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#ifndef _LINUX_SUSPEND_H

#define _LINUX_SUSPEND_H

#if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32) || defined(CONFIG_PPC64)

#include <asm/suspend.h>

#endif

#include <linux/swap.h>

#include <linux/notifier.h>

#include <linux/init.h>

#include <linux/pm.h>

#include <linux/mm.h>

#include <asm/errno.h>

#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)

extern int pm_prepare_console(void);

extern void pm_restore_console(void);

#else

static inline int pm_prepare_console(void) { return 0; }

static inline void pm_restore_console(void) {}

#endif

typedef int __bitwise suspend_state_t;

#define PM_SUSPEND_ON           ((__force suspend_state_t) 0)

#define PM_SUSPEND_STANDBY      ((__force suspend_state_t) 1)

#define PM_SUSPEND_MEM          ((__force suspend_state_t) 3)

#define PM_SUSPEND_MAX          ((__force suspend_state_t) 4)

/**

 * struct platform_suspend_ops - Callbacks for managing platform dependent

 *      system sleep states.

 *

 * @valid: Callback to determine if given system sleep state is supported by

 *      the platform.

 *      Valid (ie. supported) states are advertised in /sys/power/state.  Note

 *      that it still may be impossible to enter given system sleep state if the

 *      conditions aren't right.

 *      There is the %suspend_valid_only_mem function available that can be

 *      assigned to this if the platform only supports mem sleep.

 *

 * @set_target: Tell the platform which system sleep state is going to be

 *      entered.

 *      @set_target() is executed right prior to suspending devices.  The

 *      information conveyed to the platform code by @set_target() should be

 *      disregarded by the platform as soon as @finish() is executed and if

 *      @prepare() fails.  If @set_target() fails (ie. returns nonzero),

 *      @prepare(), @enter() and @finish() will not be called by the PM core.

 *      This callback is optional.  However, if it is implemented, the argument

 *      passed to @enter() is meaningless and should be ignored.

 *

 * @prepare: Prepare the platform for entering the system sleep state indicated

 *      by @set_target().

 *      @prepare() is called right after devices have been suspended (ie. the

 *      appropriate .suspend() method has been executed for each device) and

 *      before the nonboot CPUs are disabled (it is executed with IRQs enabled).

 *      This callback is optional.  It returns 0 on success or a negative

 *      error code otherwise, in which case the system cannot enter the desired

 *      sleep state (@enter() and @finish() will not be called in that case).

 *

 * @enter: Enter the system sleep state indicated by @set_target() or

 *      represented by the argument if @set_target() is not implemented.

 *      This callback is mandatory.  It returns 0 on success or a negative

 *      error code otherwise, in which case the system cannot enter the desired

 *      sleep state.

 *

 * @finish: Called when the system has just left a sleep state, right after

 *      the nonboot CPUs have been enabled and before devices are resumed (it is

 *      executed with IRQs enabled).

 *      This callback is optional, but should be implemented by the platforms

 *      that implement @prepare().  If implemented, it is always called after

 *      @enter() (even if @enter() fails).

 */

struct platform_suspend_ops {

        int (*valid)(suspend_state_t state);

        int (*set_target)(suspend_state_t state);

        int (*prepare)(void);

        int (*enter)(suspend_state_t state);

        void (*finish)(void);

};

#ifdef CONFIG_SUSPEND

/**

 * suspend_set_ops - set platform dependent suspend operations

 * @ops: The new suspend operations to set.

 */

extern void suspend_set_ops(struct platform_suspend_ops *ops);

extern int suspend_valid_only_mem(suspend_state_t state);

/**

 * arch_suspend_disable_irqs - disable IRQs for suspend

 *

 * Disables IRQs (in the default case). This is a weak symbol in the common

 * code and thus allows architectures to override it if more needs to be

 * done. Not called for suspend to disk.

 */

extern void arch_suspend_disable_irqs(void);

/**

 * arch_suspend_enable_irqs - enable IRQs after suspend

 *

 * Enables IRQs (in the default case). This is a weak symbol in the common

 * code and thus allows architectures to override it if more needs to be

 * done. Not called for suspend to disk.

 */

extern void arch_suspend_enable_irqs(void);

extern int pm_suspend(suspend_state_t state);

#else /* !CONFIG_SUSPEND */

#define suspend_valid_only_mem  NULL

static inline void suspend_set_ops(struct platform_suspend_ops *ops) {}

static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }

#endif /* !CONFIG_SUSPEND */

/* struct pbe is used for creating lists of pages that should be restored

 * atomically during the resume from disk, because the page frames they have

 * occupied before the suspend are in use.

 */

struct pbe {

        void *address;          /* address of the copy */

        void *orig_address;     /* original address of a page */

        struct pbe *next;

};

/* mm/page_alloc.c */

extern void drain_local_pages(void);

extern void mark_free_pages(struct zone *zone);

/**

 * struct platform_hibernation_ops - hibernation platform support

 *

 * The methods in this structure allow a platform to override the default

 * mechanism of shutting down the machine during a hibernation transition.

 *

 * All three methods must be assigned.

 *

 * @start: Tell the platform driver that we're starting hibernation.

 *      Called right after shrinking memory and before freezing devices.

 *

 * @pre_snapshot: Prepare the platform for creating the hibernation image.

 *      Called right after devices have been frozen and before the nonboot

 *      CPUs are disabled (runs with IRQs on).

 *

 * @finish: Restore the previous state of the platform after the hibernation

 *      image has been created *or* put the platform into the normal operation

 *      mode after the hibernation (the same method is executed in both cases).

 *      Called right after the nonboot CPUs have been enabled and before

 *      thawing devices (runs with IRQs on).

 *

 * @prepare: Prepare the platform for entering the low power state.

 *      Called right after the hibernation image has been saved and before

 *      devices are prepared for entering the low power state.

 *

 * @enter: Put the system into the low power state after the hibernation image

 *      has been saved to disk.

 *      Called after the nonboot CPUs have been disabled and all of the low

 *      level devices have been shut down (runs with IRQs off).

 *

 * @leave: Perform the first stage of the cleanup after the system sleep state

 *      indicated by @set_target() has been left.

 *      Called right after the control has been passed from the boot kernel to

 *      the image kernel, before the nonboot CPUs are enabled and before devices

 *      are resumed.  Executed with interrupts disabled.

 *

 * @pre_restore: Prepare system for the restoration from a hibernation image.

 *      Called right after devices have been frozen and before the nonboot

 *      CPUs are disabled (runs with IRQs on).

 *

 * @restore_cleanup: Clean up after a failing image restoration.

 *      Called right after the nonboot CPUs have been enabled and before

 *      thawing devices (runs with IRQs on).

 */

struct platform_hibernation_ops {

        int (*start)(void);

        int (*pre_snapshot)(void);

        void (*finish)(void);

        int (*prepare)(void);

        int (*enter)(void);

        void (*leave)(void);

        int (*pre_restore)(void);

        void (*restore_cleanup)(void);

};

#ifdef CONFIG_HIBERNATION

/* kernel/power/snapshot.c */

extern void __register_nosave_region(unsigned long b, unsigned long e, int km);

static inline void register_nosave_region(unsigned long b, unsigned long e)

{

        __register_nosave_region(b, e, 0);

}

static inline void register_nosave_region_late(unsigned long b, unsigned long e)

{

        __register_nosave_region(b, e, 1);

}

extern int swsusp_page_is_forbidden(struct page *);

extern void swsusp_set_page_free(struct page *);

extern void swsusp_unset_page_free(struct page *);

extern unsigned long get_safe_page(gfp_t gfp_mask);

extern void hibernation_set_ops(struct platform_hibernation_ops *ops);

extern int hibernate(void);

#else /* CONFIG_HIBERNATION */

static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }

static inline void swsusp_set_page_free(struct page *p) {}

static inline void swsusp_unset_page_free(struct page *p) {}

static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {}

static inline int hibernate(void) { return -ENOSYS; }

#endif /* CONFIG_HIBERNATION */

#ifdef CONFIG_PM_SLEEP

void save_processor_state(void);

void restore_processor_state(void);

struct saved_context;

void __save_processor_state(struct saved_context *ctxt);

void __restore_processor_state(struct saved_context *ctxt);

/* kernel/power/main.c */

extern struct blocking_notifier_head pm_chain_head;

static inline int register_pm_notifier(struct notifier_block *nb)

{

        return blocking_notifier_chain_register(&pm_chain_head, nb);

}

static inline int unregister_pm_notifier(struct notifier_block *nb)

{

        return blocking_notifier_chain_unregister(&pm_chain_head, nb);

}

#define pm_notifier(fn, pri) {                          \

        static struct notifier_block fn##_nb =                  \

                { .notifier_call = fn, .priority = pri };       \

        register_pm_notifier(&fn##_nb);                 \

}

#else /* !CONFIG_PM_SLEEP */

static inline int register_pm_notifier(struct notifier_block *nb)

{

        return 0;

}

static inline int unregister_pm_notifier(struct notifier_block *nb)

{

        return 0;

}

#define pm_notifier(fn, pri)    do { (void)(fn); } while (0)

#endif /* !CONFIG_PM_SLEEP */

#ifndef CONFIG_HIBERNATION

static inline void register_nosave_region(unsigned long b, unsigned long e)

{

}

static inline void register_nosave_region_late(unsigned long b, unsigned long e)

{

}

#endif

#endif /* _LINUX_SUSPEND_H */