432 строки
17 KiB
C
432 строки
17 KiB
C
/*
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* pm.h - Power management interface
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*
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* Copyright (C) 2000 Andrew Henroid
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_PM_H
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#define _LINUX_PM_H
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#include <linux/list.h>
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/*
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* Callbacks for platform drivers to implement.
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*/
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extern void (*pm_idle)(void);
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extern void (*pm_power_off)(void);
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extern void (*pm_power_off_prepare)(void);
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/*
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* Device power management
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*/
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struct device;
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typedef struct pm_message {
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int event;
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} pm_message_t;
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/**
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* struct dev_pm_ops - device PM callbacks
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*
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* Several driver power state transitions are externally visible, affecting
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* the state of pending I/O queues and (for drivers that touch hardware)
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* interrupts, wakeups, DMA, and other hardware state. There may also be
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* internal transitions to various low power modes, which are transparent
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* to the rest of the driver stack (such as a driver that's ON gating off
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* clocks which are not in active use).
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*
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* The externally visible transitions are handled with the help of the following
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* callbacks included in this structure:
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*
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* @prepare: Prepare the device for the upcoming transition, but do NOT change
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* its hardware state. Prevent new children of the device from being
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* registered after @prepare() returns (the driver's subsystem and
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* generally the rest of the kernel is supposed to prevent new calls to the
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* probe method from being made too once @prepare() has succeeded). If
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* @prepare() detects a situation it cannot handle (e.g. registration of a
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* child already in progress), it may return -EAGAIN, so that the PM core
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* can execute it once again (e.g. after the new child has been registered)
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* to recover from the race condition. This method is executed for all
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* kinds of suspend transitions and is followed by one of the suspend
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* callbacks: @suspend(), @freeze(), or @poweroff().
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* The PM core executes @prepare() for all devices before starting to
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* execute suspend callbacks for any of them, so drivers may assume all of
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* the other devices to be present and functional while @prepare() is being
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* executed. In particular, it is safe to make GFP_KERNEL memory
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* allocations from within @prepare(). However, drivers may NOT assume
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* anything about the availability of the user space at that time and it
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* is not correct to request firmware from within @prepare() (it's too
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* late to do that). [To work around this limitation, drivers may
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* register suspend and hibernation notifiers that are executed before the
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* freezing of tasks.]
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*
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* @complete: Undo the changes made by @prepare(). This method is executed for
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* all kinds of resume transitions, following one of the resume callbacks:
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* @resume(), @thaw(), @restore(). Also called if the state transition
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* fails before the driver's suspend callback (@suspend(), @freeze(),
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* @poweroff()) can be executed (e.g. if the suspend callback fails for one
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* of the other devices that the PM core has unsuccessfully attempted to
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* suspend earlier).
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* The PM core executes @complete() after it has executed the appropriate
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* resume callback for all devices.
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*
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* @suspend: Executed before putting the system into a sleep state in which the
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* contents of main memory are preserved. Quiesce the device, put it into
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* a low power state appropriate for the upcoming system state (such as
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* PCI_D3hot), and enable wakeup events as appropriate.
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*
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* @resume: Executed after waking the system up from a sleep state in which the
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* contents of main memory were preserved. Put the device into the
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* appropriate state, according to the information saved in memory by the
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* preceding @suspend(). The driver starts working again, responding to
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* hardware events and software requests. The hardware may have gone
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* through a power-off reset, or it may have maintained state from the
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* previous suspend() which the driver may rely on while resuming. On most
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* platforms, there are no restrictions on availability of resources like
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* clocks during @resume().
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*
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* @freeze: Hibernation-specific, executed before creating a hibernation image.
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* Quiesce operations so that a consistent image can be created, but do NOT
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* otherwise put the device into a low power device state and do NOT emit
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* system wakeup events. Save in main memory the device settings to be
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* used by @restore() during the subsequent resume from hibernation or by
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* the subsequent @thaw(), if the creation of the image or the restoration
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* of main memory contents from it fails.
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*
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* @thaw: Hibernation-specific, executed after creating a hibernation image OR
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* if the creation of the image fails. Also executed after a failing
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* attempt to restore the contents of main memory from such an image.
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* Undo the changes made by the preceding @freeze(), so the device can be
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* operated in the same way as immediately before the call to @freeze().
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*
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* @poweroff: Hibernation-specific, executed after saving a hibernation image.
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* Quiesce the device, put it into a low power state appropriate for the
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* upcoming system state (such as PCI_D3hot), and enable wakeup events as
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* appropriate.
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*
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* @restore: Hibernation-specific, executed after restoring the contents of main
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* memory from a hibernation image. Driver starts working again,
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* responding to hardware events and software requests. Drivers may NOT
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* make ANY assumptions about the hardware state right prior to @restore().
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* On most platforms, there are no restrictions on availability of
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* resources like clocks during @restore().
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*
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* @suspend_noirq: Complete the operations of ->suspend() by carrying out any
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* actions required for suspending the device that need interrupts to be
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* disabled
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*
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* @resume_noirq: Prepare for the execution of ->resume() by carrying out any
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* actions required for resuming the device that need interrupts to be
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* disabled
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*
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* @freeze_noirq: Complete the operations of ->freeze() by carrying out any
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* actions required for freezing the device that need interrupts to be
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* disabled
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*
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* @thaw_noirq: Prepare for the execution of ->thaw() by carrying out any
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* actions required for thawing the device that need interrupts to be
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* disabled
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*
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* @poweroff_noirq: Complete the operations of ->poweroff() by carrying out any
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* actions required for handling the device that need interrupts to be
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* disabled
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*
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* @restore_noirq: Prepare for the execution of ->restore() by carrying out any
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* actions required for restoring the operations of the device that need
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* interrupts to be disabled
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*
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* All of the above callbacks, except for @complete(), return error codes.
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* However, the error codes returned by the resume operations, @resume(),
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* @thaw(), @restore(), @resume_noirq(), @thaw_noirq(), and @restore_noirq() do
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* not cause the PM core to abort the resume transition during which they are
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* returned. The error codes returned in that cases are only printed by the PM
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* core to the system logs for debugging purposes. Still, it is recommended
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* that drivers only return error codes from their resume methods in case of an
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* unrecoverable failure (i.e. when the device being handled refuses to resume
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* and becomes unusable) to allow us to modify the PM core in the future, so
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* that it can avoid attempting to handle devices that failed to resume and
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* their children.
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*
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* It is allowed to unregister devices while the above callbacks are being
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* executed. However, it is not allowed to unregister a device from within any
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* of its own callbacks.
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*/
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struct dev_pm_ops {
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int (*prepare)(struct device *dev);
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void (*complete)(struct device *dev);
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int (*suspend)(struct device *dev);
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int (*resume)(struct device *dev);
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int (*freeze)(struct device *dev);
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int (*thaw)(struct device *dev);
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int (*poweroff)(struct device *dev);
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int (*restore)(struct device *dev);
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int (*suspend_noirq)(struct device *dev);
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int (*resume_noirq)(struct device *dev);
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int (*freeze_noirq)(struct device *dev);
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int (*thaw_noirq)(struct device *dev);
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int (*poweroff_noirq)(struct device *dev);
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int (*restore_noirq)(struct device *dev);
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};
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/**
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* PM_EVENT_ messages
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*
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* The following PM_EVENT_ messages are defined for the internal use of the PM
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* core, in order to provide a mechanism allowing the high level suspend and
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* hibernation code to convey the necessary information to the device PM core
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* code:
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*
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* ON No transition.
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*
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* FREEZE System is going to hibernate, call ->prepare() and ->freeze()
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* for all devices.
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*
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* SUSPEND System is going to suspend, call ->prepare() and ->suspend()
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* for all devices.
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*
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* HIBERNATE Hibernation image has been saved, call ->prepare() and
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* ->poweroff() for all devices.
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*
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* QUIESCE Contents of main memory are going to be restored from a (loaded)
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* hibernation image, call ->prepare() and ->freeze() for all
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* devices.
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*
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* RESUME System is resuming, call ->resume() and ->complete() for all
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* devices.
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*
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* THAW Hibernation image has been created, call ->thaw() and
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* ->complete() for all devices.
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*
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* RESTORE Contents of main memory have been restored from a hibernation
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* image, call ->restore() and ->complete() for all devices.
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*
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* RECOVER Creation of a hibernation image or restoration of the main
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* memory contents from a hibernation image has failed, call
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* ->thaw() and ->complete() for all devices.
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*
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* The following PM_EVENT_ messages are defined for internal use by
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* kernel subsystems. They are never issued by the PM core.
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*
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* USER_SUSPEND Manual selective suspend was issued by userspace.
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*
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* USER_RESUME Manual selective resume was issued by userspace.
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*
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* REMOTE_WAKEUP Remote-wakeup request was received from the device.
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*
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* AUTO_SUSPEND Automatic (device idle) runtime suspend was
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* initiated by the subsystem.
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*
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* AUTO_RESUME Automatic (device needed) runtime resume was
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* requested by a driver.
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*/
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#define PM_EVENT_ON 0x0000
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#define PM_EVENT_FREEZE 0x0001
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#define PM_EVENT_SUSPEND 0x0002
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#define PM_EVENT_HIBERNATE 0x0004
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#define PM_EVENT_QUIESCE 0x0008
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#define PM_EVENT_RESUME 0x0010
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#define PM_EVENT_THAW 0x0020
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#define PM_EVENT_RESTORE 0x0040
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#define PM_EVENT_RECOVER 0x0080
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#define PM_EVENT_USER 0x0100
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#define PM_EVENT_REMOTE 0x0200
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#define PM_EVENT_AUTO 0x0400
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#define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
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#define PM_EVENT_USER_SUSPEND (PM_EVENT_USER | PM_EVENT_SUSPEND)
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#define PM_EVENT_USER_RESUME (PM_EVENT_USER | PM_EVENT_RESUME)
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#define PM_EVENT_REMOTE_RESUME (PM_EVENT_REMOTE | PM_EVENT_RESUME)
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#define PM_EVENT_AUTO_SUSPEND (PM_EVENT_AUTO | PM_EVENT_SUSPEND)
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#define PM_EVENT_AUTO_RESUME (PM_EVENT_AUTO | PM_EVENT_RESUME)
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#define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
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#define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
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#define PMSG_QUIESCE ((struct pm_message){ .event = PM_EVENT_QUIESCE, })
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#define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
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#define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
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#define PMSG_RESUME ((struct pm_message){ .event = PM_EVENT_RESUME, })
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#define PMSG_THAW ((struct pm_message){ .event = PM_EVENT_THAW, })
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#define PMSG_RESTORE ((struct pm_message){ .event = PM_EVENT_RESTORE, })
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#define PMSG_RECOVER ((struct pm_message){ .event = PM_EVENT_RECOVER, })
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#define PMSG_USER_SUSPEND ((struct pm_message) \
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{ .event = PM_EVENT_USER_SUSPEND, })
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#define PMSG_USER_RESUME ((struct pm_message) \
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{ .event = PM_EVENT_USER_RESUME, })
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#define PMSG_REMOTE_RESUME ((struct pm_message) \
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{ .event = PM_EVENT_REMOTE_RESUME, })
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#define PMSG_AUTO_SUSPEND ((struct pm_message) \
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{ .event = PM_EVENT_AUTO_SUSPEND, })
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#define PMSG_AUTO_RESUME ((struct pm_message) \
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{ .event = PM_EVENT_AUTO_RESUME, })
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/**
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* Device power management states
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*
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* These state labels are used internally by the PM core to indicate the current
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* status of a device with respect to the PM core operations.
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*
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* DPM_ON Device is regarded as operational. Set this way
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* initially and when ->complete() is about to be called.
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* Also set when ->prepare() fails.
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*
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* DPM_PREPARING Device is going to be prepared for a PM transition. Set
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* when ->prepare() is about to be called.
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*
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* DPM_RESUMING Device is going to be resumed. Set when ->resume(),
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* ->thaw(), or ->restore() is about to be called.
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*
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* DPM_SUSPENDING Device has been prepared for a power transition. Set
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* when ->prepare() has just succeeded.
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*
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* DPM_OFF Device is regarded as inactive. Set immediately after
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* ->suspend(), ->freeze(), or ->poweroff() has succeeded.
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* Also set when ->resume()_noirq, ->thaw_noirq(), or
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* ->restore_noirq() is about to be called.
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*
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* DPM_OFF_IRQ Device is in a "deep sleep". Set immediately after
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* ->suspend_noirq(), ->freeze_noirq(), or
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* ->poweroff_noirq() has just succeeded.
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*/
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enum dpm_state {
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DPM_INVALID,
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DPM_ON,
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DPM_PREPARING,
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DPM_RESUMING,
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DPM_SUSPENDING,
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DPM_OFF,
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DPM_OFF_IRQ,
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};
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struct dev_pm_info {
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pm_message_t power_state;
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unsigned can_wakeup:1;
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unsigned should_wakeup:1;
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enum dpm_state status; /* Owned by the PM core */
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#ifdef CONFIG_PM_SLEEP
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struct list_head entry;
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#endif
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};
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/*
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* The PM_EVENT_ messages are also used by drivers implementing the legacy
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* suspend framework, based on the ->suspend() and ->resume() callbacks common
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* for suspend and hibernation transitions, according to the rules below.
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*/
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/* Necessary, because several drivers use PM_EVENT_PRETHAW */
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#define PM_EVENT_PRETHAW PM_EVENT_QUIESCE
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/*
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* One transition is triggered by resume(), after a suspend() call; the
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* message is implicit:
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*
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* ON Driver starts working again, responding to hardware events
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* and software requests. The hardware may have gone through
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* a power-off reset, or it may have maintained state from the
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* previous suspend() which the driver will rely on while
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* resuming. On most platforms, there are no restrictions on
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* availability of resources like clocks during resume().
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*
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* Other transitions are triggered by messages sent using suspend(). All
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* these transitions quiesce the driver, so that I/O queues are inactive.
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* That commonly entails turning off IRQs and DMA; there may be rules
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* about how to quiesce that are specific to the bus or the device's type.
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* (For example, network drivers mark the link state.) Other details may
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* differ according to the message:
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*
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* SUSPEND Quiesce, enter a low power device state appropriate for
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* the upcoming system state (such as PCI_D3hot), and enable
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* wakeup events as appropriate.
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*
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* HIBERNATE Enter a low power device state appropriate for the hibernation
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* state (eg. ACPI S4) and enable wakeup events as appropriate.
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*
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* FREEZE Quiesce operations so that a consistent image can be saved;
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* but do NOT otherwise enter a low power device state, and do
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* NOT emit system wakeup events.
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*
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* PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring
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* the system from a snapshot taken after an earlier FREEZE.
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* Some drivers will need to reset their hardware state instead
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* of preserving it, to ensure that it's never mistaken for the
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* state which that earlier snapshot had set up.
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*
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* A minimally power-aware driver treats all messages as SUSPEND, fully
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* reinitializes its device during resume() -- whether or not it was reset
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* during the suspend/resume cycle -- and can't issue wakeup events.
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*
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* More power-aware drivers may also use low power states at runtime as
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* well as during system sleep states like PM_SUSPEND_STANDBY. They may
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* be able to use wakeup events to exit from runtime low-power states,
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* or from system low-power states such as standby or suspend-to-RAM.
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*/
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#ifdef CONFIG_PM_SLEEP
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extern void device_pm_lock(void);
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extern int sysdev_resume(void);
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extern void dpm_resume_noirq(pm_message_t state);
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extern void dpm_resume_end(pm_message_t state);
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extern void device_pm_unlock(void);
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extern int sysdev_suspend(pm_message_t state);
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extern int dpm_suspend_noirq(pm_message_t state);
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extern int dpm_suspend_start(pm_message_t state);
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extern void __suspend_report_result(const char *function, void *fn, int ret);
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#define suspend_report_result(fn, ret) \
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do { \
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__suspend_report_result(__func__, fn, ret); \
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} while (0)
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#else /* !CONFIG_PM_SLEEP */
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#define device_pm_lock() do {} while (0)
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#define device_pm_unlock() do {} while (0)
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static inline int dpm_suspend_start(pm_message_t state)
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{
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return 0;
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}
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#define suspend_report_result(fn, ret) do {} while (0)
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#endif /* !CONFIG_PM_SLEEP */
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/* How to reorder dpm_list after device_move() */
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enum dpm_order {
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DPM_ORDER_NONE,
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DPM_ORDER_DEV_AFTER_PARENT,
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DPM_ORDER_PARENT_BEFORE_DEV,
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DPM_ORDER_DEV_LAST,
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};
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/*
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* Global Power Management flags
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* Used to keep APM and ACPI from both being active
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*/
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extern unsigned int pm_flags;
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#define PM_APM 1
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#define PM_ACPI 2
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#endif /* _LINUX_PM_H */
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