791 lines
32 KiB
C
791 lines
32 KiB
C
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/*
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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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#include <linux/workqueue.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include <linux/timer.h>
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#include <linux/completion.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_power_off)(void);
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extern void (*pm_power_off_prepare)(void);
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extern void (*pm_power_reset)(void);
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struct device; /* we have a circular dep with device.h */
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#ifdef CONFIG_VT_CONSOLE_SLEEP
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extern void pm_vt_switch_required(struct device *dev, bool required);
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extern void pm_vt_switch_unregister(struct device *dev);
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#else
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static inline void pm_vt_switch_required(struct device *dev, bool required)
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{
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}
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static inline void pm_vt_switch_unregister(struct device *dev)
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{
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}
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#endif /* CONFIG_VT_CONSOLE_SLEEP */
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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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#ifdef CONFIG_PM
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extern const char power_group_name[]; /* = "power" */
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#else
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#define power_group_name NULL
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#endif
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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 device 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 callbacks
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* included in this structure in such a way that two levels of callbacks are
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* involved. First, the PM core executes callbacks provided by PM domains,
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* device types, classes and bus types. They are the subsystem-level callbacks
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* supposed to execute callbacks provided by device drivers, although they may
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* choose not to do that. If the driver callbacks are executed, they have to
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* collaborate with the subsystem-level callbacks to achieve the goals
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* appropriate for the given system transition, given transition phase and the
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* subsystem the device belongs to.
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*
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* @prepare: The principal role of this callback is to prevent new children of
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* the device from being registered after it has returned (the driver's
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* subsystem and generally the rest of the kernel is supposed to prevent
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* new calls to the probe method from being made too once @prepare() has
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* succeeded). If @prepare() detects a situation it cannot handle (e.g.
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* registration of a child already in progress), it may return -EAGAIN, so
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* that the PM core can execute it once again (e.g. after a new child has
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* been registered) to recover from the race condition.
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* This method is executed for all kinds of suspend transitions and is
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* followed by one of the suspend callbacks: @suspend(), @freeze(), or
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* @poweroff(). If the transition is a suspend to memory or standby (that
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* is, not related to hibernation), the return value of @prepare() may be
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* used to indicate to the PM core to leave the device in runtime suspend
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* if applicable. Namely, if @prepare() returns a positive number, the PM
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* core will understand that as a declaration that the device appears to be
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* runtime-suspended and it may be left in that state during the entire
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* transition and during the subsequent resume if all of its descendants
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* are left in runtime suspend too. If that happens, @complete() will be
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* executed directly after @prepare() and it must ensure the proper
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* functioning of the device after the system resume.
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* The PM core executes subsystem-level @prepare() for all devices before
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* starting to invoke suspend callbacks for any of them, so generally
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* devices may be assumed to be functional or to respond to runtime resume
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* requests while @prepare() is being executed. However, device drivers
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* may NOT assume anything about the availability of user space at that
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* time and it is NOT valid to request firmware from within @prepare()
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* (it's too late to do that). It also is NOT valid to allocate
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* substantial amounts of memory from @prepare() in the GFP_KERNEL mode.
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* [To work around these limitations, drivers may register suspend and
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* hibernation notifiers to be executed before the 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() or
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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 subsystem-level @complete() after it has executed
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* the appropriate resume callbacks for all devices. If the corresponding
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* @prepare() at the beginning of the suspend transition returned a
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* positive number and the device was left in runtime suspend (without
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* executing any suspend and resume callbacks for it), @complete() will be
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* the only callback executed for the device during resume. In that case,
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* @complete() must be prepared to do whatever is necessary to ensure the
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* proper functioning of the device after the system resume. To this end,
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* @complete() can check the power.direct_complete flag of the device to
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* learn whether (unset) or not (set) the previous suspend and resume
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* callbacks have been executed for it.
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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. The exact action to perform
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* depends on the device's subsystem (PM domain, device type, class or bus
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* type), but generally the device must be quiescent after subsystem-level
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* @suspend() has returned, so that it doesn't do any I/O or DMA.
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* Subsystem-level @suspend() is executed for all devices after invoking
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* subsystem-level @prepare() for all of them.
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*
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* @suspend_late: Continue operations started by @suspend(). For a number of
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* devices @suspend_late() may point to the same callback routine as the
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* runtime suspend callback.
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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. The exact action to perform
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* depends on the device's subsystem, but generally the driver is expected
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* to start working again, responding to hardware events and software
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* requests (the device itself may be left in a low-power state, waiting
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* for a runtime resume to occur). The state of the device at the time its
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* driver's @resume() callback is run depends on the platform and subsystem
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* the device belongs to. On most platforms, there are no restrictions on
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* availability of resources like clocks during @resume().
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* Subsystem-level @resume() is executed for all devices after invoking
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* subsystem-level @resume_noirq() for all of them.
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*
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* @resume_early: Prepare to execute @resume(). For a number of devices
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* @resume_early() may point to the same callback routine as the runtime
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* resume callback.
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*
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* @freeze: Hibernation-specific, executed before creating a hibernation image.
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* Analogous to @suspend(), but it should not enable the device to signal
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* wakeup events or change its power state. The majority of subsystems
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* (with the notable exception of the PCI bus type) expect the driver-level
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* @freeze() to save the device settings in memory to be used by @restore()
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* during the subsequent resume from hibernation.
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* Subsystem-level @freeze() is executed for all devices after invoking
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* subsystem-level @prepare() for all of them.
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*
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* @freeze_late: Continue operations started by @freeze(). Analogous to
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* @suspend_late(), but it should not enable the device to signal wakeup
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* events or change its power state.
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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 an image has failed. 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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* Subsystem-level @thaw() is executed for all devices after invoking
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* subsystem-level @thaw_noirq() for all of them. It also may be executed
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* directly after @freeze() in case of a transition error.
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*
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* @thaw_early: Prepare to execute @thaw(). Undo the changes made by the
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* preceding @freeze_late().
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*
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* @poweroff: Hibernation-specific, executed after saving a hibernation image.
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* Analogous to @suspend(), but it need not save the device's settings in
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* memory.
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* Subsystem-level @poweroff() is executed for all devices after invoking
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* subsystem-level @prepare() for all of them.
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*
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* @poweroff_late: Continue operations started by @poweroff(). Analogous to
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* @suspend_late(), but it need not save the device's settings in memory.
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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, analogous to @resume().
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*
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* @restore_early: Prepare to execute @restore(), analogous to @resume_early().
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*
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* @suspend_noirq: Complete the actions started by @suspend(). Carry out any
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* additional operations required for suspending the device that might be
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* racing with its driver's interrupt handler, which is guaranteed not to
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* run while @suspend_noirq() is being executed.
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* It generally is expected that the device will be in a low-power state
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* (appropriate for the target system sleep state) after subsystem-level
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* @suspend_noirq() has returned successfully. If the device can generate
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* system wakeup signals and is enabled to wake up the system, it should be
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* configured to do so at that time. However, depending on the platform
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* and device's subsystem, @suspend() or @suspend_late() may be allowed to
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* put the device into the low-power state and configure it to generate
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* wakeup signals, in which case it generally is not necessary to define
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* @suspend_noirq().
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*
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* @resume_noirq: Prepare for the execution of @resume() by carrying out any
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* operations required for resuming the device that might be racing with
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* its driver's interrupt handler, which is guaranteed not to run while
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* @resume_noirq() is being executed.
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*
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* @freeze_noirq: Complete the actions started by @freeze(). Carry out any
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* additional operations required for freezing the device that might be
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* racing with its driver's interrupt handler, which is guaranteed not to
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* run while @freeze_noirq() is being executed.
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* The power state of the device should not be changed by either @freeze(),
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* or @freeze_late(), or @freeze_noirq() and it should not be configured to
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* signal system wakeup by any of these callbacks.
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*
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* @thaw_noirq: Prepare for the execution of @thaw() by carrying out any
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* operations required for thawing the device that might be racing with its
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* driver's interrupt handler, which is guaranteed not to run while
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* @thaw_noirq() is being executed.
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*
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* @poweroff_noirq: Complete the actions started by @poweroff(). Analogous to
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* @suspend_noirq(), but it need not save the device's settings in memory.
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*
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* @restore_noirq: Prepare for the execution of @restore() by carrying out any
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* operations required for thawing the device that might be racing with its
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* driver's interrupt handler, which is guaranteed not to run while
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* @restore_noirq() is being executed. Analogous to @resume_noirq().
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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 those 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, a callback routine must NOT try to unregister the device
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* it was called for, although it may unregister children of that device (for
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* example, if it detects that a child was unplugged while the system was
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* asleep).
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*
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* Refer to Documentation/power/devices.txt for more information about the role
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* of the above callbacks in the system suspend process.
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*
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* There also are callbacks related to runtime power management of devices.
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* Again, these callbacks are executed by the PM core only for subsystems
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* (PM domains, device types, classes and bus types) and the subsystem-level
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* callbacks are supposed to invoke the driver callbacks. Moreover, the exact
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* actions to be performed by a device driver's callbacks generally depend on
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* the platform and subsystem the device belongs to.
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*
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* @runtime_suspend: Prepare the device for a condition in which it won't be
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* able to communicate with the CPU(s) and RAM due to power management.
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* This need not mean that the device should be put into a low-power state.
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* For example, if the device is behind a link which is about to be turned
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* off, the device may remain at full power. If the device does go to low
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* power and is capable of generating runtime wakeup events, remote wakeup
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* (i.e., a hardware mechanism allowing the device to request a change of
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* its power state via an interrupt) should be enabled for it.
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*
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* @runtime_resume: Put the device into the fully active state in response to a
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* wakeup event generated by hardware or at the request of software. If
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* necessary, put the device into the full-power state and restore its
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* registers, so that it is fully operational.
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*
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* @runtime_idle: Device appears to be inactive and it might be put into a
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* low-power state if all of the necessary conditions are satisfied.
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* Check these conditions, and return 0 if it's appropriate to let the PM
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* core queue a suspend request for the device.
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*
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* Refer to Documentation/power/runtime_pm.txt for more information about the
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* role of the above callbacks in device runtime power management.
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*
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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_late)(struct device *dev);
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int (*resume_early)(struct device *dev);
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int (*freeze_late)(struct device *dev);
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int (*thaw_early)(struct device *dev);
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int (*poweroff_late)(struct device *dev);
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int (*restore_early)(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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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_SLEEP
|
||
|
|
#define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
|
||
|
|
.suspend_late = suspend_fn, \
|
||
|
|
.resume_early = resume_fn, \
|
||
|
|
.freeze_late = suspend_fn, \
|
||
|
|
.thaw_early = resume_fn, \
|
||
|
|
.poweroff_late = suspend_fn, \
|
||
|
|
.restore_early = resume_fn,
|
||
|
|
#else
|
||
|
|
#define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM_SLEEP
|
||
|
|
#define SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
|
||
|
|
.suspend_noirq = suspend_fn, \
|
||
|
|
.resume_noirq = resume_fn, \
|
||
|
|
.freeze_noirq = suspend_fn, \
|
||
|
|
.thaw_noirq = resume_fn, \
|
||
|
|
.poweroff_noirq = suspend_fn, \
|
||
|
|
.restore_noirq = resume_fn,
|
||
|
|
#else
|
||
|
|
#define SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM
|
||
|
|
#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
|
||
|
|
* (system suspend, hibernation or runtime PM).
|
||
|
|
* NOTE: In general, system suspend callbacks, .suspend() and .resume(), should
|
||
|
|
* be different from the corresponding runtime PM callbacks, .runtime_suspend(),
|
||
|
|
* and .runtime_resume(), because .runtime_suspend() always works on an already
|
||
|
|
* quiescent device, while .suspend() should assume that the device may be doing
|
||
|
|
* something when it is called (it should ensure that the device will be
|
||
|
|
* quiescent after it has returned). Therefore it's better to point the "late"
|
||
|
|
* suspend and "early" resume callback pointers, .suspend_late() and
|
||
|
|
* .resume_early(), to the same routines as .runtime_suspend() and
|
||
|
|
* .runtime_resume(), respectively (and analogously for hibernation).
|
||
|
|
*/
|
||
|
|
#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) \
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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_INVALID (-1)
|
||
|
|
#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_INVALID ((struct pm_message){ .event = PM_EVENT_INVALID, })
|
||
|
|
#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, })
|
||
|
|
|
||
|
|
#define PMSG_IS_AUTO(msg) (((msg).event & PM_EVENT_AUTO) != 0)
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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_AUTOSUSPEND Same as RPM_REQ_SUSPEND, but not until the device has
|
||
|
|
* been inactive for as long as power.autosuspend_delay
|
||
|
|
*
|
||
|
|
* 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_AUTOSUSPEND,
|
||
|
|
RPM_REQ_RESUME,
|
||
|
|
};
|
||
|
|
|
||
|
|
struct wakeup_source;
|
||
|
|
struct wake_irq;
|
||
|
|
struct pm_domain_data;
|
||
|
|
|
||
|
|
struct pm_subsys_data {
|
||
|
|
spinlock_t lock;
|
||
|
|
unsigned int refcount;
|
||
|
|
#ifdef CONFIG_PM_CLK
|
||
|
|
struct list_head clock_list;
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_PM_GENERIC_DOMAINS
|
||
|
|
struct pm_domain_data *domain_data;
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
struct dev_pm_info {
|
||
|
|
pm_message_t power_state;
|
||
|
|
unsigned int can_wakeup:1;
|
||
|
|
unsigned int async_suspend:1;
|
||
|
|
bool is_prepared:1; /* Owned by the PM core */
|
||
|
|
bool is_suspended:1; /* Ditto */
|
||
|
|
bool is_noirq_suspended:1;
|
||
|
|
bool is_late_suspended:1;
|
||
|
|
bool early_init:1; /* Owned by the PM core */
|
||
|
|
bool direct_complete:1; /* Owned by the PM core */
|
||
|
|
spinlock_t lock;
|
||
|
|
#ifdef CONFIG_PM_SLEEP
|
||
|
|
struct list_head entry;
|
||
|
|
struct completion completion;
|
||
|
|
struct wakeup_source *wakeup;
|
||
|
|
bool wakeup_path:1;
|
||
|
|
bool syscore:1;
|
||
|
|
bool no_pm_callbacks:1; /* Owned by the PM core */
|
||
|
|
#else
|
||
|
|
unsigned int should_wakeup:1;
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_PM
|
||
|
|
struct timer_list suspend_timer;
|
||
|
|
unsigned long timer_expires;
|
||
|
|
struct work_struct work;
|
||
|
|
wait_queue_head_t wait_queue;
|
||
|
|
struct wake_irq *wakeirq;
|
||
|
|
atomic_t usage_count;
|
||
|
|
atomic_t child_count;
|
||
|
|
unsigned int disable_depth:3;
|
||
|
|
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;
|
||
|
|
bool ignore_children:1;
|
||
|
|
unsigned int no_callbacks:1;
|
||
|
|
unsigned int irq_safe:1;
|
||
|
|
unsigned int use_autosuspend:1;
|
||
|
|
unsigned int timer_autosuspends:1;
|
||
|
|
unsigned int memalloc_noio:1;
|
||
|
|
enum rpm_request request;
|
||
|
|
enum rpm_status runtime_status;
|
||
|
|
int runtime_error;
|
||
|
|
int autosuspend_delay;
|
||
|
|
unsigned long last_busy;
|
||
|
|
unsigned long active_jiffies;
|
||
|
|
unsigned long suspended_jiffies;
|
||
|
|
unsigned long accounting_timestamp;
|
||
|
|
#endif
|
||
|
|
struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */
|
||
|
|
void (*set_latency_tolerance)(struct device *, s32);
|
||
|
|
struct dev_pm_qos *qos;
|
||
|
|
};
|
||
|
|
|
||
|
|
extern void update_pm_runtime_accounting(struct device *dev);
|
||
|
|
extern int dev_pm_get_subsys_data(struct device *dev);
|
||
|
|
extern void dev_pm_put_subsys_data(struct device *dev);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Power domains provide callbacks that are executed during system suspend,
|
||
|
|
* hibernation, system resume and during runtime PM transitions along with
|
||
|
|
* subsystem-level and driver-level callbacks.
|
||
|
|
*
|
||
|
|
* @detach: Called when removing a device from the domain.
|
||
|
|
* @activate: Called before executing probe routines for bus types and drivers.
|
||
|
|
* @sync: Called after successful driver probe.
|
||
|
|
* @dismiss: Called after unsuccessful driver probe and after driver removal.
|
||
|
|
*/
|
||
|
|
struct dev_pm_domain {
|
||
|
|
struct dev_pm_ops ops;
|
||
|
|
void (*detach)(struct device *dev, bool power_off);
|
||
|
|
int (*activate)(struct device *dev);
|
||
|
|
void (*sync)(struct device *dev);
|
||
|
|
void (*dismiss)(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 void dpm_resume_start(pm_message_t state);
|
||
|
|
extern void dpm_resume_end(pm_message_t state);
|
||
|
|
extern void dpm_resume_noirq(pm_message_t state);
|
||
|
|
extern void dpm_resume_early(pm_message_t state);
|
||
|
|
extern void dpm_resume(pm_message_t state);
|
||
|
|
extern void dpm_complete(pm_message_t state);
|
||
|
|
|
||
|
|
extern void device_pm_unlock(void);
|
||
|
|
extern int dpm_suspend_end(pm_message_t state);
|
||
|
|
extern int dpm_suspend_start(pm_message_t state);
|
||
|
|
extern int dpm_suspend_noirq(pm_message_t state);
|
||
|
|
extern int dpm_suspend_late(pm_message_t state);
|
||
|
|
extern int dpm_suspend(pm_message_t state);
|
||
|
|
extern int dpm_prepare(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 int device_pm_wait_for_dev(struct device *sub, struct device *dev);
|
||
|
|
extern void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *));
|
||
|
|
|
||
|
|
extern int pm_generic_prepare(struct device *dev);
|
||
|
|
extern int pm_generic_suspend_late(struct device *dev);
|
||
|
|
extern int pm_generic_suspend_noirq(struct device *dev);
|
||
|
|
extern int pm_generic_suspend(struct device *dev);
|
||
|
|
extern int pm_generic_resume_early(struct device *dev);
|
||
|
|
extern int pm_generic_resume_noirq(struct device *dev);
|
||
|
|
extern int pm_generic_resume(struct device *dev);
|
||
|
|
extern int pm_generic_freeze_noirq(struct device *dev);
|
||
|
|
extern int pm_generic_freeze_late(struct device *dev);
|
||
|
|
extern int pm_generic_freeze(struct device *dev);
|
||
|
|
extern int pm_generic_thaw_noirq(struct device *dev);
|
||
|
|
extern int pm_generic_thaw_early(struct device *dev);
|
||
|
|
extern int pm_generic_thaw(struct device *dev);
|
||
|
|
extern int pm_generic_restore_noirq(struct device *dev);
|
||
|
|
extern int pm_generic_restore_early(struct device *dev);
|
||
|
|
extern int pm_generic_restore(struct device *dev);
|
||
|
|
extern int pm_generic_poweroff_noirq(struct device *dev);
|
||
|
|
extern int pm_generic_poweroff_late(struct device *dev);
|
||
|
|
extern int pm_generic_poweroff(struct device *dev);
|
||
|
|
extern void pm_generic_complete(struct device *dev);
|
||
|
|
extern void pm_complete_with_resume_check(struct device *dev);
|
||
|
|
|
||
|
|
#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 int device_pm_wait_for_dev(struct device *a, struct device *b)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
#define pm_generic_prepare NULL
|
||
|
|
#define pm_generic_suspend_late NULL
|
||
|
|
#define pm_generic_suspend_noirq NULL
|
||
|
|
#define pm_generic_suspend NULL
|
||
|
|
#define pm_generic_resume_early NULL
|
||
|
|
#define pm_generic_resume_noirq NULL
|
||
|
|
#define pm_generic_resume NULL
|
||
|
|
#define pm_generic_freeze_noirq NULL
|
||
|
|
#define pm_generic_freeze_late NULL
|
||
|
|
#define pm_generic_freeze NULL
|
||
|
|
#define pm_generic_thaw_noirq NULL
|
||
|
|
#define pm_generic_thaw_early NULL
|
||
|
|
#define pm_generic_thaw NULL
|
||
|
|
#define pm_generic_restore_noirq NULL
|
||
|
|
#define pm_generic_restore_early NULL
|
||
|
|
#define pm_generic_restore NULL
|
||
|
|
#define pm_generic_poweroff_noirq NULL
|
||
|
|
#define pm_generic_poweroff_late NULL
|
||
|
|
#define pm_generic_poweroff NULL
|
||
|
|
#define pm_generic_complete NULL
|
||
|
|
#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,
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* _LINUX_PM_H */
|