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[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / include / linux / pm.h

/*
 *  pm.h - Power management interface
 *
 *  Copyright (C) 2000 Andrew Henroid
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _LINUX_PM_H
#define _LINUX_PM_H

#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/timer.h>
#include <linux/completion.h>

/*
 * Callbacks for platform drivers to implement.
 */
extern void (*pm_idle)(void);
extern void (*pm_power_off)(void);
extern void (*pm_power_off_prepare)(void);

/*
 * Device power management
 */

struct device;

typedef struct pm_message {
        int event;
} pm_message_t;


struct dev_pm_ops {
        int (*prepare)(struct device *dev);
        void (*complete)(struct device *dev);
        int (*suspend)(struct device *dev);
        int (*resume)(struct device *dev);
        int (*freeze)(struct device *dev);
        int (*thaw)(struct device *dev);
        int (*poweroff)(struct device *dev);
        int (*restore)(struct device *dev);
        int (*suspend_noirq)(struct device *dev);
        int (*resume_noirq)(struct device *dev);
        int (*freeze_noirq)(struct device *dev);
        int (*thaw_noirq)(struct device *dev);
        int (*poweroff_noirq)(struct device *dev);
        int (*restore_noirq)(struct device *dev);
        int (*runtime_suspend)(struct device *dev);
        int (*runtime_resume)(struct device *dev);
        int (*runtime_idle)(struct device *dev);
};

#ifdef CONFIG_PM_SLEEP
#define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
        .suspend = suspend_fn, \
        .resume = resume_fn, \
        .freeze = suspend_fn, \
        .thaw = resume_fn, \
        .poweroff = suspend_fn, \
        .restore = resume_fn,
#else
#define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
#endif

#ifdef CONFIG_PM_RUNTIME
#define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
        .runtime_suspend = suspend_fn, \
        .runtime_resume = resume_fn, \
        .runtime_idle = idle_fn,
#else
#define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn)
#endif

/*
 * Use this if you want to use the same suspend and resume callbacks for suspend
 * to RAM and hibernation.
 */
#define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
const struct dev_pm_ops name = { \
        SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
}

/*
 * Use this for defining a set of PM operations to be used in all situations
 * (sustem suspend, hibernation or runtime PM).
 */
#define UNIVERSAL_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
const struct dev_pm_ops name = { \
        SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
        SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
}

/*
 * Use this for subsystems (bus types, device types, device classes) that don't
 * need any special suspend/resume handling in addition to invoking the PM
 * callbacks provided by device drivers supporting both the system sleep PM and
 * runtime PM, make the pm member point to generic_subsys_pm_ops.
 */
#ifdef CONFIG_PM_OPS
extern struct dev_pm_ops generic_subsys_pm_ops;
#define GENERIC_SUBSYS_PM_OPS   (&generic_subsys_pm_ops)
#else
#define GENERIC_SUBSYS_PM_OPS   NULL
#endif

/**
 * PM_EVENT_ messages
 *
 * The following PM_EVENT_ messages are defined for the internal use of the PM
 * core, in order to provide a mechanism allowing the high level suspend and
 * hibernation code to convey the necessary information to the device PM core
 * code:
 *
 * ON           No transition.
 *
 * FREEZE       System is going to hibernate, call ->prepare() and ->freeze()
 *              for all devices.
 *
 * SUSPEND      System is going to suspend, call ->prepare() and ->suspend()
 *              for all devices.
 *
 * HIBERNATE    Hibernation image has been saved, call ->prepare() and
 *              ->poweroff() for all devices.
 *
 * QUIESCE      Contents of main memory are going to be restored from a (loaded)
 *              hibernation image, call ->prepare() and ->freeze() for all
 *              devices.
 *
 * RESUME       System is resuming, call ->resume() and ->complete() for all
 *              devices.
 *
 * THAW         Hibernation image has been created, call ->thaw() and
 *              ->complete() for all devices.
 *
 * RESTORE      Contents of main memory have been restored from a hibernation
 *              image, call ->restore() and ->complete() for all devices.
 *
 * RECOVER      Creation of a hibernation image or restoration of the main
 *              memory contents from a hibernation image has failed, call
 *              ->thaw() and ->complete() for all devices.
 *
 * The following PM_EVENT_ messages are defined for internal use by
 * kernel subsystems.  They are never issued by the PM core.
 *
 * USER_SUSPEND         Manual selective suspend was issued by userspace.
 *
 * USER_RESUME          Manual selective resume was issued by userspace.
 *
 * REMOTE_WAKEUP        Remote-wakeup request was received from the device.
 *
 * AUTO_SUSPEND         Automatic (device idle) runtime suspend was
 *                      initiated by the subsystem.
 *
 * AUTO_RESUME          Automatic (device needed) runtime resume was
 *                      requested by a driver.
 */

#define PM_EVENT_ON             0x0000
#define PM_EVENT_FREEZE         0x0001
#define PM_EVENT_SUSPEND        0x0002
#define PM_EVENT_HIBERNATE      0x0004
#define PM_EVENT_QUIESCE        0x0008
#define PM_EVENT_RESUME         0x0010
#define PM_EVENT_THAW           0x0020
#define PM_EVENT_RESTORE        0x0040
#define PM_EVENT_RECOVER        0x0080
#define PM_EVENT_USER           0x0100
#define PM_EVENT_REMOTE         0x0200
#define PM_EVENT_AUTO           0x0400

#define PM_EVENT_SLEEP          (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
#define PM_EVENT_USER_SUSPEND   (PM_EVENT_USER | PM_EVENT_SUSPEND)
#define PM_EVENT_USER_RESUME    (PM_EVENT_USER | PM_EVENT_RESUME)
#define PM_EVENT_REMOTE_RESUME  (PM_EVENT_REMOTE | PM_EVENT_RESUME)
#define PM_EVENT_AUTO_SUSPEND   (PM_EVENT_AUTO | PM_EVENT_SUSPEND)
#define PM_EVENT_AUTO_RESUME    (PM_EVENT_AUTO | PM_EVENT_RESUME)

#define PMSG_ON         ((struct pm_message){ .event = PM_EVENT_ON, })
#define PMSG_FREEZE     ((struct pm_message){ .event = PM_EVENT_FREEZE, })
#define PMSG_QUIESCE    ((struct pm_message){ .event = PM_EVENT_QUIESCE, })
#define PMSG_SUSPEND    ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
#define PMSG_HIBERNATE  ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
#define PMSG_RESUME     ((struct pm_message){ .event = PM_EVENT_RESUME, })
#define PMSG_THAW       ((struct pm_message){ .event = PM_EVENT_THAW, })
#define PMSG_RESTORE    ((struct pm_message){ .event = PM_EVENT_RESTORE, })
#define PMSG_RECOVER    ((struct pm_message){ .event = PM_EVENT_RECOVER, })
#define PMSG_USER_SUSPEND       ((struct pm_message) \
                                        { .event = PM_EVENT_USER_SUSPEND, })
#define PMSG_USER_RESUME        ((struct pm_message) \
                                        { .event = PM_EVENT_USER_RESUME, })
#define PMSG_REMOTE_RESUME      ((struct pm_message) \
                                        { .event = PM_EVENT_REMOTE_RESUME, })
#define PMSG_AUTO_SUSPEND       ((struct pm_message) \
                                        { .event = PM_EVENT_AUTO_SUSPEND, })
#define PMSG_AUTO_RESUME        ((struct pm_message) \
                                        { .event = PM_EVENT_AUTO_RESUME, })

/**
 * Device power management states
 *
 * These state labels are used internally by the PM core to indicate the current
 * status of a device with respect to the PM core operations.
 *
 * DPM_ON               Device is regarded as operational.  Set this way
 *                      initially and when ->complete() is about to be called.
 *                      Also set when ->prepare() fails.
 *
 * DPM_PREPARING        Device is going to be prepared for a PM transition.  Set
 *                      when ->prepare() is about to be called.
 *
 * DPM_RESUMING         Device is going to be resumed.  Set when ->resume(),
 *                      ->thaw(), or ->restore() is about to be called.
 *
 * DPM_SUSPENDING       Device has been prepared for a power transition.  Set
 *                      when ->prepare() has just succeeded.
 *
 * DPM_OFF              Device is regarded as inactive.  Set immediately after
 *                      ->suspend(), ->freeze(), or ->poweroff() has succeeded.
 *                      Also set when ->resume()_noirq, ->thaw_noirq(), or
 *                      ->restore_noirq() is about to be called.
 *
 * DPM_OFF_IRQ          Device is in a "deep sleep".  Set immediately after
 *                      ->suspend_noirq(), ->freeze_noirq(), or
 *                      ->poweroff_noirq() has just succeeded.
 */

enum dpm_state {
        DPM_INVALID,
        DPM_ON,
        DPM_PREPARING,
        DPM_RESUMING,
        DPM_SUSPENDING,
        DPM_OFF,
        DPM_OFF_IRQ,
};

/**
 * Device run-time power management status.
 *
 * These status labels are used internally by the PM core to indicate the
 * current status of a device with respect to the PM core operations.  They do
 * not reflect the actual power state of the device or its status as seen by the
 * driver.
 *
 * RPM_ACTIVE           Device is fully operational.  Indicates that the device
 *                      bus type's ->runtime_resume() callback has completed
 *                      successfully.
 *
 * RPM_SUSPENDED        Device bus type's ->runtime_suspend() callback has
 *                      completed successfully.  The device is regarded as
 *                      suspended.
 *
 * RPM_RESUMING         Device bus type's ->runtime_resume() callback is being
 *                      executed.
 *
 * RPM_SUSPENDING       Device bus type's ->runtime_suspend() callback is being
 *                      executed.
 */

enum rpm_status {
        RPM_ACTIVE = 0,
        RPM_RESUMING,
        RPM_SUSPENDED,
        RPM_SUSPENDING,
};

/**
 * Device run-time power management request types.
 *
 * RPM_REQ_NONE         Do nothing.
 *
 * RPM_REQ_IDLE         Run the device bus type's ->runtime_idle() callback
 *
 * RPM_REQ_SUSPEND      Run the device bus type's ->runtime_suspend() callback
 *
 * RPM_REQ_RESUME       Run the device bus type's ->runtime_resume() callback
 */

enum rpm_request {
        RPM_REQ_NONE = 0,
        RPM_REQ_IDLE,
        RPM_REQ_SUSPEND,
        RPM_REQ_RESUME,
};

struct dev_pm_info {
        pm_message_t            power_state;
        unsigned int            can_wakeup:1;
        unsigned int            should_wakeup:1;
        unsigned                async_suspend:1;
        enum dpm_state          status;         /* Owned by the PM core */
#ifdef CONFIG_PM_SLEEP
        struct list_head        entry;
        struct completion       completion;
        unsigned long           wakeup_count;
#endif
#ifdef CONFIG_PM_RUNTIME
        struct timer_list       suspend_timer;
        unsigned long           timer_expires;
        struct work_struct      work;
        wait_queue_head_t       wait_queue;
        spinlock_t              lock;
        atomic_t                usage_count;
        atomic_t                child_count;
        unsigned int            disable_depth:3;
        unsigned int            ignore_children:1;
        unsigned int            idle_notification:1;
        unsigned int            request_pending:1;
        unsigned int            deferred_resume:1;
        unsigned int            run_wake:1;
        unsigned int            runtime_auto:1;
        enum rpm_request        request;
        enum rpm_status         runtime_status;
        int                     runtime_error;
        unsigned long           active_jiffies;
        unsigned long           suspended_jiffies;
        unsigned long           accounting_timestamp;
#endif
};

extern void update_pm_runtime_accounting(struct device *dev);


/*
 * The PM_EVENT_ messages are also used by drivers implementing the legacy
 * suspend framework, based on the ->suspend() and ->resume() callbacks common
 * for suspend and hibernation transitions, according to the rules below.
 */

/* Necessary, because several drivers use PM_EVENT_PRETHAW */
#define PM_EVENT_PRETHAW PM_EVENT_QUIESCE

/*
 * One transition is triggered by resume(), after a suspend() call; the
 * message is implicit:
 *
 * ON           Driver starts working again, responding to hardware events
 *              and software requests.  The hardware may have gone through
 *              a power-off reset, or it may have maintained state from the
 *              previous suspend() which the driver will rely on while
 *              resuming.  On most platforms, there are no restrictions on
 *              availability of resources like clocks during resume().
 *
 * Other transitions are triggered by messages sent using suspend().  All
 * these transitions quiesce the driver, so that I/O queues are inactive.
 * That commonly entails turning off IRQs and DMA; there may be rules
 * about how to quiesce that are specific to the bus or the device's type.
 * (For example, network drivers mark the link state.)  Other details may
 * differ according to the message:
 *
 * SUSPEND      Quiesce, enter a low power device state appropriate for
 *              the upcoming system state (such as PCI_D3hot), and enable
 *              wakeup events as appropriate.
 *
 * HIBERNATE    Enter a low power device state appropriate for the hibernation
 *              state (eg. ACPI S4) and enable wakeup events as appropriate.
 *
 * FREEZE       Quiesce operations so that a consistent image can be saved;
 *              but do NOT otherwise enter a low power device state, and do
 *              NOT emit system wakeup events.
 *
 * PRETHAW      Quiesce as if for FREEZE; additionally, prepare for restoring
 *              the system from a snapshot taken after an earlier FREEZE.
 *              Some drivers will need to reset their hardware state instead
 *              of preserving it, to ensure that it's never mistaken for the
 *              state which that earlier snapshot had set up.
 *
 * A minimally power-aware driver treats all messages as SUSPEND, fully
 * reinitializes its device during resume() -- whether or not it was reset
 * during the suspend/resume cycle -- and can't issue wakeup events.
 *
 * More power-aware drivers may also use low power states at runtime as
 * well as during system sleep states like PM_SUSPEND_STANDBY.  They may
 * be able to use wakeup events to exit from runtime low-power states,
 * or from system low-power states such as standby or suspend-to-RAM.
 */

#ifdef CONFIG_PM_SLEEP
extern void device_pm_lock(void);
extern int sysdev_resume(void);
extern void dpm_resume_noirq(pm_message_t state);
extern void dpm_resume_end(pm_message_t state);

extern void device_pm_unlock(void);
extern int sysdev_suspend(pm_message_t state);
extern int dpm_suspend_noirq(pm_message_t state);
extern int dpm_suspend_start(pm_message_t state);

extern void __suspend_report_result(const char *function, void *fn, int ret);

#define suspend_report_result(fn, ret)                                  \
        do {                                                            \
                __suspend_report_result(__func__, fn, ret);             \
        } while (0)

extern void device_pm_wait_for_dev(struct device *sub, struct device *dev);

/* drivers/base/power/wakeup.c */
extern void pm_wakeup_event(struct device *dev, unsigned int msec);
extern void pm_stay_awake(struct device *dev);
extern void pm_relax(void);
#else /* !CONFIG_PM_SLEEP */

#define device_pm_lock() do {} while (0)
#define device_pm_unlock() do {} while (0)

static inline int dpm_suspend_start(pm_message_t state)
{
        return 0;
}

#define suspend_report_result(fn, ret)          do {} while (0)

static inline void device_pm_wait_for_dev(struct device *a, struct device *b) {}

static inline void pm_wakeup_event(struct device *dev, unsigned int msec) {}
static inline void pm_stay_awake(struct device *dev) {}
static inline void pm_relax(void) {}
#endif /* !CONFIG_PM_SLEEP */

/* How to reorder dpm_list after device_move() */
enum dpm_order {
        DPM_ORDER_NONE,
        DPM_ORDER_DEV_AFTER_PARENT,
        DPM_ORDER_PARENT_BEFORE_DEV,
        DPM_ORDER_DEV_LAST,
};

/*
 * Global Power Management flags
 * Used to keep APM and ACPI from both being active
 */
extern unsigned int     pm_flags;

#define PM_APM  1
#define PM_ACPI 2

#endif /* _LINUX_PM_H */