422 lines
17 KiB
C
422 lines
17 KiB
C
/*
|
|
* 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>
|
|
|
|
/*
|
|
* 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 - device PM callbacks
|
|
*
|
|
* Several driver power state transitions are externally visible, affecting
|
|
* the state of pending I/O queues and (for drivers that touch hardware)
|
|
* interrupts, wakeups, DMA, and other hardware state. There may also be
|
|
* internal transitions to various low power modes, which are transparent
|
|
* to the rest of the driver stack (such as a driver that's ON gating off
|
|
* clocks which are not in active use).
|
|
*
|
|
* The externally visible transitions are handled with the help of the following
|
|
* callbacks included in this structure:
|
|
*
|
|
* @prepare: Prepare the device for the upcoming transition, but do NOT change
|
|
* its hardware state. Prevent new children of the device from being
|
|
* registered after @prepare() returns (the driver's subsystem and
|
|
* generally the rest of the kernel is supposed to prevent new calls to the
|
|
* probe method from being made too once @prepare() has succeeded). If
|
|
* @prepare() detects a situation it cannot handle (e.g. registration of a
|
|
* child already in progress), it may return -EAGAIN, so that the PM core
|
|
* can execute it once again (e.g. after the new child has been registered)
|
|
* to recover from the race condition. This method is executed for all
|
|
* kinds of suspend transitions and is followed by one of the suspend
|
|
* callbacks: @suspend(), @freeze(), or @poweroff().
|
|
* The PM core executes @prepare() for all devices before starting to
|
|
* execute suspend callbacks for any of them, so drivers may assume all of
|
|
* the other devices to be present and functional while @prepare() is being
|
|
* executed. In particular, it is safe to make GFP_KERNEL memory
|
|
* allocations from within @prepare(). However, drivers may NOT assume
|
|
* anything about the availability of the user space at that time and it
|
|
* is not correct to request firmware from within @prepare() (it's too
|
|
* late to do that). [To work around this limitation, drivers may
|
|
* register suspend and hibernation notifiers that are executed before the
|
|
* freezing of tasks.]
|
|
*
|
|
* @complete: Undo the changes made by @prepare(). This method is executed for
|
|
* all kinds of resume transitions, following one of the resume callbacks:
|
|
* @resume(), @thaw(), @restore(). Also called if the state transition
|
|
* fails before the driver's suspend callback (@suspend(), @freeze(),
|
|
* @poweroff()) can be executed (e.g. if the suspend callback fails for one
|
|
* of the other devices that the PM core has unsuccessfully attempted to
|
|
* suspend earlier).
|
|
* The PM core executes @complete() after it has executed the appropriate
|
|
* resume callback for all devices.
|
|
*
|
|
* @suspend: Executed before putting the system into a sleep state in which the
|
|
* contents of main memory are preserved. Quiesce the device, put it into
|
|
* a low power state appropriate for the upcoming system state (such as
|
|
* PCI_D3hot), and enable wakeup events as appropriate.
|
|
*
|
|
* @resume: Executed after waking the system up from a sleep state in which the
|
|
* contents of main memory were preserved. Put the device into the
|
|
* appropriate state, according to the information saved in memory by the
|
|
* preceding @suspend(). The 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 may rely on while resuming. On most
|
|
* platforms, there are no restrictions on availability of resources like
|
|
* clocks during @resume().
|
|
*
|
|
* @freeze: Hibernation-specific, executed before creating a hibernation image.
|
|
* Quiesce operations so that a consistent image can be created, but do NOT
|
|
* otherwise put the device into a low power device state and do NOT emit
|
|
* system wakeup events. Save in main memory the device settings to be
|
|
* used by @restore() during the subsequent resume from hibernation or by
|
|
* the subsequent @thaw(), if the creation of the image or the restoration
|
|
* of main memory contents from it fails.
|
|
*
|
|
* @thaw: Hibernation-specific, executed after creating a hibernation image OR
|
|
* if the creation of the image fails. Also executed after a failing
|
|
* attempt to restore the contents of main memory from such an image.
|
|
* Undo the changes made by the preceding @freeze(), so the device can be
|
|
* operated in the same way as immediately before the call to @freeze().
|
|
*
|
|
* @poweroff: Hibernation-specific, executed after saving a hibernation image.
|
|
* Quiesce the device, put it into a low power state appropriate for the
|
|
* upcoming system state (such as PCI_D3hot), and enable wakeup events as
|
|
* appropriate.
|
|
*
|
|
* @restore: Hibernation-specific, executed after restoring the contents of main
|
|
* memory from a hibernation image. Driver starts working again,
|
|
* responding to hardware events and software requests. Drivers may NOT
|
|
* make ANY assumptions about the hardware state right prior to @restore().
|
|
* On most platforms, there are no restrictions on availability of
|
|
* resources like clocks during @restore().
|
|
*
|
|
* @suspend_noirq: Complete the operations of ->suspend() by carrying out any
|
|
* actions required for suspending the device that need interrupts to be
|
|
* disabled
|
|
*
|
|
* @resume_noirq: Prepare for the execution of ->resume() by carrying out any
|
|
* actions required for resuming the device that need interrupts to be
|
|
* disabled
|
|
*
|
|
* @freeze_noirq: Complete the operations of ->freeze() by carrying out any
|
|
* actions required for freezing the device that need interrupts to be
|
|
* disabled
|
|
*
|
|
* @thaw_noirq: Prepare for the execution of ->thaw() by carrying out any
|
|
* actions required for thawing the device that need interrupts to be
|
|
* disabled
|
|
*
|
|
* @poweroff_noirq: Complete the operations of ->poweroff() by carrying out any
|
|
* actions required for handling the device that need interrupts to be
|
|
* disabled
|
|
*
|
|
* @restore_noirq: Prepare for the execution of ->restore() by carrying out any
|
|
* actions required for restoring the operations of the device that need
|
|
* interrupts to be disabled
|
|
*
|
|
* All of the above callbacks, except for @complete(), return error codes.
|
|
* However, the error codes returned by the resume operations, @resume(),
|
|
* @thaw(), @restore(), @resume_noirq(), @thaw_noirq(), and @restore_noirq() do
|
|
* not cause the PM core to abort the resume transition during which they are
|
|
* returned. The error codes returned in that cases are only printed by the PM
|
|
* core to the system logs for debugging purposes. Still, it is recommended
|
|
* that drivers only return error codes from their resume methods in case of an
|
|
* unrecoverable failure (i.e. when the device being handled refuses to resume
|
|
* and becomes unusable) to allow us to modify the PM core in the future, so
|
|
* that it can avoid attempting to handle devices that failed to resume and
|
|
* their children.
|
|
*
|
|
* It is allowed to unregister devices while the above callbacks are being
|
|
* executed. However, it is not allowed to unregister a device from within any
|
|
* of its own callbacks.
|
|
*/
|
|
|
|
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);
|
|
};
|
|
|
|
/**
|
|
* 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,
|
|
};
|
|
|
|
struct dev_pm_info {
|
|
pm_message_t power_state;
|
|
unsigned can_wakeup:1;
|
|
unsigned should_wakeup:1;
|
|
enum dpm_state status; /* Owned by the PM core */
|
|
#ifdef CONFIG_PM_SLEEP
|
|
struct list_head entry;
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* 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 device_power_up(pm_message_t state);
|
|
extern void device_resume(pm_message_t state);
|
|
|
|
extern void device_pm_unlock(void);
|
|
extern int sysdev_suspend(pm_message_t state);
|
|
extern int device_power_down(pm_message_t state);
|
|
extern int device_suspend(pm_message_t state);
|
|
extern int device_prepare_suspend(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)
|
|
|
|
#else /* !CONFIG_PM_SLEEP */
|
|
|
|
static inline int device_suspend(pm_message_t state)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#define suspend_report_result(fn, ret) do {} while (0)
|
|
|
|
#endif /* !CONFIG_PM_SLEEP */
|
|
|
|
/*
|
|
* 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 */
|