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PM: Run-time PM platform device bus support 

This patch adds default Runtime PM callbacks to the dev_pm_ops
belonging to the platform bus. The callbacks are weak symbols
that architecture specific code can override.

Allows Runtime PM even though CONFIG_PM_SLEEP=n.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Magnus Damm 2009-08-20 20:25:32 +02:00 committed by Rafael J. Wysocki
parent 5e928f77a0
commit 9d7302299e
1 changed files with 37 additions and 9 deletions
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46
drivers/base/platform.c
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@ -17,6 +17,7 @@
#include <linux/bootmem.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include "base.h"
@ -656,6 +657,13 @@ static void platform_pm_complete(struct device *dev)
drv->pm->complete(dev);
}
#else /* !CONFIG_PM_SLEEP */
#define platform_pm_prepare NULL
#define platform_pm_complete NULL
#endif /* !CONFIG_PM_SLEEP */
#ifdef CONFIG_SUSPEND
static int platform_pm_suspend(struct device *dev)
@ -886,6 +894,31 @@ static int platform_pm_restore_noirq(struct device *dev)
#endif /* !CONFIG_HIBERNATION */
#ifdef CONFIG_PM_RUNTIME
int __weak platform_pm_runtime_suspend(struct device *dev)
{
return -ENOSYS;
};
int __weak platform_pm_runtime_resume(struct device *dev)
{
return -ENOSYS;
};
int __weak platform_pm_runtime_idle(struct device *dev)
{
return -ENOSYS;
};
#else /* !CONFIG_PM_RUNTIME */
#define platform_pm_runtime_suspend NULL
#define platform_pm_runtime_resume NULL
#define platform_pm_runtime_idle NULL
#endif /* !CONFIG_PM_RUNTIME */
static const struct dev_pm_ops platform_dev_pm_ops = {
.prepare = platform_pm_prepare,
.complete = platform_pm_complete,
@ -901,22 +934,17 @@ static const struct dev_pm_ops platform_dev_pm_ops = {
.thaw_noirq = platform_pm_thaw_noirq,
.poweroff_noirq = platform_pm_poweroff_noirq,
.restore_noirq = platform_pm_restore_noirq,
.runtime_suspend = platform_pm_runtime_suspend,
.runtime_resume = platform_pm_runtime_resume,
.runtime_idle = platform_pm_runtime_idle,
};
#define PLATFORM_PM_OPS_PTR (&platform_dev_pm_ops)
#else /* !CONFIG_PM_SLEEP */
#define PLATFORM_PM_OPS_PTR NULL
#endif /* !CONFIG_PM_SLEEP */
struct bus_type platform_bus_type = {
.name = "platform",
.dev_attrs = platform_dev_attrs,
.match = platform_match,
.uevent = platform_uevent,
.pm = PLATFORM_PM_OPS_PTR,
.pm = &platform_dev_pm_ops,
};
EXPORT_SYMBOL_GPL(platform_bus_type);