 333{
 334        u32 acpi_state;
 335
 336        switch (pm_state) {
 337        case PM_SUSPEND_ON:
 338        case PM_SUSPEND_STANDBY:
 339        case PM_SUSPEND_MEM:
 340                acpi_state = acpi_suspend_states[pm_state];
 341
 342                return sleep_states[acpi_state];
 343        default:
 344                return 0;
 345        }
 346}
 347
 348static const struct platform_suspend_ops acpi_suspend_ops = {
 349        .valid = acpi_suspend_state_valid,
 350        .begin = acpi_suspend_begin,
 351        .prepare_late = acpi_pm_prepare,
 352        .enter = acpi_suspend_enter,
 353        .wake = acpi_pm_finish,
 354        .end = acpi_pm_end,
 355};
 356
 357/**
 358 *      acpi_suspend_begin_old - Set the target system sleep state to the
 359 *              state associated with given @pm_state, if supported, and
 360 *              execute the _PTS control method.  This function is used if the
 361 *              pre-ACPI 2.0 suspend ordering has been requested.
 362 */
 363static int acpi_suspend_begin_old(suspend_state_t pm_state)
 364{
 365        int error = acpi_suspend_begin(pm_state);
 366        if (!error)
 367                error = __acpi_pm_prepare();
 368
 369        return error;
 370}
 371
 372/*
 373 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 374 * been requested.
 375 */
 376static const struct platform_suspend_ops acpi_suspend_ops_old = {
 377        .valid = acpi_suspend_state_valid,
 378        .begin = acpi_suspend_begin_old,
 379        .prepare_late = acpi_pm_pre_suspend,
 380        .enter = acpi_suspend_enter,
 381        .wake = acpi_pm_finish,
 382        .end = acpi_pm_end,
 383        .recover = acpi_pm_finish,
 384};
 385
 386static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 387{
 388        old_suspend_ordering = true;
 389        return 0;
 390}
 391
 392static int __init init_nvs_nosave(const struct dmi_system_id *d)
 393{
 394        acpi_nvs_nosave();
 395        return 0;
 396}
 397
 398static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 399        {
 400        .callback = init_old_suspend_ordering,
 401        .ident = "Abit KN9 (nForce4 variant)",
 402        .matches = {
 403                DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 404                DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 405                },
 406        },
 407        {
 408        .callback = init_old_suspend_ordering,
 409        .ident = "HP xw4600 Workstation",
 410        .matches = {
 411                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 412                DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 413                },
 414        },
 415        {
 416        .callback = init_old_suspend_ordering,
 417        .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 418        .matches = {
 419                DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 420                DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 421                },
 422        },
 423        {
 424        .callback = init_old_suspend_ordering,
 425        .ident = "Panasonic CF51-2L",
 426        .matches = {
 427                DMI_MATCH(DMI_BOARD_VENDOR,
 428                                "Matsushita Electric Industrial Co.,Ltd."),
 429                DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 430                },
 431        },
 432        {
 433        .callback = init_nvs_nosave,
 434        .ident = "Sony Vaio VGN-FW21E",
 435        .matches = {
 436                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 437                DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 438                },
 439        },
 440        {
 441        .callback = init_nvs_nosave,
 442        .ident = "Sony Vaio VPCEB17FX",
 443        .matches = {
 444                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 445                DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 446                },
 447        },
 448        {
 449        .callback = init_nvs_nosave,
 450        .ident = "Sony Vaio VGN-SR11M",
 451        .matches = {
 452                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 453                DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 454                },
 455        },
 456        {
 457        .callback = init_nvs_nosave,
 458        .ident = "Everex StepNote Series",
 459        .matches = {
 460                DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 461                DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 462                },
 463        },
 464        {
 465        .callback = init_nvs_nosave,
 466        .ident = "Sony Vaio VPCEB1Z1E",
 467        .matches = {
 468                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 469                DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 470                },
 471        },
 472        {
 473        .callback = init_nvs_nosave,
 474        .ident = "Sony Vaio VGN-NW130D",
 475        .matches = {
 476                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 477                DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 478                },
 479        },
 480        {
 481        .callback = init_nvs_nosave,
 482        .ident = "Sony Vaio VPCCW29FX",
 483        .matches = {
 484                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 485                DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 486                },
 487        },
 488        {
 489        .callback = init_nvs_nosave,
 490        .ident = "Averatec AV1020-ED2",
 491        .matches = {
 492                DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 493                DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 494                },
 495        },
 496        {
 497        .callback = init_old_suspend_ordering,
 498        .ident = "Asus A8N-SLI DELUXE",
 499        .matches = {
 500                DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 501                DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 502                },
 503        },
 504        {
 505        .callback = init_old_suspend_ordering,
 506        .ident = "Asus A8N-SLI Premium",
 507        .matches = {
 508                DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 509                DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 510                },
 511        },
 512        {
 513        .callback = init_nvs_nosave,
 514        .ident = "Sony Vaio VGN-SR26GN_P",
 515        .matches = {
 516                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 517                DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 518                },
 519        },
 520        {
 521        .callback = init_nvs_nosave,
 522        .ident = "Sony Vaio VGN-FW520F",
 523        .matches = {
 524                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 525                DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 526                },
 527        },
 528        {
 529        .callback = init_nvs_nosave,
 530        .ident = "Asus K54C",
 531        .matches = {
 532                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 533                DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 534                },
 535        },
 536        {
 537        .callback = init_nvs_nosave,
 538        .ident = "Asus K54HR",
 539        .matches = {
 540                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 541                DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 542                },
 543        },
 544        {},
 545};
 546#endif /* CONFIG_SUSPEND */
 547
 548#ifdef CONFIG_HIBERNATION
 549static unsigned long s4_hardware_signature;
 550static struct acpi_table_facs *facs;
 551static bool nosigcheck;
 552
 553void __init acpi_no_s4_hw_signature(void)
 554{
 555        nosigcheck = true;
 556}
 557
 558static int acpi_hibernation_begin(void)
 559{
 560        int error;
 561
 562        error = nvs_nosave ? 0 : suspend_nvs_alloc();
 563        if (!error) {
 564                acpi_target_sleep_state = ACPI_STATE_S4;
 565                acpi_sleep_tts_switch(acpi_target_sleep_state);
 566        }
 567
 568        return error;
 569}
 570
 571static int acpi_hibernation_enter(void)
 572{
 573        acpi_status status = AE_OK;
 574
 575        ACPI_FLUSH_CPU_CACHE();
 576
 577        /* This shouldn't return.  If it returns, we have a problem */
 578        status = acpi_enter_sleep_state(ACPI_STATE_S4);
 579        /* Reprogram control registers */
 580        acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 581
 582        return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 583}
 584
 585static void acpi_hibernation_leave(void)
 586{
 587        /*
 588         * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 589         * enable it here.
 590         */
 591        acpi_enable();
 592        /* Reprogram control registers */
 593        acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 594        /* Check the hardware signature */
 595        if (facs && s4_hardware_signature != facs->hardware_signature) {
 596                printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 597                        "cannot resume!\n");
 598                panic("ACPI S4 hardware signature mismatch");
 599        }
 600        /* Restore the NVS memory area */
 601        suspend_nvs_restore();
 602        /* Allow EC transactions to happen. */
 603        acpi_ec_unblock_transactions_early();
 604}
 605
 606static void acpi_pm_thaw(void)
 607{
 608        acpi_ec_unblock_transactions();
 609        acpi_enable_all_runtime_gpes();
 610}
 611
 612static const struct platform_hibernation_ops acpi_hibernation_ops = {
 613        .begin = acpi_hibernation_begin,
 614        .end = acpi_pm_end,
 615        .pre_snapshot = acpi_pm_prepare,
 616        .finish = acpi_pm_finish,
 617        .prepare = acpi_pm_prepare,
 618        .enter = acpi_hibernation_enter,
 619        .leave = acpi_hibernation_leave,
 620        .pre_restore = acpi_pm_freeze,
 621        .restore_cleanup = acpi_pm_thaw,
 622};
 623
 624/**
 625 *      acpi_hibernation_begin_old - Set the target system sleep state to
 626 *              ACPI_STATE_S4 and execute the _PTS control method.  This
 627 *              function is used if the pre-ACPI 2.0 suspend ordering has been
 628 *              requested.
 629 */
 630static int acpi_hibernation_begin_old(void)
 631{
 632        int error;
 633        /*
 634         * The _TTS object should always be evaluated before the _PTS object.
 635         * When the old_suspended_ordering is true, the _PTS object is
 636         * evaluated in the acpi_sleep_prepare.
 637         */
 638        acpi_sleep_tts_switch(ACPI_STATE_S4);
 639
 640        error = acpi_sleep_prepare(ACPI_STATE_S4);
 641
 642        if (!error) {
 643                if (!nvs_nosave)
 644                        error = suspend_nvs_alloc();
 645                if (!error)
 646                        acpi_target_sleep_state = ACPI_STATE_S4;
 647        }
 648        return error;
 649}
 650
 651/*
 652 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 653 * been requested.
 654 */
 655static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 656        .begin = acpi_hibernation_begin_old,
 657        .end = acpi_pm_end,
 658        .pre_snapshot = acpi_pm_pre_suspend,
 659        .prepare = acpi_pm_freeze,
 660        .finish = acpi_pm_finish,
 661        .enter = acpi_hibernation_enter,
 662        .leave = acpi_hibernation_leave,
 663        .pre_restore = acpi_pm_freeze,
 664        .restore_cleanup = acpi_pm_thaw,
 665        .recover = acpi_pm_finish,
 666};
 667#endif /* CONFIG_HIBERNATION */
 668
 669int acpi_suspend(u32 acpi_state)
 670{
 671        suspend_state_t states[] = {
 672                [1] = PM_SUSPEND_STANDBY,
 673                [3] = PM_SUSPEND_MEM,
 674                [5] = PM_SUSPEND_MAX
 675        };
 676
 677        if (acpi_state < 6 && states[acpi_state])
 678                return pm_suspend(states[acpi_state]);
 679        if (acpi_state == 4)
 680                return hibernate();
 681        return -EINVAL;
 682}
 683
 684#ifdef CONFIG_PM
 685/**
 686 *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 687 *              in the system sleep state given by %acpi_target_sleep_state
 688 *      @dev: device to examine; its driver model wakeup flags control
 689 *              whether it should be able to wake up the system
 690 *      @d_min_p: used to store the upper limit of allowed states range
 691 *      @d_max_in: specify the lowest allowed states
 692 *      Return value: preferred power state of the device on success, -ENODEV
 693 *      (ie. if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
 694 *
 695 *      Find the lowest power (highest number) ACPI device power state that
 696 *      device @dev can be in while the system is in the sleep state represented
 697 *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 698 *      able to wake up the system from this sleep state.  If @d_min_p is set,
 699 *      the highest power (lowest number) device power state of @dev allowed
 700 *      in this system sleep state is stored at the location pointed to by it.
 701 *
 702 *      The caller must ensure that @dev is valid before using this function.
 703 *      The caller is also responsible for figuring out if the device is
 704 *      supposed to be able to wake up the system and passing this information
 705 *      via @wake.
 706 */
 707
 708int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
 709{
 710        acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 711        struct acpi_device *adev;
 712        char acpi_method[] = "_SxD";
 713        unsigned long long d_min, d_max;
 714
 715        if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
 716                return -EINVAL;
 717        if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 718                printk(KERN_DEBUG "ACPI handle has no context!\n");
 719                return -ENODEV;
 720        }
 721
 722        acpi_method[2] = '0' + acpi_target_sleep_state;
 723        /*
 724         * If the sleep state is S0, the lowest limit from ACPI is D3,
 725         * but if the device has _S0W, we will use the value from _S0W
 726         * as the lowest limit from ACPI.  Finally, we will constrain
 727         * the lowest limit with the specified one.
 728         */
 729        d_min = ACPI_STATE_D0;
 730        d_max = ACPI_STATE_D3;
 731
 732        /*
 733         * If present, _SxD methods return the minimum D-state (highest power
 734         * state) we can use for the corresponding S-states.  Otherwise, the
 735         * minimum D-state is D0 (ACPI 3.x).
 736         *
 737         * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 738         * provided -- that's our fault recovery, we ignore retval.
 739         */
 740        if (acpi_target_sleep_state > ACPI_STATE_S0)
 741                acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 742
 743        /*
 744         * If _PRW says we can wake up the system from the target sleep state,
 745         * the D-state returned by _SxD is sufficient for that (we assume a
 746         * wakeup-aware driver if wake is set).  Still, if _SxW exists
 747         * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 748         * can wake the system.  _S0W may be valid, too.
 749         */
 750        if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 751            (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
 752             adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
 753                acpi_status status;
 754
 755                acpi_method[3] = 'W';
 756                status = acpi_evaluate_integer(handle, acpi_method, NULL,
 757                                                &d_max);
 758                if (ACPI_FAILURE(status)) {
 759                        if (acpi_target_sleep_state != ACPI_STATE_S0 ||
 760                            status != AE_NOT_FOUND)
 761                                d_max = d_min;
 762                } else if (d_max < d_min) {
 763                        /* Warn the user of the broken DSDT */
 764                        printk(KERN_WARNING "ACPI: Wrong value from %s\n",
 765                                acpi_method);
 766                        /* Sanitize it */
 767                        d_min = d_max;
 768                }
 769        }
 770
 771        if (d_max_in < d_min)
 772                return -EINVAL;
 773        if (d_min_p)
 774                *d_min_p = d_min;
 775        /* constrain d_max with specified lowest limit (max number) */
 776        if (d_max > d_max_in) {
 777                for (d_max = d_max_in; d_max > d_min; d_max--) {
 778                        if (adev->power.states[d_max].flags.valid)
 779                                break;
 780                }
 781        }
 782        return d_max;
 783}
 784EXPORT_SYMBOL(acpi_pm_device_sleep_state);
 785#endif /* CONFIG_PM */
 786
 787#ifdef CONFIG_PM_SLEEP
 788/**
 789 * acpi_pm_device_run_wake - Enable/disable wake-up for given device.
 790 * @phys_dev: Device to enable/disable the platform to wake-up the system for.
 791 * @enable: Whether enable or disable the wake-up functionality.
 792 *
 793 * Find the ACPI device object corresponding to @pci_dev and try to
 794 * enable/disable the GPE associated with it.
 795 */
 796int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
 797{
 798        struct acpi_device *dev;
 799        acpi_handle handle;
 800
 801        if (!device_run_wake(phys_dev))
 802                return -EINVAL;
 803
 804        handle = DEVICE_ACPI_HANDLE(phys_dev);
 805        if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
 806                dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
 807                        __func__);
 808                return -ENODEV;
 809        }
 810
 811        if (enable) {
 812                acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
 813                acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
 814        } else {
 815                acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
 816                acpi_disable_wakeup_device_power(dev);
 817        }
 818
 819        return 0;
 820}
 821EXPORT_SYMBOL(acpi_pm_device_run_wake);
 822
 823/**
 824 *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
 825 *                                  capability of given device
 826 *      @dev: device to handle
 827 *      @enable: 'true' - enable, 'false' - disable the wake-up capability
 828 */
 829int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 830{
 831        acpi_handle handle;
 832        struct acpi_device *adev;
 833        int error;
 834
 835        if (!device_can_wakeup(dev))
 836                return -EINVAL;
 837
 838        handle = DEVICE_ACPI_HANDLE(dev);
 839        if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 840                dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
 841                return -ENODEV;
 842        }
 843
 844        error = enable ?
 845                acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
 846                acpi_disable_wakeup_device_power(adev);
 847        if (!error)
 848                dev_info(dev, "wake-up capability %s by ACPI\n",
 849                                enable ? "enabled" : "disabled");
 850
 851        return error;
 852}
 853#endif  /* CONFIG_PM_SLEEP */
 854
 855static void acpi_power_off_prepare(void)
 856{
 857        /* Prepare to power off the system */
 858        acpi_sleep_prepare(ACPI_STATE_S5);
 859        acpi_disable_all_gpes();
 860}
 861
 862static void acpi_power_off(void)
 863{
 864        /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 865        printk(KERN_DEBUG "%s called\n", __func__);
 866        local_irq_disable();
 867        acpi_enter_sleep_state(ACPI_STATE_S5);
 868}
 869
 870int __init acpi_sleep_init(void)
 871{
 872        acpi_status status;
 873        u8 type_a, type_b;
 874#ifdef CONFIG_SUSPEND
 875        int i = 0;
 876
 877        dmi_check_system(acpisleep_dmi_table);
 878#endif
 879
 880        if (acpi_disabled)
 881                return 0;
 882
 883        sleep_states[ACPI_STATE_S0] = 1;
 884        printk(KERN_INFO PREFIX "(supports S0");
 885
 886#ifdef CONFIG_SUSPEND
 887        for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 888                status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 889                if (ACPI_SUCCESS(status)) {
 890                        sleep_states[i] = 1;
 891                        printk(KERN_CONT " S%d", i);
 892                }
 893        }
 894
 895        suspend_set_ops(old_suspend_ordering ?
 896                &acpi_suspend_ops_old : &acpi_suspend_ops);
 897#endif
 898
 899#ifdef CONFIG_HIBERNATION
 900        status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 901        if (ACPI_SUCCESS(status)) {
 902                hibernation_set_ops(old_suspend_ordering ?
 903                        &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 904                sleep_states[ACPI_STATE_S4] = 1;
 905                printk(KERN_CONT " S4");
 906                if (!nosigcheck) {
 907                        acpi_get_table(ACPI_SIG_FACS, 1,
 908                                (struct acpi_table_header **)&facs);
 909                        if (facs)
 910                                s4_hardware_signature =
 911                                        facs->hardware_signature;
 912                }
 913        }
 914#endif
 915        status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 916        if (ACPI_SUCCESS(status)) {
 917                sleep_states[ACPI_STATE_S5] = 1;
 918                printk(KERN_CONT " S5");
 919                pm_power_off_prepare = acpi_power_off_prepare;
 920                pm_power_off = acpi_power_off;
 921        }
 922        printk(KERN_CONT ")\n");
 923        /*
 924         * Register the tts_notifier to reboot notifier list so that the _TTS
 925         * object can also be evaluated when the system enters S5.
 926         */
 927        register_reboot_notifier(&tts_notifier);
 928        return 0;
 929}
 930
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