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linux/drivers/base/power/generic_ops.c
Rafael J. Wysocki 90363ddf0a PM: Drop generic_subsys_pm_ops 
Since the PM core is now going to execute driver callbacks directly
if the corresponding subsystem callbacks are not present,
forward-only subsystem callbacks (i.e. such that only execute the
corresponding driver callbacks) are not necessary any more.  Thus
it is possible to remove generic_subsys_pm_ops, because the only
callback in there that is not forward-only, .runtime_idle, is not
really used by the only user of generic_subsys_pm_ops, which is
vio_bus_type.

However, the generic callback routines themselves cannot be removed
from generic_ops.c, because they are used individually by a number
of subsystems.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-12-21 22:03:32 +01:00

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/*
* drivers/base/power/generic_ops.c - Generic PM callbacks for subsystems
*
* Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
*
* This file is released under the GPLv2.
*/
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/export.h>
#ifdef CONFIG_PM_RUNTIME
/**
* pm_generic_runtime_idle - Generic runtime idle callback for subsystems.
* @dev: Device to handle.
*
* If PM operations are defined for the @dev's driver and they include
* ->runtime_idle(), execute it and return its error code, if nonzero.
* Otherwise, execute pm_runtime_suspend() for the device and return 0.
*/
int pm_generic_runtime_idle(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (pm && pm->runtime_idle) {
int ret = pm->runtime_idle(dev);
if (ret)
return ret;
}
pm_runtime_suspend(dev);
return 0;
}
EXPORT_SYMBOL_GPL(pm_generic_runtime_idle);
/**
* pm_generic_runtime_suspend - Generic runtime suspend callback for subsystems.
* @dev: Device to suspend.
*
* If PM operations are defined for the @dev's driver and they include
* ->runtime_suspend(), execute it and return its error code. Otherwise,
* return 0.
*/
int pm_generic_runtime_suspend(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int ret;
ret = pm && pm->runtime_suspend ? pm->runtime_suspend(dev) : 0;
return ret;
}
EXPORT_SYMBOL_GPL(pm_generic_runtime_suspend);
/**
* pm_generic_runtime_resume - Generic runtime resume callback for subsystems.
* @dev: Device to resume.
*
* If PM operations are defined for the @dev's driver and they include
* ->runtime_resume(), execute it and return its error code. Otherwise,
* return 0.
*/
int pm_generic_runtime_resume(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int ret;
ret = pm && pm->runtime_resume ? pm->runtime_resume(dev) : 0;
return ret;
}
EXPORT_SYMBOL_GPL(pm_generic_runtime_resume);
#endif /* CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM_SLEEP
/**
* pm_generic_prepare - Generic routine preparing a device for power transition.
* @dev: Device to prepare.
*
* Prepare a device for a system-wide power transition.
*/
int pm_generic_prepare(struct device *dev)
{
struct device_driver *drv = dev->driver;
int ret = 0;
if (drv && drv->pm && drv->pm->prepare)
ret = drv->pm->prepare(dev);
return ret;
}
/**
* __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback.
* @dev: Device to handle.
* @event: PM transition of the system under way.
* @bool: Whether or not this is the "noirq" stage.
*
* Execute the PM callback corresponding to @event provided by the driver of
* @dev, if defined, and return its error code. Return 0 if the callback is
* not present.
*/
static int __pm_generic_call(struct device *dev, int event, bool noirq)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int (*callback)(struct device *);
if (!pm)
return 0;
switch (event) {
case PM_EVENT_SUSPEND:
callback = noirq ? pm->suspend_noirq : pm->suspend;
break;
case PM_EVENT_FREEZE:
callback = noirq ? pm->freeze_noirq : pm->freeze;
break;
case PM_EVENT_HIBERNATE:
callback = noirq ? pm->poweroff_noirq : pm->poweroff;
break;
case PM_EVENT_RESUME:
callback = noirq ? pm->resume_noirq : pm->resume;
break;
case PM_EVENT_THAW:
callback = noirq ? pm->thaw_noirq : pm->thaw;
break;
case PM_EVENT_RESTORE:
callback = noirq ? pm->restore_noirq : pm->restore;
break;
default:
callback = NULL;
break;
}
return callback ? callback(dev) : 0;
}
/**
* pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems.
* @dev: Device to suspend.
*/
int pm_generic_suspend_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_SUSPEND, true);
}
EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq);
/**
* pm_generic_suspend - Generic suspend callback for subsystems.
* @dev: Device to suspend.
*/
int pm_generic_suspend(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_SUSPEND, false);
}
EXPORT_SYMBOL_GPL(pm_generic_suspend);
/**
* pm_generic_freeze_noirq - Generic freeze_noirq callback for subsystems.
* @dev: Device to freeze.
*/
int pm_generic_freeze_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_FREEZE, true);
}
EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq);
/**
* pm_generic_freeze - Generic freeze callback for subsystems.
* @dev: Device to freeze.
*/
int pm_generic_freeze(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_FREEZE, false);
}
EXPORT_SYMBOL_GPL(pm_generic_freeze);
/**
* pm_generic_poweroff_noirq - Generic poweroff_noirq callback for subsystems.
* @dev: Device to handle.
*/
int pm_generic_poweroff_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_HIBERNATE, true);
}
EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq);
/**
* pm_generic_poweroff - Generic poweroff callback for subsystems.
* @dev: Device to handle.
*/
int pm_generic_poweroff(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_HIBERNATE, false);
}
EXPORT_SYMBOL_GPL(pm_generic_poweroff);
/**
* pm_generic_thaw_noirq - Generic thaw_noirq callback for subsystems.
* @dev: Device to thaw.
*/
int pm_generic_thaw_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_THAW, true);
}
EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq);
/**
* pm_generic_thaw - Generic thaw callback for subsystems.
* @dev: Device to thaw.
*/
int pm_generic_thaw(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_THAW, false);
}
EXPORT_SYMBOL_GPL(pm_generic_thaw);
/**
* pm_generic_resume_noirq - Generic resume_noirq callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_resume_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_RESUME, true);
}
EXPORT_SYMBOL_GPL(pm_generic_resume_noirq);
/**
* pm_generic_resume - Generic resume callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_resume(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_RESUME, false);
}
EXPORT_SYMBOL_GPL(pm_generic_resume);
/**
* pm_generic_restore_noirq - Generic restore_noirq callback for subsystems.
* @dev: Device to restore.
*/
int pm_generic_restore_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_RESTORE, true);
}
EXPORT_SYMBOL_GPL(pm_generic_restore_noirq);
/**
* pm_generic_restore - Generic restore callback for subsystems.
* @dev: Device to restore.
*/
int pm_generic_restore(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_RESTORE, false);
}
EXPORT_SYMBOL_GPL(pm_generic_restore);
/**
* pm_generic_complete - Generic routine competing a device power transition.
* @dev: Device to handle.
*
* Complete a device power transition during a system-wide power transition.
*/
void pm_generic_complete(struct device *dev)
{
struct device_driver *drv = dev->driver;
if (drv && drv->pm && drv->pm->complete)
drv->pm->complete(dev);
/*
* Let runtime PM try to suspend devices that haven't been in use before
* going into the system-wide sleep state we're resuming from.
*/
pm_runtime_idle(dev);
}
#endif /* CONFIG_PM_SLEEP */
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