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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>
#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 -EINVAL.
*/
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 -EINVAL.
*/
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_call - Generic suspend/freeze/poweroff/thaw subsystem callback.
* @dev: Device to handle.
* @event: PM transition of the system under way.
*
* If the device has not been suspended at run time, execute the
* suspend/freeze/poweroff/thaw callback provided by its driver, if defined, and
* return its error code. Otherwise, return zero.
*/
static int __pm_generic_call(struct device *dev, int event)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int (*callback)(struct device *);
if (!pm || pm_runtime_suspended(dev))
return 0;
switch (event) {
case PM_EVENT_SUSPEND:
callback = pm->suspend;
break;
case PM_EVENT_FREEZE:
callback = pm->freeze;
break;
case PM_EVENT_HIBERNATE:
callback = pm->poweroff;
break;
case PM_EVENT_THAW:
callback = pm->thaw;
break;
default:
callback = NULL;
break;
}
return callback ? callback(dev) : 0;
}
/**
* 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);
}
EXPORT_SYMBOL_GPL(pm_generic_suspend);
/**
* 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);
}
EXPORT_SYMBOL_GPL(pm_generic_freeze);
/**
* 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);
}
EXPORT_SYMBOL_GPL(pm_generic_poweroff);
/**
* 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);
}
EXPORT_SYMBOL_GPL(pm_generic_thaw);
/**
* __pm_generic_resume - Generic resume/restore callback for subsystems.
* @dev: Device to handle.
* @event: PM transition of the system under way.
*
* Execute the resume/resotre callback provided by the @dev's driver, if
* defined. If it returns 0, change the device's runtime PM status to 'active'.
* Return the callback's error code.
*/
static int __pm_generic_resume(struct device *dev, int event)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int (*callback)(struct device *);
int ret;
if (!pm)
return 0;
switch (event) {
case PM_EVENT_RESUME:
callback = pm->resume;
break;
case PM_EVENT_RESTORE:
callback = pm->restore;
break;
default:
callback = NULL;
break;
}
if (!callback)
return 0;
ret = callback(dev);
if (!ret) {
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
}
return ret;
}
/**
* pm_generic_resume - Generic resume callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_resume(struct device *dev)
{
return __pm_generic_resume(dev, PM_EVENT_RESUME);
}
EXPORT_SYMBOL_GPL(pm_generic_resume);
/**
* pm_generic_restore - Generic restore callback for subsystems.
* @dev: Device to restore.
*/
int pm_generic_restore(struct device *dev)
{
return __pm_generic_resume(dev, PM_EVENT_RESTORE);
}
EXPORT_SYMBOL_GPL(pm_generic_restore);
#endif /* CONFIG_PM_SLEEP */
struct dev_pm_ops generic_subsys_pm_ops = {
#ifdef CONFIG_PM_SLEEP
.suspend = pm_generic_suspend,
.resume = pm_generic_resume,
.freeze = pm_generic_freeze,
.thaw = pm_generic_thaw,
.poweroff = pm_generic_poweroff,
.restore = pm_generic_restore,
#endif
#ifdef CONFIG_PM_RUNTIME
.runtime_suspend = pm_generic_runtime_suspend,
.runtime_resume = pm_generic_runtime_resume,
.runtime_idle = pm_generic_runtime_idle,
#endif
};
EXPORT_SYMBOL_GPL(generic_subsys_pm_ops);
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