Power Management Framework

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Power Management Framework :

Kernel Power API

Sr.No API Note Example Use Case
1 int pm_runtime_get_sync(struct device *dev) Dont suspend device till I am done with some transaction. - -
2 pm_runtime_put_autosuspend(struct device *dev) Suspend the Device # http://lxr.free-electrons.com/source/drivers/spi/spi.c#L1163 Use to Start suspend operation per device
3 int pm_request_autosuspend(struct device *dev) schedule the execution of the subsystem-level suspend callback for the device when the autosuspend delay has expired; if the delay has already expired then the work item is queued up immediately https://android.googlesource.com/kernel/msm.git/+/android-msm-bullhead-3.10-n-preview-1/drivers/net/wireless/cnss/cnss_pci.c?autodive=0%2F%2F%2F%2F%2F#1460 Use to add runtime idle callback support
4 - - - -
5 - - - -

Reference Link :

 http://events.linuxfoundation.org/sites/events/files/slides/Intro_Kernel_PM.pdf
 https://events.linuxfoundation.org/slides/2011/linuxcon-japan/lcj2011_wysocki.pdf
 https://www.youtube.com/watch?v=Um0oRanCtzY
 https://events.linuxfoundation.org/images/stories/pdf/lcjp2012_linming.pdf