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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-12-17 02:54:26 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-12-21 03:11:12 +0100 |
| commit | a436b6a19f57656a6557439523923d89eb4a880d (patch) | |
| tree | 62637a13b7721a775f8aa2af4554c9fc3069f595 /include/linux/pm_runtime.h | |
| parent | d89d7ff9edf58cbf8ad0f490694b2edea8eb3a39 (diff) | |
| download | linux-a436b6a19f57656a6557439523923d89eb4a880d.tar.gz | |
PM / runtime: Add new helper for conditional usage count incrementation
Introduce a new runtime PM function, pm_runtime_get_if_in_use(),
that will increment the device's runtime PM usage counter and
return 1 if its status is RPM_ACTIVE and its usage counter
is greater than 0 at the same time (0 will be returned otherwise).
This is useful for things that should only be done if the device
is active (from the runtime PM perspective) and used by somebody
(as indicated by the usage counter) already and they are not worth
bothering otherwise.
Requested-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/pm_runtime.h')
| -rw-r--r-- | include/linux/pm_runtime.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h index 3bdbb4189780..7af093d6a4dd 100644 --- a/include/linux/pm_runtime.h +++ b/include/linux/pm_runtime.h @@ -39,6 +39,7 @@ extern int pm_runtime_force_resume(struct device *dev); extern int __pm_runtime_idle(struct device *dev, int rpmflags); extern int __pm_runtime_suspend(struct device *dev, int rpmflags); extern int __pm_runtime_resume(struct device *dev, int rpmflags); +extern int pm_runtime_get_if_in_use(struct device *dev); extern int pm_schedule_suspend(struct device *dev, unsigned int delay); extern int __pm_runtime_set_status(struct device *dev, unsigned int status); extern int pm_runtime_barrier(struct device *dev); @@ -143,6 +144,10 @@ static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) { return -ENOSYS; } +static inline int pm_runtime_get_if_in_use(struct device *dev) +{ + return -EINVAL; +} static inline int __pm_runtime_set_status(struct device *dev, unsigned int status) { return 0; } static inline int pm_runtime_barrier(struct device *dev) { return 0; } |